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Okuma OSP Controller
Overheat/Thermal · Intermediate
Okuma OSP Alarm A 1488 - PSCB Overheat
The cam-axis drive motor or its servo amplifier has overheated. Either the motor's thermal protector tripped from sustained overcurrent, or the amplifier heat sink exceeded its temperature limit.
1488
Okuma OSP Alarm A 1488 - PSCB Overheat
PSCB Overheat
The cam-axis drive motor or its servo amplifier has overheated. Either the motor's thermal protector tripped from sustained overcurrent, or the amplifier heat sink exceeded its temperature limit.
Common Causes
- Cam-axis motor thermal protector tripped due to overcurrent (overload, binding axis, excessive duty)
- Servo amplifier heat sink overheated (blocked cooling, fan failure, high ambient temperature)
Troubleshooting Steps
- 1Stop the machine and let it cool: turn the power off, wait several tens of minutes, then turn it back on as the manual directs.
- 2While cooling, check for the cause of motor overcurrent: verify the cam axis moves freely with no mechanical binding or obstruction.
- 3Check the servo amplifier cooling path — clean the heat sink and air filters and confirm any cooling fans run.
- 4Verify the machine's ambient temperature and cabinet ventilation are adequate before returning to heavy cam-axis duty.
- 5If the overheat recurs under normal load, record the alarm number and contact Okuma service.
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Always verify with your machine manual or a certified technician before performing service procedures.