Inverter with speed setting switching mode in emergency

Abstract

The present invention discloses a frequency converter with speed setting switching mode in an emergency state, comprising a neutral line N, a live line L, a frequency converter and a motor, wherein the output end of the frequency converter is electrically connected to the motor, the input end of the frequency converter is electrically connected to the output end of a mode conversion switch, the input end of the mode conversion switch is electrically connected to the output end of a host computer and the output end of a manual control mechanism, respectively, the power supply end of the host computer is electrically connected to the neutral line N and the live line L, respectively, and the power supply end of the manual control mechanism is electrically connected to the neutral line N and the live line L. The present invention has the advantages of simple structure, safety and reliability, and no erroneous judgment and conversion operation during the conversion process.

Description

Technical Field

[0001] The present invention relates to the field of frequency converter speed control, and more particularly to a frequency converter with a speed setting switching mode under emergency conditions. Background Art

[0002] At present, most motors are driven by inverters. When controlled by inverters, the speed command is usually input to the inverter through the controller, and the inverter outputs a certain speed / current command to control the motor rotation. Most inverters use a system mode where the controller command is input to the inverter through the Profibus communication protocol and the serial communication protocol. Generally, the PLC outputs the speed command. Once an emergency occurs or the PLC communication is poor, the inverter speed change command needs to be manually given through program control or the operation panel. The response speed of this method is slow. Summary of the invention

[0003] In order to overcome the above problems, the present invention provides a frequency converter with a speed setting switching mode in an emergency state and a fast switching mode function.

[0004] A frequency converter with speed setting switching mode in an emergency state of the present invention comprises a neutral line N, a live line L, a frequency converter and a motor, wherein the output end of the frequency converter is electrically connected to the motor, the input end of the frequency converter is electrically connected to the output end of a mode conversion switch, the input end of the mode conversion switch is electrically connected to the output end of a host computer and the output end of a manual control mechanism, respectively, the power end of the host computer is electrically connected to the neutral line N and the live line L, respectively, and the power end of the manual control mechanism is electrically connected to the neutral line N and the live line L, respectively.

[0005] The model of the inverter is VT240S. The present invention uses an external switch to realize the switching function of normal state / emergency state based on the internal function of the VT240S inverter. The VT240S has a CFS serial setting function setting. When CFS is ON, the motor speed command can be serially set by the host computer; when CFS is OFF, the motor speed is manually set by the user through the manual control mechanism. CFS is defined by the input program control PSI6. When it is ON, it is the general state of the automatic mode. If in emergency state or manual mode, PSI6 is OFF. The switch of PSI6 switches the general state / emergency state by turning the mode conversion switch ON / OFF.

[0006] Preferably, the manual control mechanism includes a rotary switch, a resistor R1, a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2, wherein pin 1 of the rotary switch is electrically connected to pin 1 of the inductor L1, pin 2 of the rotary switch is electrically connected to pin 2 of the inductor L1, pin 3 of the rotary switch is electrically connected to pin 3 of the inductor L1, pin 4 of the rotary switch is electrically connected to pin 4 of the inductor L1, pin 5 of the rotary switch is electrically connected to one end of the resistor R1 and one end of the capacitor C1 respectively, and the resistor R 1 and the other end of the capacitor C1 are electrically connected to pin 1 of the inductor L1 respectively, pin 1 of the inductor L1 is electrically connected to one end of the inductor L2, pin 4 of the inductor L1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C2 is electrically connected to the other end of the inductor L2, the other end of the inductor L2 is electrically connected to the No. 2 signal input terminal, the other end of the capacitor C2 is electrically connected to the neutral line N, pin 7 of the rotary switch is electrically connected to the live wire L, and pin 8 of the rotary switch is electrically connected to the motor.

[0007] The rotary switch is used to adjust the speed gear of the motor, which is convenient for users to control.

[0008] Preferably, the mode conversion switch includes a base, a control chip is provided above the base, a rocker assembly and a drive motor are provided on the base, the rocker assembly and the drive motor are transmitted by setting a gear group, the rocker assembly is movably connected to the base, a switch assembly for adjusting the rocker assembly is provided next to the gear group, the output end of the control chip is electrically connected to the control end of the drive motor, and the input end of the control chip is electrically connected to the output end of the host computer and the output end of the manual control mechanism respectively.

