Fanuc Alpha Power Supply Alarms
Fanuc Alpha Power Supply Module Alarms
CNC has put to together a simple alarm list. If an alarm / error occurred on your Fanuc alpha power module or later aiPS module. Then check the front of the unit looking at its 2 digit 7-bit displays which should indicate an alarm number / code. Once you have these details look below, then contact us and we will see if we can assist you either with a testing, repair or exchange part if it seems the Fanuc PSM, PSMi, PSMC, aiPS, aiR module is faulty.
Refer to the following alarm codes covering the FANUC 200VAC and 400VAC PS modules with model codes PSM, PSM HV, PSMR, aiPS, aiPS xxHV.
| Alarm Code | PSM alarm description |
| 1 | Overcurrent flowed into the input of the main circuit. |
| 2 | A cooling fan for the control circuit has stopped. |
| 3 | The temperature of the main circuit heat sink has risen abnormally. |
| 4 | In the main circuit the DC voltage (DC link) has dropped. |
| 5 | The main circuit capacitor was not charged with the specific time. |
| 6 | The control power supply voltage decreases. |
| 7 | In the main circuit the DC voltage at the DC link is abnormally high. |
| 8 | There is excessive short-term regenerative power |
| A | A cooling fan of external cooling has stopped. |
| H | Temperature of the regenerative resistor has risen abnormally. |
Certain alarms can be in combination with alarms on the SPM or aiSP module such as 1 & 30; 4 & 51, 5 & 33, 7 & 11; there are others but these are the most common. Refer too the decscriptions above. We do not offer the advice that an on site Fanuc trained maintenance engineer can.
Special Mention: AL.1 on ALPHA power supply module
Refer to the following alarm codes covering the following ALPHA i series models aiPS, aiR, aiPS HV of 200v and 400v. Part numbers start from A06B-6110, A06B-6120, A06B-6140, A06B-6150, A06B-62xx.
| Alarm Code | aiPS Alarm Description |
| 1 | Over current flowed into the input of the main circuit. |
| 2 | Cooling fan for the control circuit has stopped. |
| 4 | Main circuit the DC voltage (DC link) has dropped. |
| 5 | a. Input power supply is abnormal. b. Main circuit capacitor was not recharged within the specified time. |
| 6 | Control power supply voltage decreases. |
| 7 | Main circuit the DC voltage at the DC link is abnormally high. |
| A | Cooling fan of external cooling has stopped. |
Alarms 11, 30, 33 and 51 which present on the spindle amplifier if accompanied by a PSM alarm such as 7, 1, 5, 4 respectively then refer to those PSM / aiPS alarms above as they are combination alarms.
Fanuc America own troubleshooting Guide. Also Power supply module alarms at DNC; Fanuc specialists to Europe.
CNC are Fanuc specialists: Parts – Exchange – Repair – Test – Surplus
- Exchange -> Emergency breakdowns; swap the bad for the good immediately. Order Monday to Friday 9am to 4.30PM to ship same day!
- Repair -> Save money avoid paying deposit, keeping your own unit with known history. Current clean, inspect, repair and test turnaround 24-48 hours (normal).
- Surplus -> Either for stock critical parts or for drives that are not repairable or exchangeable due to burn outs, corrosion, etc.
Common Fanuc PSM and aiPS power supply modules that fault: A06B-6077-H111, A06B-6087-H115, A06B-6087-H145, A06B-6091-H175, A06B-6110-H037, A06B-6120-H018, A06B-6120-H075, A06B-6140-H015, A06B-6150-H030, A06B-6200-H026, A06B-6202-H026, A06B-6250-H018 and more. For complete listings visit Fanuc drives.
Contact us +1(434)971-1394 for more information on Fanuc ALPHA power supply module (PSM) and aiPS power modules and any of the alarms listed for your spindle unit or Fanuc drives.