Load system and load test device

Abstract

A load system and the like are provided, which enable an operator at a remote location to grasp the state of a load test device or to operate the load test device. The load system includes: a first load test device; and a communication terminal (69) for wirelessly communicating with the first load test device. The first load test device has a first communication unit for wirelessly communicating with the communication terminal (69). The first communication unit sends information related to the on / off state of the first load test device to the communication terminal (69), and receives a signal related to an instruction to operate the first load test device from the communication terminal (69).

Description

[0001] This application is a divisional application of the invention patent application with application number 201780090849.4, application date May 16, 2017, and invention name “Load system, load test device and communication terminal”. Technical Field

[0002] The present invention relates to a load system and the like. Background Art

[0003] Conventionally, there is known a dry type load test device for performing a load test on a generator as described in Patent Document 1.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2010-25752 Summary of the invention

[0005] However, an operator who is located at a remote location from the load test device cannot understand the state of the load test device and cannot operate it.

[0006] Therefore, an object of the present invention is to provide a load system or the like that enables an operator at a remote location to grasp the state of a load test device or to operate the load test device.

[0007] The load system of the present invention includes: a first load test device; and a communication terminal for wirelessly communicating with the first load test device, the first load test device having a first communication unit for wirelessly communicating with the communication terminal, the first communication unit sending information related to the on / off state of the first load test device to the communication terminal, and receiving signals related to instructions for operating the first load test device from the communication terminal.

[0008] By using the communication terminal that communicates with the load test device, an operator who is located at a remote location from the load test device can grasp the state of the load test device and operate it.

[0009] Preferably, software for displaying an on-off status display pattern is installed in the communication terminal, and the on-off status display pattern includes: a relay on-off status display area, used to indicate the on-off status of the relay in the first load test device; and a load test status display area, used to indicate the status of the load test of the first load test device, and the on-off status of the relay in the first load test device is switched in accordance with the operation of the relay on-off status display area.

[0010] Further preferably, the first load testing device includes a first resistance unit, the first resistance unit is provided with a plurality of resistor groups having resistors, and when the communication between the first communication unit and the communication terminal is cut off, among the relays in the first load testing device corresponding to the plurality of resistor groups of the first resistance unit, at least one of the relays in the on state is changed to the off state.

[0011] When the communication between the communication unit and the communication terminal is disconnected, the load state of the load test device cannot be controlled by operating the communication terminal. However, the load is reduced due to the disconnection of the communication, and the safety of the load test device can be ensured.

[0012] Preferably, the first load testing device includes a first resistance unit, the first resistance unit is provided with a plurality of resistor groups having resistors, and when the communication between the first communication unit and the communication terminal is cut off, among the relays in the first load testing device corresponding to the plurality of resistor groups of the first resistance unit, some of the relays in the on state are gradually changed to the off state.

[0013] Further preferably, if the communication is restored after the communication is cut off and before all the relays corresponding to the multiple resistor groups of the first load testing device are in the disconnected state, the control of gradually changing to the disconnected state is stopped and the communication terminal displays information related to the restoration of the communication.

[0014] The load system of the present invention includes: a first load test device; a second load test device separate from the first load test device; and a communication terminal for wirelessly communicating with the first load test device and the second load test device, the first load test device having a first communication unit for wirelessly communicating with the communication terminal, the second load test device having a second communication unit for wirelessly communicating with the communication terminal, the first communication unit sending information related to the on / off state of the first load test device to the communication terminal, and receiving signals related to instructions for operating the first load test device from the communication terminal, the second communication unit sending information related to the on / off state of the second load test device to the communication terminal, and receiving signals related to instructions for operating the second load test device from the communication terminal.

[0015] The communication terminal communicates with the plurality of load test devices 1 and operates the plurality of load test devices, whereby the states of the plurality of load test devices can be simultaneously displayed on a single communication terminal, and a single operator can operate the plurality of load test devices.

[0016] This is particularly effective when a plurality of load test devices 1 are provided to perform a load test on an air conditioning system.

[0017] Preferably, software for displaying a first on / off status display pattern and a second on / off status display pattern is installed in the communication terminal, the first on / off status display pattern comprising: a first relay on / off status display area for indicating the on / off status of a relay in the first load test device; and a first load test status display area for indicating the status of a load test of the first load test device, the second on / off status display pattern comprising: a second relay on / off status display area for indicating the on / off status of a relay in the second load test device; and a second load test status display area for indicating the status of a load test of the second load test device, the first load test device is operated in accordance with the operation of the first relay on / off status display area The on-off state of the relay is switched, and the on-off state of the relay in the second load test device is switched corresponding to the operation of the on-off state display area of ​​the second relay. The state of the load test of the first load test device includes at least one of the information related to current, information related to voltage, information related to power, information related to load amount, information related to test time, and information related to normal operation in the load test of the first load test device. The state of the load test of the second load test device includes at least one of the information related to current, information related to voltage, information related to power, information related to load amount, information related to test time, and information related to normal operation in the load test of the second load test device.

[0018] Further preferably, the first load testing device includes a first resistor unit, the first resistor unit is provided with a plurality of resistor groups having resistors, and the second load testing device includes a second resistor unit, the second resistor unit is provided with a plurality of resistor groups having resistors, and when the communication between the first communication unit and the communication terminal is cut off, among the relays in the first load testing device corresponding to the plurality of resistor groups of the first resistor unit, at least one of the relays in the on state is changed to an off state, and when the communication between the second communication unit and the communication terminal is cut off, among the relays in the second load testing device corresponding to the plurality of resistor groups of the second resistor unit, at least one of the relays in the on state is changed to an off state.

