
3. TROUBLESHOOTING
B-65165E/02 TROUBLESHOOTING AND ACTION
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3.1.3 Power Supply Module (PSMR)
When an alarm is issued, the one-digit 7-segment LED indicates an
alarm code.
Indicates an alarm code (02 or above).
3.1.3.1 Alarm code 2
(1) Meaning
A cooling fan for the control circuit has stopped.
(2) Cause and troubleshooting
(a) Cooling fan for the control circuit broken
Check whether the cooling fan for the control circuit rotates
normally.
→ Replace it.
3.1.3.2 Alarm code 4
(1) Meaning
In the main circuit, the DC voltage (DC link) has dropped.
(2) Cause and troubleshooting
(a) A small power dip has occurred.
→ Check the power supply.
(b) Low input power supply voltage
→ Check the power supply specification.
(c) The main circuit power supply may have been switched off
with an emergency stop state released.
→ Check the sequence.