
3. TROUBLESHOOTING
B-65165E/02 TROUBLESHOOTING AND ACTION
- 117 -
For PSM-15 to PSM-55, PSM-18HV to PSM-75HV
(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.
3.1.1.2 Alarm code 02
(1) Meaning
(a) A cooling fan for the control circuit has stopped.
(b) The control supply voltage has dropped.
(2) Cause and troubleshooting
(a) Cooling fan broken
Check whether the cooling fan rotates normally.
→ Replace it.
(b) Input voltage decrease
→ Check the power supply.
3.1.1.3 Alarm code 03
(1) Meaning
The temperature of the main circuit heat sink has risen
abnormally.
(2) Cause and troubleshooting
(a) Cooling fan for the main circuit broken
Check whether the cooling fan for the main circuit rotates
normally.
→ Replace it.
(b) Dust accumulation
→ Clean the cooling system with a vacuum cleaner or the
factory air blower.
(c) Overload
→ Examine the operating conditions.