[0019] Preferably, the software is also used to display a historical display pattern, which includes: an ongoing display area, indicating the status of the load test of the first load testing device and the status of the load test of the second load testing device; and a past display area, indicating the contents of past load tests of the first load testing device and the second load testing device, the contents of the past load tests in the past display area include information related to the date and time of the past load tests, and when the area indicating the status of the load test of the first load testing device in the ongoing display area is operated, it switches to display the first on-off state display pattern, and when the area indicating the status of the load test of the second load testing device in the ongoing display area is operated, it switches to display the second on-off state display pattern.

[0020] The load test device of the present invention includes a first communication unit for wirelessly communicating with a communication terminal, wherein the first communication unit sends information related to the on / off status of the first load test device to the communication terminal, and receives signals related to instructions for operating the first load test device from the communication terminal.

[0021] The communication terminal of the present invention is used for wireless communication with a first load test device, and the first load test device includes a first communication unit for wireless communication with the communication terminal. The communication terminal receives information related to the on and off status of the first load test device from the first communication unit, and sends signals related to instructions for operating the first load test device to the first communication unit.

[0022] According to the present invention, it is possible to provide a load system or the like that enables an operator at a remote location to grasp the state of a load test device or to operate the load test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a perspective view of the load test device according to the present embodiment before a protective cover and the like are attached.

[0024] Figure 2 : is a schematic diagram showing the structure of the load test device.

[0025] Figure 3 This is a perspective view of the operating unit.

[0026] Figure 4 This is a perspective view of the load test device before the first load test protection cover and the like are installed.

[0027] Figure 5 It is a perspective view of the load test device after the first load test protection cover and the like are installed.

[0028] Figure 6 is a perspective view of a load test device installed in a server rack.

[0029] Figure 7 This is a perspective view of the load test device before the second load test protection cover and the like are installed.

[0030] Figure 8 It is a perspective view of the load test device after the second load test protection cover and the like are installed.

[0031] Fig. 9 This is a perspective view of the load test device after the second load test protection cover is installed, and casters are installed instead of Figure 8 handle.

[0032] Fig.10 is a schematic diagram showing the structure of a load system.

[0033] Fig.11 FIG. 1 is a diagram showing an example of an on / off state display pattern displayed on a display device of a communication terminal.

[0034] Fig.12 2 is a diagram showing an example of a history display pattern displayed on a display device of a communication terminal.

[0035] Fig.13 1 is a diagram showing an example of an on / off state display pattern in which a use mode switching button area is added.

[0036] Fig.14 It is a diagram showing an example of a warning display pattern displayed on the display device of the communication terminal.

[0037] Fig.15 2 is a diagram showing an example of a communication resumption display pattern displayed on a display device of a communication terminal.

[0038] Fig.16 : is a flowchart showing an example of a procedure of gradual disconnection control based on communication cutoff. DETAILED DESCRIPTION

[0039] The present embodiment is described below using the accompanying drawings. The dry load test device 1 of the present embodiment includes a housing 10, a resistor unit 20, a cooling unit 30, a connection switching unit 40, and a setting member 50 ( Figures 1 to 9 ).

[0040] For the purpose of explaining directions, the direction in which the resistor Re of the resistor unit 20 extends is the x direction, the direction perpendicular to the x direction and in which the resistor unit 20 and the cooling unit 30 are arranged is the y direction, and the direction perpendicular to the x and y directions is the z direction.

[0041] In the first embodiment (as a first load test of a load test of an air conditioning device for cooling a computer server, refer to Figures 1 to 6 ), the x and y directions are horizontal directions, and the z direction is the vertical direction.

[0042] In the second embodiment (a second load test as a load test of a generator or a battery, refer to Figures 1 to 3 , 7 to 9), the x direction and the z direction are horizontal directions, and the y direction is the vertical direction.

[0043] The outer shape of the shell 10 is formed into a rectangular shape, in which one of the yz planes perpendicular to the x direction in the rectangular block is a first side surface 10a, and the other is a second side surface 10b, in which one of the xy planes perpendicular to the z direction in the rectangular block is an upper surface 10c, and the other is a lower surface 10d, in which one of the xz planes perpendicular to the y direction in the rectangular block is a front surface 10e, and the other is a rear surface 10f, the side close to the front surface 10e is the first area 11, and the side close to the rear surface 10f is the second area 12.

[0044] In the first embodiment, the lower surface 10 d is the bottom surface, and in the second embodiment, the front surface 10 e is the bottom surface.

[0045] The housing 10 accommodates the cooling unit 30 in the first region 11 and accommodates the resistor unit 20 in the second region 12 .

[0046] A first terminal connecting portion 41 , a second terminal connecting portion 42 , and a relay portion 45 are provided on the first side surface 10 a and the second side surface 10 b in the first region 11 of the housing 10 .

[0047] In particular, the first terminal connection portion 41 and the second terminal connection portion 42 are provided on the front surface 10 e side relative to a mounting position of a rack mounting bracket 51 to be described later.

[0048] The operation portion 47 is detachably mounted on the front surface 10 e of the housing 10 or the upper surface 10 c of the first region 11 of the housing 10 .

[0049] A resistor Re constituting a resistance portion 20, cables or short-circuit bars connected to terminals of the resistor Re, and a cover 13 (first side surface cover 13a, second side surface cover 13b, upper surface cover 13c, lower surface cover 13d) for protecting a retaining plate 21 retaining the resistor Re are provided on the first side surface 10a, the second side surface 10b, the upper surface 10c and the lower surface 10d in the second area 12 of the shell 10.

[0050] The cover 13 is made of conductive material such as iron or aluminum.

[0051] Furthermore, at least the front surface 10e, the rear surface 10f, and the upper surface 10c and the lower surface 10d of the first region 11 are open so that cold air from the cooling portion 30 reaches the resistor portion 20 and is then exhausted from the rear surface 10f.

