The unit does not restart automatically. To reset the alarm, the power supply must be switched Off for 20
minutes once motor is at standstill.
• Input power undervoltage detection:
If the utility power falls below 3ph/290VAC (typical value) for 5 seconds or longer, the motor is
switched Off, electronically, with no potential for separation, and the status relay is released.
When the utility voltage returns to a correct value, the motor restarts automatically.
• Phase failure recognition:
If one phase fails for 5 seconds or longer, the motor is switched Off, electronically, with no
potential for separation, and the status relay is released.
When all three phases return to correct values, the motor restarts automatically in 10 to 40
seconds.
The power supply for an external speed-setting potentiometer is protected against short-circuiting.
The motor is overload-protected via motor current limitation.
Vertiv | Liebert CRV Installer/User Guide | 80
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