87
5-16. Load Drive Circuit
5. Circuit Descriptions
1) The control of load in the system is accomplished by the main PCB.
2) Most of relays or SSRs can control compressor, refrigerator/freezer defrost heater, and
several option functions.
3) For compressor, #18 pin of micro processor signals High (5V). This signal inputs #5 pin
of IC3 and #14 of output terminal which have base and collector functions of IC3 turns
on and connects the GND. Relay 73 will be grounded through #14 of IC. Magnetic lines
will generate so that the second side of RY73 is activated and 115~230V is supplied to
the compressor. On the other hands, if #18 of micro processor turns Low(0V), #5 of IC3,
the current of RY 73 relay, and magnetic line will shut down in sequence. A contact
point in secondary side of Relay 73 is off. Finally compressor will stop.
4) The principles of other loads are the same as 3) item described.
SSR(Solid State Relay) is a kind of Relay.
Note
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