[0052] In order to efficiently perform air intake, it is preferred that the first side surface 10 a and the second side surface 10 b also have opening areas other than areas where components such as the first terminal connection portion 41 are mounted.

[0053] In the case of the first load test, the areas where the operating unit 47 is not installed, including the openings on the upper surface 10c, the lower surface 10d, and the front surface 10e of the first area 11, are mainly used for air intake by the cooling fan of the cooling unit 30, and the openings on the rear surface 10f are used for exhaust by the cooling fan of the cooling unit 30.

[0054] In the case of the second load test, the areas without the operating unit 47 installed in the openings of the upper surface 10c and the lower surface 10d of the first area 11 and the opening of the front surface 10e are mainly used to suction air for the cooling fan of the cooling unit 30, and the opening of the rear surface 10f is used to exhaust air for the cooling fan of the cooling unit 30.

[0055] On the first side surface 10 a and the second side surface 10 b in the first region 11 of the housing 10 , rack mounting brackets 51 are mounted, and the load testing device 1 is mounted to the server rack 90 via the rack mounting brackets 51 .

[0056] The server rack 90 is usually used to hold a computer server, and holds the load test device 1 instead of the computer server during the first load test.

[0057] Since the load testing device 1 is installed in the server rack 90 , the width of the housing 10 (the distance between the first side surface 10 a and the second side surface 10 b ) is shorter than the width of the server rack 90 .

[0058] In particular, when the server rack 90 is a 19-inch rack, the width of the housing 10 is set so that the width between the rack mounting bracket 51 installed on the first side surface 10a of the housing 10 and the rack mounting bracket 51 installed on the second side surface 10b of the housing 10 (the distance between the holes installed in the server rack 90) is 19 inches (about 480 mm).

[0059] The resistor section 20 is used for load tests (first load test, second load test) and is formed by arranging a plurality of resistor arrays in the y direction. The resistor array is formed by arranging a plurality of rod-shaped resistors Re parallel to the x direction at predetermined intervals in the z direction.

[0060] In the first load test (first embodiment) of the air conditioner for cooling the computer server, the first terminal connection portion 41 is connected to the same commercial power supply as that for supplying power to the computer server, and the resistor Re receives power from the commercial power supply.

[0061] In the second load test of the generator or battery (second embodiment), the first terminal connection portion 41 is connected to a test object power source (generator or battery), and the resistor Re receives power supply from the test object power source.

[0062] In this embodiment, the resistor row in which four resistors Re are arranged in the z direction is arranged in six stages in the y direction. However, the number of resistors Re arranged in each resistor row and the number of stages in which the resistor row is stacked are not limited thereto.

[0063] In the resistors Re constituting the resistor section 20, a plurality of adjacent resistors Re are connected in series or in parallel as one resistor group, and a load test is performed while changing the number of resistor groups to which voltage is applied from a commercial power supply (first embodiment) or a test object power supply (second embodiment).

[0064] The resistor section 20 includes first to eighth resistor groups G1 to G8. However, the number of resistor groups G is not limited to the above structure.

[0065] The terminals of the resistor Re are connected to the terminals of other resistors Re through shorting bars, or are connected to the first terminal connection portion 41 or the relay portion 45 via cables.

[0066] However, except in Figure 6 The cable connecting the first terminal connection part 41 and the commercial power supply, the cable connecting the second terminal connection part 42 and the commercial power supply, Figure 8 Except for the cable connecting the first terminal connection portion 41 and the test object power supply, and the cable connecting the second terminal connection portion 42 and the commercial power supply, the short-circuit bar and the cables are omitted.

[0067] The portion of the resistor Re that is not electrically connected to the terminal is held by the wall formed by the holding plate 21 .

[0068] It is preferable that the portion of the resistor Re protruding from the wall formed by the holding plate 21 (the terminal of the resistor Re) is covered with a cover (not shown) formed of an insulating member such as rubber.

[0069] In order to efficiently perform the cooling performed by the cooling unit 30, the resistors Re of the resistor columns adjacent in the y direction are arranged at the middle position between the resistor Re constituting the resistor column and the resistor Re adjacent to the resistor Re in the z direction, and the resistors Re of each resistor column are arranged in this way.

[0070] The cooling unit 30 includes a cooling fan that cools the resistor Re of the resistor unit 20 using air introduced from the outside.

[0071] The cooling fan is driven by a commercial power supply (power supply for driving the load test device) (refer to Figure 2 ).

[0072] The cooling fan is preferably detachably mounted to the first region 11 of the housing 10 using screws or the like.

[0073] In this case, the cooling fan of the cooling unit 30 and the operating unit 47 can be carried separately from the housing 10 of the load test device 1, and the cooling unit 30 and the operating unit 47 can be installed on the housing 10 at the site of the load test.

[0074] In particular, in a state where the operation portion 47 is removed from the housing 10 (at least in a state where the operation portion 47 is removed from the upper surface 10 c and the lower surface 10 d of the housing 10 ), the cooling fan of the cooling portion 30 can be easily attached and detached.

[0075] The load test device 1 can perform a load test with the cooling unit 30 and the resistor unit 20 arranged in the horizontal direction (first embodiment) or can perform a load test with the cooling unit 30 and the resistor unit 20 arranged in the vertical direction (second embodiment).

[0076] The cooling air sent from the cooling unit 30 to the resistor unit 20 is exhausted from the rear surface 10 f of the housing 10 .

[0077] The connection switching unit 40 includes a first terminal connection unit 41, a second terminal connection unit 42, a relay unit 45, and an operation unit 47 (see Figures 2 to 4 , Figure 7 ).

