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TROUBLESHOOTING AND MAINTENANCE
6 TROUBLESHOOTING AND MAINTENANCE
This chapter explains:
Check and prepare the inverter before power-up.
Power-up the inverter and check the result.
6.1 OPERATION OF PROTECTIONS, FAULTS AND ALARMS
When a protection or fault actuates, the result is:
The PWM pulses are blocked.
Indication on the display of the fault/protection description and code.
The STATUS “LED” starts flashing red.
Deactivation of the digital outputs set for the function “without fault”.
Activation of the digital outputs set for the function “with fault”.
Writing of essential data to the inverter internal memory:
- Speed references via HMI and Electronic Potentiometer if the “Speed backup” function is enabled.
- Code of the protection, fault or alarm occurred.
- Status of the motor overload function integrator.
- Status of the hours enabled ( D3.2) and energized ( D3.1) counter.
For the inverter to return to normal operation right after the actuation of a protection or fault, it is necessary
to reset it, which can be done as follows:
Pressing the HMI red key (manual reset).
Automatically by setting C7.9.1 (auto-reset).
Via digital input set for reset.
Switching off the power supply and switching it back on (power-on reset).
When an alarm actuates, the result is:
Indication on the display of the alarm description and code.
The STATUS “LED” changes to yellow.
The PWM pulses are not blocked (the inverter is still operating).
58 | CFW900
