Vertiv Liebert CRV Plus - Troubleshooting

Vertiv | Liebert CRV+ | User Manual 75
3.2.10 Troubleshooting
Troubleshooting is to be performed by the trained and qualified service personnel. However, the
checklists have been provided just for reference purposes.
 Certain circuits carry lethal voltages. Only professional technicians are allowed to maintain
the machine. Extreme care and caution is required while troubleshooting online.
 If jumpers are used for troubleshooting, remember to remove the jumpers after the
troubleshooting failing which the connected jumpers may bypass certain control functions
and increase the risk to the equipment.
Listing 3.8
Troubleshooting the fan
Symptom Possible causes Items to be checked
EC fan can’t
be started
Power Supply
Disconnected
Check whether the fan MCB is closed; If the MCB is closed,
check if the power voltage of each phase is normal
Control board faulty
Check J15 on the micro-processing control board, to ascertain
whether the control board is faulty or functions correctly
Fan power module
faulty
Check the alarm lamp on the fan power module to ascertain
whether it is faulty or functions correctly
EC fan faulty
Check L1, L2, and L3 of the fan against power failure, phase
loss, and low voltage
Check whether the analog output is within the specific range
of 0 ~ 10Vdc as per the requirement
Check whether the motor is clogged (due to large current)
Check whether the motor is too hot
Check for Hall failure
 If the previous three problems (i.e. Motor Clogging, Hot Motor, or Hall failure) occurs, the
motor can restore normal operation after the faults are cleared.
 If the motor is too hot, cut off the fan power; after the motor cools down, power on it again
for recovery.
 In the event of a hall failure, factory service is required to fix the issue.