[0078] The first terminal connection portion 41 is a terminal for connecting a cable to a commercial power supply (first embodiment) or a test object power supply such as a generator (second embodiment). The commercial power supply (first embodiment) or the test object power supply (second embodiment) can be connected to the resistor group (first resistor group G1 to eighth resistor group G8) constituting the resistor portion 20 via the first terminal connection portion 41.

[0079] The cable connection between the first terminal connection portion 41 and the commercial power supply (first embodiment) or the test object power supply (second embodiment) is performed between the area where the rack mounting bracket 51 is mounted in the opening of the first side surface 10a and the front surface 10e (see Figure 6 ).

[0080] Preferably, a circuit breaker such as a VCB (Vacuum Circuit Breaker) is provided between the first terminal connection portion 41 and the relay portion 45 , or at the first terminal connection portion 41 .

[0081] The second terminal connection portion 42 is a terminal for cable connection with a commercial power source, and the commercial power source can be connected to the cooling fan of the cooling unit 30 , the relay of the relay unit 45 , and the operation unit 47 via the second terminal connection portion 42 .

[0082] However, in the second load test, the second terminal connection portion 42 may also be connected to the test object power supply, and the cooling fan of the cooling unit 30, the relay of the relay unit 45, and the operation unit 47 may be driven using the power supplied from the test object power supply.

[0083] The cable connection between the second terminal connection portion 42 and the commercial power source is performed between the area where the rack mounting bracket 51 is mounted in the opening of the first side surface 10a and the front surface 10e (see Figure 6 ).

[0084] Preferably, a circuit breaker such as a molded case circuit breaker (MCCB) is provided between the second terminal connection portion 42 and the relay portion 45 , or at the second terminal connection portion 42 .

[0085] The relay unit 45 includes: a relay (cooling fan relay RC) that controls the on-off supply of power to the cooling unit 30 in accordance with the operation of the switch of the operating unit 47, and relays (first relay R1 to eighth relay R8) that control the on-off supply of power to each of the resistor groups (first resistor group G1 to eighth resistor group G8) constituting the resistor unit 20.

[0086] The relays (cooling fan relay RC, first relay R1 to eighth relay R8) constituting the relay unit 45 are driven by a commercial power supply (power supply for driving the load test device) (see Figure 2 , Figure 3 ).

[0087] The operation unit 47 includes a power switch 47a, a cooling fan switch 47b, a resistance switching switch 47c, and a display unit 47d (see Figure 3 ).

[0088] The power switch 47 a is a slide type (or toggle type, push button type) operation switch for selecting whether the load test device 1 is turned on or off.

[0089] When the power switch 47a is turned on, the circuit breaker of the first terminal connection part 41 or the relay not shown in the figure is in the on state, and the current from the commercial power supply (first embodiment) or the test object power supply (second embodiment) connected to the load test device 1 flows into the first relay R1 to the eighth relay R8 of the relay part 45 through the first terminal connection part 41.

[0090] When the power switch 47 a is turned on, the circuit breaker or the relay (not shown) of the second terminal connection part 42 is turned on, and the current from the commercial power supply connected to the load test device 1 flows into the cooling fan relay RC of the relay part 45 and the operation part 47 through the second terminal connection part 42 .

[0091] The cooling fan switch 47 b is a slide type (or toggle type, push button type) operation switch for selecting on and off (mode switching) of the cooling fan of the cooling unit 30 .

[0092] When the cooling fan switch 47 b is turned on, the cooling fan relay RC is turned on, and the current from the commercial power supply connected to the load test device 1 flows into the cooling fan of the cooling unit 30 via the second terminal connection portion 42 .

[0093] The resistance switching switch 47c (the first resistance switching switch 47c1 to the eighth resistance switching switch 47c8) is a sliding type (or toggle type, button type) operating switch, which is used to control the on and off of each relay (the first relay R1 to the eighth relay R8) in the first resistor group G1 to the eighth resistor group G8.

[0094] When the first resistance switching switch 47c1 is turned on, the relay (first relay R1) of the first resistor group G1 is in the on state, and the current from the commercial power supply (first embodiment) or the test object power supply (second embodiment) connected to the load test device 1 flows into the first resistor group G1 via the first terminal connection part 41.

[0095] Similarly, when the second resistor switching switch 47c2 to the eighth resistor switching switch 47c8 are turned on, the relays of the corresponding resistor groups are in the on state, and the current from the commercial power supply (first embodiment) or the test object power supply (second embodiment) connected to the load test device 1 flows into the resistor group via the first terminal connection part 41.

[0096] The display unit 47d is a display unit that indicates the operating state of the load test device 1, and includes a first lighting unit 47d1 that lights up during normal operation, a second lighting unit 47d2 that lights up during a warning, and a third lighting unit 47d3 that lights up when the operation is stopped due to an abnormality.

[0097] The display unit 47d can also display the current flowing through the first resistor group G1 to the eighth resistor group G8, the voltage applied to the first resistor group G1 to the eighth resistor group G8, the power value, the load amount, the test time, etc., as well as the operating status such as whether it is operating normally.

[0098] The operation portion 47 is detachably mounted on the front surface 10 e of the housing 10 (first embodiment) or the upper surface 10 c (second embodiment, may be the lower surface 10 d ) in the first region 11 of the housing 10 .

[0099] The operation portion 47 is mounted to the housing 10 by passing a screw or the like through a first mounting hole 49 a provided in the housing 471 .

[0100] The operating portion 47 is mounted on the front surface 10e (first embodiment) which is parallel to the rear surface 10f and is the first area 11 of the shell 10, or is mounted on any one of the upper surface 10c, the lower surface 10d and the side surface (first side surface 10a, the second side surface 10b) which are perpendicular to the front surface 10e and are the first area 11 of the shell 10.

