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Fanuc Alpha Servo drive alarms
Fanuc Servo amplifier Alarms
These alarms are found on the Fanuc Alpha servo drives, please check these alarms to enable us to complete a CNC repair to your machine tool quickly.
Alarm LED display Likely Cause, (for further information about these alarms please call or email us )
1 Inverter: internal cooling fan stopped
2 Inverter: control power supply under voltage
5 Inverter: DC link under voltage
6 Inverter: overheat
F Inverter: cooling fan stopped of the radiator
P Communication error between amplifier and module
8 Inverter: IPM alarm (L axis)
9 Inverter: IPM alarm (M axis)
A Inverter: IPM alarm (N axis)
8 Inverter: IPM alarm (OH) (L axis)
9 Inverter: IPM alarm (OH) (M axis)
a Inverter: IPM alarm (OH) (N axis)
b Inverter: DC link current alarm (L axis)
c Inverter: DC link current alarm (M axis)
D Inverter: DC link current alarm (N axis)
For the older ac servo drives the alarm led lights on the servo PCB when in trouble. These alarms usually follow a 401 or 403 alarm on Fanuc system 0 controls and have the following meanings.
These alarms can also be checked in diagnostic 720-724 on system 0.
(The bits are referenced as 76543210)
OVL Overload alarm 720-724 bit 7
LVAL Low voltage alarm 720-724 bit 6
OVC Over current alarm 720-724 bit 5
HCAL high current alarm 720-724 bit 4
HVAL High voltage alarm 720-724 bit 3
DCAL DC alarm 720-724 bit 2
FBAL A wire disconnection alarm 720-724 bit 1
OFAL Overflow alarm 720-724 bit 0