7.8 Electrical Maintenance
Check the appearance of the electrical connections and follow the steps below.
• Switch off the VRC1 unit and then switch off the power input during the equipment maintenance.
Switch off the equipment power unless the testing devices need power.
• Conduct overall electrical insulation test: find out the non-insulated contacts and rectify them with
proper insulation covering.
• Check if unplug the power cord during the test because high voltage may damage the control
components.
• Clean the dust from the electrical panel and control panel boards by using a brush or blowing low
pressure dry compressed air.
• Properly fasten all the electric connection terminals.
• Check that the sockets and plugs are in good condition. Replace the loose ones with new sockets and
plugs.
• If the power cables are damaged, the cables must be replaced by professional personnel to avoid any
non-standard installation practices.
7.9 Controller Connections Maintenance
Check the appearance of the controller and follow the steps below.
• Check the appearance of the power module and measure the output voltage.
• Check whether the surface of the control interface board, control board, temperature NTC and
electronic expansion valve control board show any signs of aging or wear and tear.
• Clean up dust and dirt from the electrical control components and control board with a brush using an
electronic dust cleaning agent.
• Check and fasten the input and output connectors of the control interface boards, including the
control board, interface board, temperature NTC, and electronic expansion valve control board.
• Check whether the contact and connection of the fan power cable, signal cable, and rotating speed
feedback signal cable are firmly fixed.
• Check whether the interconnection terminals between the control interface board and the
temperature or pressure sensor are firmly connected. If they are loose, faulty or have a bad
connection immediately replace the interconnection terminal.
• Replace the faulty electrical components such as the control fuse (or air breaker) and control board.
• Use a high-precision temperature measurement meter to measure and calibrate the reading of the
temperature sensor.
• Adjust the set points. Check the motion of each functional component according to the control logic.
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