[0101] When the operation unit 47 is mounted on any one of the opening of the upper surface 10c, the lower surface 10d, and the side surfaces (the first side surface 10a, the second side surface 10b), cooling air is sucked in using at least the opening of the front surface 10e (second embodiment).

[0102] When the operation unit 47 is mounted on the front surface 10e, cooling air is sucked in using at least one of the openings on the upper surface 10c, the lower surface 10d, and the side surfaces (the first side surface 10a and the second side surface 10b) of the first region 11 (first embodiment).

[0103] In this embodiment, the operation portion 47 can be detachably mounted in not only one position but at least two positions (the front surface 10e, the upper surface 10c (or the lower surface 10d, the first side surface 10a, the second side surface 10b)).

[0104] Therefore, the load test device 1 can be easily operated regardless of whether the resistor section 20 and the cooling section 30 are arranged in the horizontal direction or in the vertical direction.

[0105] The operation unit 47 has a recessed portion 473 that is recessed relative to the housing 471, so that when the operation unit 47 is mounted on the housing 10, the power switch 47a and the like do not protrude from the front surface 10e or the upper surface 10c. The power switch 47a, the cooling fan switch 47b, the resistance switching switch 47c, and the display unit 47d are arranged in the recessed portion 473.

[0106] A contact 48 is provided on the back side of the recess 473 (the opposite side to the outer side where the power switch 47a, etc. are provided), and electrical connection among the power switch 47a, the first terminal connection part 41, the second terminal connection part 42, the cooling fan switch 47b, the cooling fan relay RC, the first resistance switching switch 47c1 and the first relay R1, etc. is performed through the contact 48.

[0107] By performing attachment and detachment via the contact 48 , the operation portion 47 can be easily electrically wired.

[0108] The housing 471 is provided with a second mounting hole 49b in addition to the first mounting hole 49a.

[0109] The setting member 50 has a rack mounting bracket 51 and a handle 53 .

[0110] The rack mounting bracket 51 has an L-shape, one surface of which is mounted to the first side surface 10a and the second side surface 10b of the housing 10 using screws, etc., and the other surface of which is mounted to the server rack 90 using screws, etc. (first embodiment).

[0111] The load test device 1 is mounted to the server rack 90 so that a portion of the first region 11 (the front surface 10e, etc.) protrudes from the server rack 90. ​​The first terminal connection portion 41 and the second terminal connection portion 42 are arranged in the first region 11 closer to the front surface 10e side than the position (the mounting position of the rack mounting bracket 51) of the side surface (the first side surface 10a or the second side surface 10b) of the housing 10 mounted on the server rack 90.

[0112] In the second embodiment, the rack mounting bracket 51 is not used.

[0113] The handle 53 has a U-shape, and two or more handles 53 are provided.

[0114] In the first embodiment in which the operation unit 47 is mounted on the front surface 10 e of the housing 10 , a handle 53 is mounted on the front surface 10 e via the second mounting hole 49 b for mounting and removing the load testing device 1 to and from the server rack 90 .

[0115] In a second embodiment in which the operating portion 47 is mounted on the upper surface 10c in the first area 11 of the shell 10, the handle 53 is mounted on the front surface 10e without passing through the second mounting hole 49b, and is used to provide a certain spacing between the front surface 10e serving as the bottom surface of the shell 10 and the placement surface on which the load test device 1 is placed, thereby being used for suction.

[0116] However, in the second embodiment, instead of the two or more U-shaped handles 53, four or more casters 54 may be attached to the front surface 10e (see Fig. 9 In this case, the caster 54 provides a certain interval between the front surface 10e as the bottom surface of the housing 10 and the placement surface on which the load test device 1 is placed, thereby being used for air suction.

[0117] When conducting the first load test, i.e., a load test of an air-conditioning device for cooling a computer server, the load test device 1 is configured such that the cooling portion 30 and the resistor portion 20 are arranged in a horizontal direction, and power from a commercial power supply is supplied to the resistor group (the first resistor group G1 to the eighth resistor group G8) via the first terminal connection portion 41 and the relay portion 45 (the first relay R1 to the eighth relay R8). The side surfaces (the first side surface 10a and the second side surface 10b) of the shell 10 are mounted on a server rack 90 that holds the computer server, and the operating portion 47 is mounted on the front surface 10e of the shell 10. Air is inhaled using at least one of the opening of the front surface 10e, the opening of the upper surface 10c of the first area 11, and the opening of the lower surface 10d, and exhaust is performed in a horizontal direction from the rear surface 10f of the shell 10.

[0118] When conducting the second load test, i.e., a load test of the test object power source such as a generator or a battery, the load test device 1 is configured such that the cooling part 30 is arranged below and the resistor part 20 is arranged above, and the handle 53 (or caster 54) is used to provide a certain interval between the front surface 10e and the placement surface on which the load test device 1 is placed, and power from the test object power source is supplied to the resistor group (the first resistor group G1 to the eighth resistor group G8) via the first terminal connecting part 41 and the relay part 45 (the first relay R1 to the eighth relay R8), and the operating part 47 is installed on the upper surface 10c or the lower surface 10d of the shell 10, and air is sucked in using at least one of the opening of the front surface 10e, the opening of the upper surface 10c of the first area 11, and the opening of the lower surface 10d, and exhaust is performed from the rear surface 10f in an upward direction.

[0119] In the first load test, the load test device 1 is installed on a server rack 90 in which a computer server is installed. The resistance part 20 of the load test device 1 is supplied with power using a commercial power supply for driving the computer server. Under conditions such as the same heat generation as when driving the computer server, the air conditioning equipment in the room in which the computer server is installed is operated to confirm whether the cooling capacity of the air conditioning equipment is sufficient.

[0120] At this time, the load test device 1 is installed in the server rack 90 in the same manner as a computer server.

