Vertiv Liebert CRV4 Series User Manual

Vertiv | Liebert® CRV4 | User Manual 101
Troubleshooting
Chapter 9: Troubleshooting
Troubleshooting is to be performed by the trained and qualied service personnel. However, the checklists have
been provided just for reference purposes.
• Prior to operation and maintenance, the lethal voltage may be present in the equipment which can be
fatal. All notes, warnings, and cautions marked on the equipment as well as the ones mentioned in the
manual must be considered, otherwise, it may lead to injury and fatality.
• Extreme care and caution is required while troubleshooting on-line.
• Qualied and professional maintenance personnel are the one supposed to operate and handle the unit.
• 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
unit.
9.1. Troubleshooting of the Fan
The fan troubleshooting is described in Table 9-1.
Table 9-1 Troubleshooting of the Fan
Symptom Possible Causes Items to be Checked
EC fan cannot
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 specic range of
0 Vdc to 10 Vdc 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 o the fan power supply; after the motor cools down, power On it again for
recovery.
• In the event of a hall failure, factory service is required to x the issue.

Vertiv Liebert CRV4 Series Specifications

General

Brand	Vertiv
Model	Liebert CRV4 Series
Category	Air Conditioner
Language	English