[0009] When an emergency situation occurs and the motor needs to be manually controlled, the host computer can switch to the manual control mechanism by controlling the automatic transfer switch body and the drive motor. When the state of the automatic transfer switch or the drive motor changes, the switch component will feed back the signal to the host computer for the user to view, thereby improving the stability of the present invention.

[0010] Preferably, the rocker arm assembly comprises a left rocker arm, a right rocker arm, a left slide rail and a right slide rail, the left slide rail and the right slide rail are respectively fixed to the left and right ends of the base by bolts, and the left rocker arm and the right rocker arm are respectively slidably connected to the left slide rail and the right slide rail.

[0011] Preferably, the left rocker arm and the right rocker arm have the same structure, the left slide rail and the right slide rail have the same structure, the left rocker arm comprises a rocker arm body, a clamp body is provided at the left end of the rocker arm body, a rack used in conjunction with a gear set is provided at the right end of the rocker arm body, and at least two slide buckles are provided at the bottom of the rocker arm body for sliding engagement with the left slide rail.

[0012] Preferably, the gear set includes a driving gear as the main body, the center of the driving gear is installed at the output end of the driving motor, the left and right sides of the driving gear are respectively gear-connected with the driven wheel group, the upper edge of the driving gear is provided with an arc-shaped protrusion used in conjunction with the rocker arm assembly, the lower edge of the driving gear is provided with driving external teeth used in conjunction with the driven wheel group, and the remaining edges of the driving gear are all smooth arcs.

[0013] Preferably, the driven wheel set includes a transition gear and a transmission gear, the transition gear is meshed with the driving outer teeth and the transmission gear respectively, and the transmission gear is meshed with the rocker arm assembly.

[0014] Preferably, the switch assembly includes a driving micro switch, and a driven micro switch is respectively provided on the left and right sides of the driving micro switch, the trigger end of the driving micro switch is transmitted and triggered by the arc-shaped protrusion of the driving gear, and the trigger end of the driven micro switch is transmitted and triggered by the rocker arm assembly.

[0015] 1. The inverter has a serial communication function inside. Under normal conditions, the mode conversion switch connects the host computer, the inverter and the motor into a loop. At this time, the speed command of the motor is set by the host computer.

[0016] 2. The host computer sends the motor speed command to the inverter, and then the host computer controls the inverter to perform frequency conversion processing.

[0017] 3. After the frequency conversion process, the inverter will send the output frequency to the motor for speed change processing.

[0018] When encountering an emergency and needing to manually adjust the motor speed, the user can operate the mode conversion on and off to connect the manual control mechanism, the inverter and the motor into a loop.

[0019] 5. The user can adjust the speed gear of the motor by manually turning the rotary switch.

[0020] The present invention has the following beneficial effects: simple structure, safety and reliability, and no erroneous judgment and conversion operation will occur during the conversion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0022] Attached Figure 2 It is a circuit schematic diagram of the present invention.

[0023] Attached Figure 3 It is a top view of the manual control mechanism of the present invention.

[0024] Attached Figure 4 It is a front view of the manual control mechanism of the present invention.

[0025] Attached Figure 5 It is a front view of the left rocker arm of the manual control mechanism of the present invention.

[0026] Attached Figure 6 It is a rear view of the left rocker arm of the manual control mechanism of the present invention.

[0027] Base 1, drive motor 2, left rocker arm 3, right rocker arm 4, left slide rail 5, right slide rail 6, rocker arm body 7, clamp body 8, rack 9, slider 10, drive gear 11, arc-shaped protrusion 12, drive outer tooth 13, transition gear 14, transmission gear 15, drive micro switch 16, driven micro switch 17. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0029] Embodiment: According to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 and attached Figure 6 To further explain, in this example, a frequency converter with speed setting switching mode in an emergency state includes a neutral line N, a live line L, a frequency converter and a motor, the output end of the frequency converter is electrically connected to the motor, the input end of the frequency converter is electrically connected to the output end of the mode conversion switch, the input end of the mode conversion switch is electrically connected to the output end of the host computer and the output end of the manual control mechanism, the power end of the host computer is electrically connected to the neutral line N and the live line L, and the power end of the manual control mechanism is electrically connected to the neutral line N and the live line L, respectively.

