
3.TROUBLESHOOTING AND ACTION TROUBLESHOOTING B-65285EN/03
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3.1 POWER SUPPLY MODULE (PSM, PSMR)
If an alarm occurs, in the STATUS display, the ALM LED lights red,
and the one-digit 7-segment display indicates an alarm code or warning
code.
The meaning of each warning code is the same as that of the
corresponding alarm code. If a warning code is displayed, an alarm
condition will occur in a certain period of time. The PSM or PSMR
remains operable while the warning code stays displayed.
Example of an alarm Example of a warning
code display code display
3.1.1 Alarm Code 1 (PSM)
For the PSM-5.5i to PSM-15 i
(1) Meaning
The main circuit power module (IPM) has detected an abnormal
condition.
(2) Cause and troubleshooting
(a) Control supply voltage decrease of the power module (IPM)
→ Replace the power unit.
(b) Input supply voltage imbalance
→ Check the input power supply specification.
(c) The specification of the AC reactor does not match the PSM
in use.
→ Check the PSM and the specification of the AC reactor.
(d) IPM failure
→ Replace the IPM.
For the PSM-15i to PSM-37i
(1) Meaning
Overcurrent flowed into the input of the main circuit.
(2) Cause and troubleshooting
(a) Input supply voltage imbalance
→ Check the input power supply specification.
(b) The specification of the AC reactor does not match the PSM
in use.
→ Check the PSM and the specification of the AC reactor.
(c) IGBT defective
→ Replace IGBT.