Cause analysis of overcurrent trip
(1) When restarting, it will trip as soon as the speed is increased. This is a very serious manifestation of overcurrent.
The main reasons are:
1) Short circuit on the load side
2) The working machine is stuck
3) The inverter tube is damaged
4) The starting torque of the motor is too small, the drag system can not turn
(2) It does not trip immediately when restarting, but trips during operation
Possible causes are:
1) The speed-up time setting is too short
2) The speed-down time setting is too short
3) Large torque compensation setting causes excessive no-load current at low speed
4) Improper setting of the electronic thermal relay, the operating current is set too small, causing misoperation
Cause analysis of voltage trip
(1) Overvoltage trip, the main reasons are:
1) The power supply voltage is too high
2) The speed-down time setting is too short
3) During the speed reduction process, the discharge unit of the regenerative brake does not work well
a. Too late to discharge, should increase the external braking resistor and braking unit
b. The discharge branch fails, and it is not actually discharged
(2) Undervoltage trip, the possible reasons are:
1) The power supply voltage is too low
2) Power failure
3) Rectifier bridge failure
Analysis of the reason why the motor does not rotate
(1) Improper function preset
1) The upper limit frequency conflicts with the highest frequency or the basic frequency and the highest frequency setting
2) When using external reference, the selection of "keyboard reference / external reference" is not preset
3) Other unreasonable presets
(2) When using external reference, there is no "start" signal
(3) Other reasons:
1) The machine is stuck
2) The starting torque of the motor is not enough
3) Circuit failure of the inverter
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