During the operation of Heidelberg CD-102 four-color offset printing machine, it was found that the cooling system of the water tank was out of control, and it could not be cooled down according to the temperature set by the CP window (no fault display). Open the water tank electrical cabinet to check, and found that the power indicators of the REL2 and REL4 solid state relays in the circuit board are off, but the 8KZM relay that controls the compressor is still closed; then turn off the power and reset the cooling temperature of the tank. After the temperature drops to the preset position, the compressor is still working, causing the water refrigeration circulator to freeze and fail to work properly. It is found through measurement that the REL2 and REL4 relays are controlled by a temperature-sensing detector next to the compressor, and the compressor's 8KZM start relay is controlled by the REL2 and REL4 relays. The main cause of compressor out of control. So we refer to the parameters of the solid-state relay to find similar relays. After replacing the relays, start-up inspection and the cooling control works normally.
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