Fault Finding on Fanuc Alpha Power Supply Modules (Fanuc PSM)
6077/6081/6087 range of Fanuc Alpha Power Supplies
A drive status alarm appears on the 7 segment display “-” refers to drive not ready (Waiting for e-stop signal to power up) “0” refers to drive powered up and OK Any other number or letter on this status display is an alarm
Fanuc Power Supply Alarms
AL-01 : Overcurrent in the Main Power Module.
AL-02 : Cooling Fan Stopped.
AL-03 : The temperature of the main circuit heat sink has risen abnormally.
AL-04 : The DC Voltage has dropped.
AL-05 : The main Capacitor was not recharged within the specified time.
AL-06 : The Input Power Supply is Abnormal.
AL-07 : In the main circuit the DC Voltage is abnormally high
A common alarm on installation of a new alpha power supply is an AL-05.
If you have this alarm it is worth checking the bus bar connector at the top of the power supply has all four screws in it.
The below pictures are taken from an A06B-6087-H126 Power Supply
It’s worth noting if any of the Fanuc Servo Drives or Fanuc Spindle Drive have alarms on whilst checking the power supply alarm
If you have a faulty alpha power supply or need help with one, Fanuc Power Supply Contact