[0121] Since the blowing direction of the air-conditioning equipment must be set in consideration of the location of the cooling object such as the computer server, the load test device 1 is made to generate heat at the same level as the heat generated by the computer server at the location where the computer server is installed. Therefore, the load test (first load test) of the air-conditioning equipment can be performed in an environment close to the actual operation of the computer server.

[0122] The first terminal connection portion 41 and the second terminal connection portion 42 for cable connection to the commercial power supply are arranged on the first side surface 10a closer to the front surface 10e than the position where the rack mounting bracket 51 is installed, and protrude from the server rack 90. ​​Therefore, even after the load testing device 1 is installed on the server rack 90, the cable connection can be easily performed.

[0123] In addition, the operating part 47 can be installed not only to the front surface 10e, but also to other surfaces (here, the upper surface 10c), and can perform a load test not only by exhausting air in the horizontal direction as in the first embodiment, but also by exhausting air in the upward direction as in the second embodiment (second load test).

[0124] At this time, by using the handle 53 or the casters 54 , a gap can be provided for allowing cooling air to enter from between the front surface 10 e constituting the bottom surface of the housing 10 and the placement surface of the load test device 1 .

[0125] Regarding the operation of the operating unit 47, in addition to the method in which the operator directly operates the switch of the operating unit 47, a communication unit 59 is provided for performing two-way wireless communication with an external communication terminal 69 (for example, a mobile phone installed with predetermined software), and the operating unit 47 (a relay linked to the on / off operation of the operating unit 47) is operated via the control unit 58 based on the instruction from the communication terminal 69 (refer to Figures 10-12 ).

[0126] In this case, the load test device 1 further includes a control unit 58 and a communication unit 59 .

[0127] The control unit 58 such as a CPU controls the operation unit 47 and the communication unit 59 .

[0128] The communication unit 59 receives an instruction signal for operating a relay corresponding to a switch of the operation unit 47 from the communication terminal 69 , and transmits information on the state of the load testing device 1 (on / off state of the relay, etc.) to the communication terminal 69 .

[0129] The wireless communication method used for communication between the communication unit 59 and the communication terminal 69 is, for example, IEEE 802.15.1 (Bluetooth (registered trademark)), IEEE 802.11 (wireless LAN), a mobile phone line, or the like.

[0130] Normally, only an operator near the operating unit 47 of the load testing device 1 can grasp the status of the load testing device 1 and operate the load testing device 1, while an operator located at a remote location relative to the load testing device 1 cannot grasp the status of the load testing device 1 and cannot operate the operating unit 47 of the load testing device 1. However, by using a communication terminal 69 that can communicate with the load testing device 1, an operator located at a remote location relative to the load testing device 1 can also grasp the status of the load testing device 1 and operate the operating unit 47 (a relay linked to the on / off operation of the operating unit 47) of the load testing device 1.

[0131] In addition, a load system including two or more load test devices 1 and a communication terminal 69 may be configured so that the communication terminal 69 can wirelessly communicate with the two or more load test devices 1 .

[0132] The communication terminal 69 communicates with the plurality of load test devices 1 and operates the operation units 47 of the plurality of load test devices 1 , thereby enabling the states of the plurality of load test devices 1 to be simultaneously displayed on a single communication terminal 69 and allowing a single operator to operate the plurality of load test devices 1 .

[0133] This is particularly effective when a plurality of load test devices 1 are provided to perform a load test (first load test) on an air conditioning system.

[0134] Specifically, the communication terminal 69 has a display function and an operation function such as a touch switch, and includes a display device 77 for displaying an on / off state display pattern D1 and a history display pattern D2 during the startup of the above-mentioned predetermined software.

[0135] The on / off status display pattern D1 indicates the status of the operating unit 47 in the load test device 1, and includes: a power status display area 77a, indicating the on / off status of the circuit breaker of the first terminal connection part 41 (the switching status of the power switch 47a); a cooling status display area 77b, indicating the on / off status of the cooling fan relay RC (the switching status of the cooling fan switch 47b); a first display area 77c1 to an eighth display area 77c8, indicating the on / off status of the first relay R1 to the eighth relay R8 corresponding to the first resistor group G1 to the eighth resistor group G8 (the switching status of the first resistor switching switch 47c1 to the eighth resistor switching switch 47c8); a load test status display area 77d, indicating the status of the load test of the load test device 1 (current value, etc.); a first switching button area 77e, used to switch to the display of the on / off status display pattern D1 corresponding to other load test devices; and a second switching button area 77f, used to switch to the display of the history display pattern D2.

[0136] When the power state display area 77 a is operated, the on / off state of the circuit breaker or the like (power switch 47 a ) of the first terminal connection portion 41 of the corresponding load test device 1 is switched.

[0137] When the cooling state display area 77 b is operated, the on / off state of the cooling fan relay RC (cooling fan switch 47 b ) of the corresponding load test device 1 is switched.

[0138] When the first display area 77c1 is operated, the on and off states of the first relay R1 (first resistance changeover switch 47c1) of the corresponding load test device 1 are switched.

[0139] When the second to eighth display areas 77c2 to 77c8 are operated similarly, the on / off states of the second to eighth relays R2 to R8 (the second to eighth resistance changeover switches 47c2 to 47c8) of the corresponding load test devices are switched.

[0140] Fig.11 An example of an on-off status display pattern D1 is shown in which, in load test device 1 (first load test device), the power switch 47a, the cooling fan switch 47b, the first resistance switching switch 47c1, and the second resistance switching switch 47c2 are in the on state, and the third resistance switching switch 47c3 to the eighth resistance switching switch 47c8 are in the off state.

[0141] The load test status display area 77d is used to display the status of the load test performed by the corresponding load test device 1 (the current flowing through the first resistor group G1 to the eighth resistor group G8, the voltage applied to the first resistor group G1 to the eighth resistor group G8, the power value, the load amount, the test time, etc., and the operating status such as whether it is operating normally).

