Vertiv
™
| Liebert® XDC | User Manual
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6.3. System Troubleshooting Test
The microprocessor controller has a manual mode, which provides on-site troubleshooting functions for manually opening
and closing various components to detect the status of system functional components,
6.4. Electrical Connection Inspection
6.4.1.
Electrical Maintenance
1. Perform visual inspection and treatment to electrical connections according to the following items:
2. Electrical insulation test of the whole system: Find defective contacts and correct the defects. During the test, disconnect
the fuse or MCB of the control section to avoid damage to the control panel due to high voltage.
3. Statically check whether each contactor is flexible and jammed.
4. Use a brush or dry compressed air to remove dust from electrical and control components.
5. Check whether the contacts of the contactor are drawn for arcing and have burn marks. If it is serious, replace the
corresponding contactor.
6. Fasten the electrical connection terminals.
7. Check whether the fan’s quick-to-plug terminals are in good contact. If any looseness is found, replace the terminals.
8. If the power cord is damaged, in order to avoid danger, it must be replaced by a professional from the manufacturer’s
maintenance department.
6.4.2.
Control Maintenance
Perform visual inspection, simple function inspection and processing of the control part according to the following items:
1. Check the appearance of the transformer and check the output voltage.
2. Check the appearance of the terminal transformer and power supply module, and check the output voltage.
3. Check the control interface board, control board, temperature and humidity sensor board, fuse board and other surfaces
for obvious sign of aging.
4. Clean the dust and dirt on the electrical control components and control panel, and clean it up with a brush and
electronic dust remover.
5. Check and tighten the output and input plugs of the control interface board, including the connection between the
control board and the control interface board and the connection between the control interface board and each sensor.
6. Check the connection between the user cabling terminals (such as A/B, H/L, etc.) and the control terminal block.
7. Check the output connection of the control interface board to each contactor, and the input connection of the high
voltage switch, exhaust temperature sensor, high pressure sensor, etc. Pay special attentions to the high-voltage
switches and other plug-in terminals. If there is looseness, poor contact, failure, etc., they should be replaced immediately.
8. Replace the control fuse (or MCB), control board and other electrical components that have detected problems.
9. Check the specifications and aging conditions of the control cable or power cable of the main unit, and replace the cable
if necessary.
10. Adjust the setpoints, and detect the action of each functional component according to the control logic.
11. Simulate and detect the running status of the protection units such as the Vertiv™ Liebert® XDC unit.
12. Check whether the cabling and numerical display of each sensor are normal.
