The fault diagnosis and maintenance methods of the FANUC analog AC speed control unit are similar to those of the DC speed control unit. The analysis and processing methods for "CRT fault maintenance without alarm display" are the same as those of the DC PWM speed control unit.
1) VRDY light does not turn on. The VRDY light of the speed control unit does not light up, indicating that the speed control unit is not ready for the main circuit breaker of the speed control unit.
2) HV alarm. HV is the overvoltage alarm of the speed control unit, and when the indicator light is on, it means that the input AC voltage is too high or the DC bus is overvoltage.
3) HC alarm. HC is the overcurrent alarm of the speed control unit, and the indicator light is on to indicate the overcurrent of the speed control unit.
4) OVC alarm. OVC is the overload alarm of the speed control unit, and the indicator light is on to indicate that the speed control unit has been overloaded, and the possible reason is the overcurrent of the motor or the poor connection of the encoder.
5) LV alarm LV is the alarm of the voltage of the speed control unit is too low, and the indicator light is on to indicate that the various control voltages of the speed control unit are too low.
6) TG alarm. TG is the speed control unit disconnection alarm, and the indicator light is on to indicate that the servo motor or pulse encoder is disconnected, the connection is poor, or the speed control unit is set incorrectly.
7) DC alarm. DC is the DC bus overvoltage alarm, and the related reasons are mainly the DC bus chopper Q1, braking resistance RM2, diode and external braking resistor defects. Attention should be paid to the maintenance, if the DC alarm occurs at the moment when the power is turned on, the power supply can not be turned on and off frequently, otherwise it is easy to cause damage to the braking resistor.
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FANUC FAQ - [ROBOSHOT] bubbles appear on the surface of the product
Dry the raw material thoroughly and increase the back pressure
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Whether the robot control cabinet and the body can be used interchangeably
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The most common problem with Fanuc power alarms
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