Device for protecting internal brake resistor and servo driver
A servo drive and braking resistor technology, applied in the field of PLC control, can solve the problems of the servo drive being unable to work, the braking resistor not being protected, and the internal braking resistor being burned out.
Active Publication Date: 2016-04-06
深圳市合信自动化技术有限公司
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
When the braking output power is greater than the braking resistor’s withstand power, a fault prompt will be issued, but because the CPU main control circuit in the prior art cannot distinguish whether the current connection is an internal braking resistor or an external braking resistor
Therefore, there will be the following problems in actual operation: when the external terminal is connected to the internal braking resistor R1 but the parameter is selected to disable the protection function, the servo driver cannot recognize whether it is the external braking resistor or the internal braking resistor on the hardware. Therefore, the current braking resistor will not be protected according to the set parameters, so the internal braking resistor will be in danger of being unprotected, and the internal braking resistor will burn out when braking for a long time , when the internal braking resistor is damaged, the servo drive will be unable to work
Method used
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Embodiment Construction
[0026] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0027] Such as image 3 Shown is a schematic structural diagram of an embodiment of a servo drive provided by the present invention. In this embodiment, the servo drive 1 includes at least:
[0028] Bus rectifier circuit, its input terminal is connected with three-phase AC power supply (U, V, W phase power supply), and the two-phase DC power obtained after rectifying the three-phase AC power supply is output to a bus filter capacitor C1, wherein the two-phase The DC power is output in the form of P bus (positive pole) and N bus (negative pole);
[0029] The bus voltage sampling circuit is connected in parallel with the bus filter capacitor C1, and is used to sample and detect the voltage at both ends of the bus filter capacitor C1;
[0030] An internal braking resistor, one end of which is connected to the P bus of the two-phase DC power supply, and ...
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The invention discloses a device for protecting an internal brake resistor. The device is connected in front of an inversion module of a servo driver. The device comprises at least one shunting resistor and an optocoupler, wherein the first end of the shunting resistor is connected to a P bus; the first input end of the optocoupler is connected to the second end of the shunting resistor, the second input end of the shunting resistor is connected to the first end of the internal brake resistor, the second end of the internal brake resistor is connected onto the P bus, the first output end of the optocoupler is grounded, and the second output end of the optocoupler is connected to a high level through a pull-up resistor. The device further comprises a brake audion, wherein the emitting electrode of the brake audion is connected to an N bus, the collector electrode of the brake audion is selectively connected to the second end of the internal brake resistor or the second end of an external brake resistor, the first end of the external brake resistor is connected onto the P bus, and the base electrode of the brake audion is used for receiving brake control signals. The invention also discloses the servo driver. Through the implementation of the device and the servo driver, the internal brake resistor can be protected in a forced manner when external terminals are detected to be connected to the internal brake resistor.
Description
technical field [0001] The invention relates to the field of PLC control, in particular to a device for protecting an internal braking resistor and a servo driver. Background technique [0002] In the field of control using PLC (ProgrammableLogicController, programmable logic controller), servo drives are often used. Among them, the servo drive includes a control module and a drive module, and the drive module generally includes an input circuit, a rectifier circuit, a bus bar, a bus bar capacitor and a braking resistor, an inverter, and an output terminal circuit. [0003] Such as figure 1 and figure 2 As shown, the servo drive will have an external terminal for selecting the internal braking resistor (R1) or external braking resistor (R2). Whether the current servo drive chooses an internal braking resistor or an external braking resistor is determined by the external wiring, and Generally, mainstream servo drives can be parameterized to determine whether to protect th...
Claims
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IPC IPC(8): H02H7/00
CPCH02H7/00
Inventor 王精
Owner 深圳市合信自动化技术有限公司