Faults And Check Points - Mitsubishi Electric FREQROL HC Instruction Manual

3.1.2 Faults and check points

Fault
Unit does not operate properly.
POWER lamp is not lit.
Charge lamp is not lit.
Reactors become unusually hot.
Inverter is inoperative.
Reactors generate unusual noise.
Checking the connections
• Check that wiring is correct.
• Check that proper power supply voltage is applied.
• Check that phase sequence is correct.
When phase sequence is correct, check that terminals
SOF-SD or terminals RES-SD are connected.
Checking the connections
• Check that connections are correct.
• Check that control circuit terminals R, S, T are wired correctly.
• Check for damaged resistor in the external box.
Checking the connections
• Check that connections are correct.
• Check that main circuit terminals R4, S4, T4 are wired correctly.
Checking the connections
• Check that the reactors 1 and 2 are connected in correct sequence.
Checking the settings
• Check that the parameter setting of the inverter is correct. (Since the
parameter setting method varies with the inverter series, refer to the inverter
instruction manual.)
Check that phase sequence is correct.
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Check Point