Vertiv | Liebert XDH | User Manual
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System Operation And Maintenance
7.3.System Diagnosis Testing
The microprocessor controller supports the manual mode and provides diagnostic functions such as manually
enabling and disabling parts. Such functions can be used to detect states of the system functional parts, for
example, manual adjustment of the opening of the two-port water valve.
7.4.Electrical Connection Inspection
7.4.1.Electrical Maintenance
Check the appearance of the electrical connections and take actions according to the following procedures:
1.
Conduct overall electrical insulation test: find out the non-insulated contacts and rectify them with proper
insulation cover.
2. Clean the electrical panel and panel boards with a brush from dust or blow dry compressed air at low
pressure.
3. Properly fasten all the electrical connection terminals.
4. Check whether the sockets and plugs are in good condition. Replace the loose ones with new sockets and
plugs
5. If the power cables are damaged, professional personnel must replace the cables to avoid any non-standard
installation practices.
• Disconnect all the fuses or MCBs of the control part during test as the high supply voltage can damage the
control components.
7.4.2.Control Part Maintenance
Check the appearance of the control parts and take actions according to the following procedures:
1. Check the appearance of the power module and measure the output voltage.
2. Check whether the surfaces of the control interface board, control board, temperature and humidity sensor
board, fan fault detection board, and electronic expansion valve control board show any signs of aging or wear
& tear.
3. Use an electronic dust cleaning agent to clean dust and dirt from the electrical control components and
control board with a brush.
4. Check and fasten the input and output connectors of the control interface boards, including the control board,
interface board, temperature and humidity sensor board, fan fault detection board, and EEV control board.
