Vertiv Liebert CRV Plus - Self-Diagnosing Functions; Maintenance of Electrical Control Utilities

Vertiv | Liebert CRV+ | User Manual 71
Components
Item
Remark
once a week)
Check the voltage regulating function of the rotation speed
controller
The temperature switch is set at the required position
The refrigerant pipes are properly supported
Check and fasten the circuit connections
Refrigeration system
Check the suction pressure
Check the discharge pressure
Check the refrigerant pipes
Check the moisture condition in the system through the
sight glass
Heating system
Check the re-heater operation
Check the erosion situation of the components
Check and fasten the circuit connection
Electric control part
Check the fuse and the MCB
Check and fasten the circuit connections
Check the control program
Check the contactor action
3.2.3 Self-Diagnosing Functions
The micro controller has a built-in diagnostic function that helps to turn on/off the components and check
their functionality.
3.2.4 Maintenance of Electrical Control utilities
In this section, the following processes will be discussed in brief, namely-
 Maintenance of Electric parts
 Maintenance of Control System
 Water Leak detector
Maintenance of Electric Parts
Visual checks and handling needs to be carried out to check the correctness of electrical connections for
the following items:
 Conduct the electrical insulation test on the system to find out bad electrical connections and
contacts. Disconnect all the fuses and MCBs of the control part during the test as high voltage
from the insulation test could damage the components.
 Check the contactors prior to powering on the unit to ensure that the contactors can hold and
un-hold freely.
 Clean the electrical and control components off dust with brush or dry compressed air.
 Check the closing of contactors for arcs or signs of burning. Replace the contactors, if required.
 Fasten all the electrical connection terminals
 Check that the sockets and plugs are in good condition. Replace the contactors, if required.
 If the power cables are damaged, get them replaced by a qualified/certified electrician.