[0142] When the first switching button area 77 e is operated, the display switches to the on / off state display pattern D1 of another load testing device 1 communicating with the communication terminal 69 .

[0143] When the second switching button area 77 f is operated, the display switches to a list display of the load test information of the load test device 1 communicating with the communication terminal 69 (history display pattern D2 ).

[0144] The historical display pattern D2 includes: an ongoing display area 77g, which indicates the status of the load test of the load test device 1 in communication with the communication terminal 69; and a past display area 77h, which indicates the content of the past load test of the load test device 1 that has communicated with the communication terminal 69 (the date and time of the load test, etc.).

[0145] Fig.12 An example of a historical display pattern D2 is shown, including: two ongoing display areas 77g (77g1, 77g2), indicating the status of load tests of two load test devices 1 (a first load test device and a second load test device) in communication with the communication terminal 69; and three past display areas 77h (77h1, 77h2, 77h3), indicating the contents of past load tests of three load test devices 1 (a first load test device, a second load test device and a third load test device) that have communicated with the communication terminal 69.

[0146] In addition, a use mode switching button area 77i (see FIG. 14 ) for performing disconnection control based on the communication state may be provided in the on / off state display pattern D1. Fig.13 ).

[0147] When the mode switching button area 77i is used to enter a disconnection control mode based on the communication status, when the communication status between the communication unit 59 and the communication terminal 69 is disconnected, the control unit 58 disconnects (at least one) of the relays in the on state among the first relay R1 to the eighth relay R8, thereby reducing the load.

[0148] For example, only the relays corresponding to the resistor group having a small resistance value among the resistor groups may be turned on, and the relays corresponding to the other resistor groups may be turned off.

[0149] In order to avoid failures caused by sudden changes in load, it is better not to change all the relays in the on state to the off state at the same time, but to do it step by step, that is, to disconnect them one by one every first time t1 (for example, t1=10 seconds).

[0150] Thus, power is supplied from the commercial power supply or the test object power supply via the first terminal connection portion 41 only to the resistor group corresponding to the relay in the on state.

[0151] However, at least one of the relays corresponding to the resistor group is not turned off until the second time t2 (for example, t2 = 5 minutes) elapses from the start of the control to reduce the load, but is maintained in the turned-on state.

[0152] In addition, the communication terminal 69 displays a warning display pattern D3 (see Fig.14 ).

[0153] The warning display pattern D3 outputs text indicating “communication with the communication unit has been disconnected” and “the load of the load test device is gradually reduced, and the operation is stopped after the second time t2 has passed”.

[0154] Instead of or in addition to the warning display pattern D3, the communication terminal 69 may output sounds indicating "communication with the communication unit has been disconnected" and "the load of the load test device is gradually reduced and operation is stopped after the second time t2 has passed."

[0155] Furthermore, after the second time t2 has elapsed since the load reduction, the control unit 58 turns off the relays in the on state among the first to eighth relays R1 to R8 to stop the power supply to the resistor unit 20 .

[0156] Thereafter, the control unit 58 turns the cooling fan relay RC to the off state, and the load test ends.

[0157] After the communication between the communication unit 59 and the communication terminal 69 is disconnected, before all relays corresponding to the resistor group in the load test device 1 are disconnected (before the second time t2 elapses), if the communication is restored, the control of the disconnection state is stopped step by step, and the communication terminal 69 displays a communication restoration display pattern including information related to the communication restoration (see Fig.15 ).

[0158] The communication recovery display pattern D4 outputs text indicating “communication with the communication unit has been recovered”, “load test can be continued”, and “on / off state of the switch is confirmed (on / off state of the switch changes due to step-by-step disconnection control)”.

[0159] The communication terminal 69 may also output a sound indicating "communication with the communication unit has been restored", "load test can continue", "on and off status of the switch is confirmed (the on and off status of the switch changes due to gradual disconnection control)" instead of or in addition to the communication recovery display pattern D4.

[0160] The interstitial display of the warning display pattern D3 and the communication recovery display pattern D4 ends after a predetermined operation (for example, touching the area where the interstitial display warning display pattern D3 is displayed, etc.), or ends after a third time t3 (for example, t3 = 30 seconds) has passed after the start of the interstitial display.

[0161] Furthermore, the communication terminal 69 receives information on the on / off state of each relay in the load testing device 1 and updates the on / off state display pattern D1 .

[0162] When the communication between the communication unit 59 and the communication terminal 69 is disconnected, the load state of the load test device 1 cannot be controlled by operating the communication terminal 69. However, the load is reduced due to the disconnection of the communication, and the safety of the load test device 1 can be ensured.

[0163] In addition, from the time when the load is reduced to the time when the second time t2 passes, the load test is continued with a low load, and the load is increased by the operator operating the operation unit 47, or by the operator operating the communication terminal 69 after the communication state is restored, and the load test is started again with a high load.

[0164] use Fig.16 An example of a process of gradual disconnection control based on communication cutoff is explained with reference to a flowchart.

[0165] In step S11, the control unit 58 determines whether the communication state between the communication unit 59 and the communication terminal 69 has been disconnected for a fourth time t4 or longer (for example, t4=10 seconds).

[0166] If it has been disconnected, the process proceeds to step S12. If it has not been disconnected, the process proceeds to step S11 again after a fifth time t5 (eg, t5 = 5 seconds).

[0167] The controller 58 performs step-by-step disconnection control in step S12.

[0168] Specifically, the control unit 58 turns off one of the relays corresponding to the resistor group that is in the on state.

[0169] However, when the number of relays in the on state among the relays corresponding to the resistor group is a predetermined number (for example, one), the relay is not turned off and the process proceeds to step S13.