[0030] The manual control mechanism includes a rotary switch, a resistor R1, a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2, wherein pin 1 of the rotary switch is electrically connected to pin 1 of the inductor L1, pin 2 of the rotary switch is electrically connected to pin 2 of the inductor L1, pin 3 of the rotary switch is electrically connected to pin 3 of the inductor L1, pin 4 of the rotary switch is electrically connected to pin 4 of the inductor L1, pin 5 of the rotary switch is electrically connected to one end of the resistor R1 and one end of the capacitor C1 respectively, and the The other end and the other end of the capacitor C1 are respectively electrically connected to pin 1 of the inductor L1, pin 1 of the inductor L1 is electrically connected to one end of the inductor L2, pin 4 of the inductor L1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C2 is electrically connected to the other end of the inductor L2, the other end of the inductor L2 is electrically connected to the No. 2 signal input terminal, the other end of the capacitor C2 is electrically connected to the neutral line N, pin 7 of the rotary switch is electrically connected to the live wire L, and pin 8 of the rotary switch is electrically connected to the motor.

[0031] The mode conversion switch includes a base 1, a control chip is provided above the base 1, a rocker assembly and a drive motor 2 are provided on the base 1, the rocker assembly and the drive motor 2 are transmitted by setting a gear group, the rocker assembly is movably connected to the base 1, a switch assembly for adjusting the rocker assembly is provided next to the gear group, the output end of the control chip is electrically connected to the control end of the drive motor 2, and the input end of the control chip is electrically connected to the output end of the host computer and the output end of the manual control mechanism respectively.

[0032] The rocker arm assembly includes a left rocker arm 3, a right rocker arm 4, a left slide rail 5 and a right slide rail 6. The left slide rail 5 and the right slide rail 6 are respectively fixed to the left and right ends of the base 1 by bolts. The left rocker arm 3 and the right rocker arm 4 are respectively slidably connected to the left slide rail 5 and the right slide rail 6.

[0033] The left rocker arm 3 and the right rocker arm 4 have the same structure, the left slide rail 5 and the right slide rail 6 have the same structure, the left rocker arm 3 includes a rocker arm body 7, a clamp body 8 is provided at the left end of the rocker arm body 7, a rack 9 used in conjunction with the gear set is provided at the right end of the rocker arm body 7, and at least two slide buckles 10 slidably engaged with the left slide rail 5 are provided at the bottom of the rocker arm body 7.

[0034] The gear set includes a driving gear 11 as a main body. The center of the driving gear 11 is installed at the output end of the driving motor 2. The left and right sides of the driving gear 11 are respectively connected with driven wheel groups. An arc protrusion 12 used in conjunction with the rocker arm assembly is provided at the upper edge of the driving gear 11. A driving external tooth 13 used in conjunction with the driven wheel group is provided at the lower edge of the driving gear 11. The remaining edges of the driving gear 11 are all smooth arcs.

[0035] The driven wheel set includes a transition gear 14 and a transmission gear 15. The transition gear 14 is meshed with the driving outer teeth 13 and the transmission gear 15 respectively, and the transmission gear 15 is meshed with the rocker arm assembly.

[0036] The switch assembly includes a driving micro switch 16, and a driven micro switch 17 is respectively provided on the left and right sides of the driving micro switch 16. The trigger end of the driving micro switch 16 is triggered by the arc protrusion of the driving gear 11, and the trigger end of the driven micro switch 17 is triggered by the rocker arm assembly.

[0037] The control method described:

[0038] 1. The inverter has a serial communication function inside. Under normal conditions, the mode conversion switch connects the host computer, the inverter and the motor into a loop. At this time, the speed command of the motor is set by the host computer.

[0039] 2. The host computer sends the motor speed command to the inverter, and then the host computer controls the inverter to perform frequency conversion processing.

[0040] 3. After the frequency conversion process, the inverter will send the output frequency to the motor for speed change processing.

[0041] 4. When encountering an emergency situation and needing to manually adjust the motor speed, the user can operate the mode conversion switch to connect the manual control mechanism, inverter and motor into a circuit.

[0042] 5. The user can adjust the speed gear of the motor by manually turning the rotary switch.

