Beckhoff AX8000 Series Operating Instructions Manual page 46

Technical description
Mains voltage
46 ───
P = Power supply
Power symbol lights up green:
The mains voltage is connected, and the DC link is charged.
Symbol flashes green:
The DC link is being charged / discharged.
Fast blinking: DC link voltage > 48 V
Slow flashing: DC link voltage ≤ 48 V
Power symbol lights up red:
Error.
Power symbol flashes red:
An error has occurred, but the DC link is being charged/discharged:
Fast blinking: DC link voltage > 48 V
Slow flashing: DC link voltage ≤ 48 V
EtherCAT and power symbol light up green:
The power supply module is ready to operate.
AX8000 Version: 1.1