[0170] Furthermore, when the communication state between the communication unit 59 and the communication terminal 69 is disconnected for a fourth period of time or longer, the communication terminal 69 displays the warning display pattern D3.

[0171] After the first time t1 has elapsed since step S12, the control unit 58 determines in step S13 whether a second time t2 has elapsed since the gradual disconnection control in step S12 was first performed.

[0172] If the second time t2 has elapsed, the process proceeds to step S16; if not, the process proceeds to step S14.

[0173] In step S14 , the control unit 58 determines whether the communication state between the communication unit 59 and the communication terminal 69 has been restored, that is, whether the communication unit 59 and the communication terminal 69 can communicate with each other.

[0174] If the communication state has been restored, the process proceeds to step S15; if not, the process proceeds to step S12.

[0175] In step S15, the control unit 58 cancels the gradual disconnection control, and the communication terminal 69 displays the communication recovery display pattern D4.

[0176] In step S16, the control unit 58 turns off the remaining predetermined number of relays in the on state, and ends the process.

[0177] When the communication status between the communication unit 59 and the communication terminal 69 is cut off by using the mode switching button area 77i and the mode in which the disconnection control is not performed based on the communication status, the control unit 58 does not perform the above-mentioned disconnection control (disconnection control that gradually reduces the load and eventually stops the load test device 1), and the communication terminal 69 does not output a warning but continues the load test.

[0178] Description of Reference Numerals

[0179] 1 Load test device

[0180] 10 Housing

[0181] 10a First side surface

[0182] 10b Second side surface

[0183] 10c Upper surface

[0184] 10d Lower surface

[0185] 10e front surface

[0186] 10f rear surface

[0187] 11. First Area

[0188] 12 Second Area

[0189] 13 Cover

[0190] 13a First side surface cover

[0191] 13b Second side surface cover

[0192] 13c Upper surface cover

[0193] 13d Lower surface cover

[0194] 20 Resistor

[0195] 30 Cooling Section

[0196] 40 Connection switching unit

[0197] 41 First terminal connection portion

[0198] 42 second terminal connection portion

[0199] 45 Relay

[0200] 47 Operation Department

[0201] 47a Power switch

[0202] 47b Cooling fan switch

[0203] 47c resistor switch

[0204] 47c1~47c8 First resistance switching switch~eighth resistance switching switch

[0205] 47d Display unit

[0206] 471 Housing

[0207] 473 concavity

[0208] 48 contacts

[0209] 49a First mounting hole

[0210] 49b Second mounting hole

[0211] 50 Setting Widgets

[0212] 51 Rack Mount Bracket

[0213] 53 Handle

[0214] 54 Casters

[0215] 58 Control Department

[0216] 59 Ministry of Communications

[0217] 69 Communication Terminal

[0218] 77a Power status display area

[0219] 77b Cooling status display area

[0220] 77c1~77c8 First display area~eighth display area

[0221] 77d Load test status display area

[0222] 77e First switch button area

[0223] 77f Second switch button area

[0224] 77g In progress display area

[0225] 77h Past display area

[0226] 77i Use the mode switch button area

[0227] 90 Server Racks

[0228] D1 on / off status display pattern

[0229] D2 History Display Pattern

[0230] D3 warning display pattern

[0231] D4 Communication recovery display pattern

[0232] G1~G8 The first resistor group to the eighth resistor group

[0233] R1~R8 1st relay~8th relay

[0234] RC Cooling Fan Relay

[0235] Re Resistors

[0236] t1 First time (time interval for gradually reducing load)

[0237] t2 Second time (the time until all relays corresponding to the resistor group are disconnected)

[0238] t3 The third time (the time until the interstitial display ends)

[0239] t4 Fourth time (the time during which the communication status is disconnected)

[0240] t5 Fifth time (time interval for determination in step S11)

Claims

1. A load system, comprising: Load test device; as well as a communication terminal, used for wireless communication with the load test device, The load test device includes a communication unit for wirelessly communicating with the communication terminal. The communication unit transmits information related to the on / off state of the load test device to the communication terminal, and receives a signal related to an instruction to operate the load test device from the communication terminal. The load test device includes a resistor section having a plurality of resistor groups including resistors. The load test was performed while changing the number of resistor groups to which the voltage from the power supply was applied. When the communication between the communication unit and the communication terminal is cut off, some of the relays in the on state among the relays of the load test device corresponding to the plurality of resistor groups of the resistor unit are gradually changed to an off state, When the communication cut-off state between the communication unit and the communication terminal is not restored after the communication is cut off and a prescribed time has passed, all relays in the on state are changed to the off state; when the communication between the communication unit and the communication terminal is restored before the prescribed time has passed after the communication is cut off, the control of gradually changing to the off state is stopped, some of the relays in the off state are changed to the on state, and the communication terminal displays information related to the restoration of the communication.

2. A load test device, comprising: a resistor section provided with a plurality of resistor groups having resistors; as well as A communication unit, used for wireless communication with a communication terminal, The communication unit transmits information related to the on / off state of the load test device to the communication terminal, and receives a signal related to an instruction to operate the load test device from the communication terminal. The load test was performed while changing the number of resistor groups to which the voltage from the power supply was applied. When the communication between the communication unit and the communication terminal is cut off, some of the relays in the on state among the relays of the load test device corresponding to the plurality of resistor groups of the resistor unit are gradually changed to an off state, When the communication cut-off state between the communication unit and the communication terminal is not restored after the communication is cut off and a prescribed time has passed, all the relays in the on state are changed to the off state; when the communication between the communication unit and the communication terminal is restored before a prescribed time has passed after the communication is cut off, the control of gradually changing to the off state is stopped, and some of the relays in the off state are changed to the on state.

Images