[0043] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A frequency converter with speed setting switching mode in an emergency state, comprising a neutral line N, a live line L, a frequency converter and a motor, characterized in that: The output end of the frequency converter is electrically connected to the motor, the input end of the frequency converter is electrically connected to the output end of the mode conversion switch, the input end of the mode conversion switch is electrically connected to the output end of the host computer and the output end of the manual control mechanism respectively, the power end of the host computer is electrically connected to the neutral line N and the live line L respectively, and the power end of the manual control mechanism is electrically connected to the neutral line N and the live line L respectively; the mode conversion switch comprises a base (1), a control chip is provided above the base (1), a rocker assembly and a drive motor (2) are provided on the base (1), the rocker assembly and the drive motor (2) are driven by a gear set, the rocker assembly is movably connected to the base (1), a switch assembly for adjusting the rocker assembly is provided next to the gear set, the output end of the control chip is electrically connected to the control end of the drive motor (2), and the input end of the control chip is electrically connected to the output end of the host computer and the output end of the manual control mechanism respectively; Control method: The inverter has a serial communication function inside. Under normal conditions, the mode conversion switch connects the host computer, the inverter and the motor into a loop. At this time, the speed command of the motor is set by the host computer. The host computer sends the motor speed command to the inverter, and then the host computer controls the inverter to perform frequency conversion processing; After the frequency conversion process, the inverter will send the output frequency to the motor for speed change processing; When encountering an emergency and needing to manually adjust the motor speed, the user can operate the mode conversion switch to connect the manual control mechanism, the inverter and the motor into a circuit; The user can adjust the speed gear of the motor by manually turning the rotary switch.

2. The frequency converter with speed setting switching mode in emergency state according to claim 1, characterized in that: The manual control mechanism includes a rotary switch, a resistor R1, a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2, wherein pin 1 of the rotary switch is electrically connected to pin 1 of the inductor L1, pin 2 of the rotary switch is electrically connected to pin 2 of the inductor L1, pin 3 of the rotary switch is electrically connected to pin 3 of the inductor L1, pin 4 of the rotary switch is electrically connected to pin 4 of the inductor L1, pin 5 of the rotary switch is electrically connected to one end of the resistor R1 and one end of the capacitor C1 respectively, and the The other end and the other end of the capacitor C1 are respectively electrically connected to pin 1 of the inductor L1, pin 1 of the inductor L1 is electrically connected to one end of the inductor L2, pin 4 of the inductor L1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C2 is electrically connected to the other end of the inductor L2, the other end of the inductor L2 is electrically connected to the No. 2 signal input terminal, the other end of the capacitor C2 is electrically connected to the neutral line N, pin 7 of the rotary switch is electrically connected to the live wire L, and pin 8 of the rotary switch is electrically connected to the motor.

3. The frequency converter with speed setting switching mode in emergency state according to claim 1, characterized in that: The rocker arm assembly comprises a left rocker arm (3), a right rocker arm (4), a left slide rail (5) and a right slide rail (6); the left slide rail (5) and the right slide rail (6) are respectively fixed to the left and right ends of the base (1) by bolts; the left rocker arm (3) and the right rocker arm (4) are respectively slidably connected to the left slide rail (5) and the right slide rail (6).

4. The frequency converter with speed setting switching mode in emergency state according to claim 3, characterized in that: The left rocker arm (3) and the right rocker arm (4) have the same structure, the left slide rail (5) and the right slide rail (6) have the same structure, the left rocker arm (3) comprises a rocker arm body (7), a clamp body (8) is provided at the left end of the rocker arm body (7), a rack (9) used in conjunction with a gear set is provided at the right end of the rocker arm body (7), and at least two slide buckles (10) slidably engaged with the left slide rail (5) are provided at the bottom of the rocker arm body (7).

5. The frequency converter with speed setting switching mode in emergency state according to claim 4, characterized in that: The gear set comprises a driving gear (11) as a main body, the center of the driving gear (11) is mounted on the output end of the driving motor (2), the left and right sides of the driving gear (11) are respectively gear-connected with a driven wheel set, an arc-shaped protrusion (12) for use with a rocker arm assembly is provided at the upper edge of the driving gear (11), and a driving outer tooth (13) for use with the driven wheel set is provided at the lower edge of the driving gear (11), and the remaining edges of the driving gear (11) are all smooth arcs.

6. The frequency converter with speed setting switching mode in emergency state according to claim 5, characterized in that: The driven gear set comprises a transition gear (14) and a transmission gear (15); the transition gear (14) is meshed with the driving outer teeth (13) and the transmission gear (15) respectively; and the transmission gear (15) is meshed with the rocker arm assembly.

7. The frequency converter with speed setting switching mode in emergency state according to claim 5, characterized in that: The switch assembly comprises a driving micro switch (16), a driven micro switch (17) being respectively arranged on the left and right sides of the driving micro switch (16), a trigger end of the driving micro switch (16) being triggered by transmission with an arc-shaped protrusion of the driving gear (11), and a trigger end of the driven micro switch (17) being triggered by transmission with a rocker arm assembly.

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