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Appendix
ⅠⅠ
(Reference for circuit diagnostics)
Ref.1) Wire connector on the cabinet door.
Ref. 2) How to check relay failure
Div. of contact
Voltage at both terminal of coil and trigger
Both terminals of contact
Resistance value
3-contact
terminal
Relay
0Ω (Short) -> Normal
∞Ω (Open) -> Normal
∞Ω (Open) -> Normal
0Ω (Short) -> Normal
0Ω (Short) -> Normal
∞Ω (Open) -> Normal
About 4-5
㏀
(Short) -> Norma
l
∞Ω
(Open) -> Normal
Between C and NO
Between C and NC
Between C and NO
Between C and NC
Between both terminals of contact
Between both terminals of contact
Between both terminals of contact
Between both terminals of contact
DC 12V (Working Condition)
DC 0V (Stop Condition)
∼ DC 12V (load working condition)
∼DC 0V (load stop condition)
∼DC 12V (load working condition)
∼DC 0V (load stop condition)
2-contact
terminal
Relay
SSR
Disconnect the connector of the main PCB
CN70 and CN71, then check the follows :
1. Measure the voltage at both terminals of a coil and
determine if the relay is working.
2. Measure the voltage at both terminals of a trigger and
determine if SSR is working.
3. Measure the resistance at both terminals of a load
contact, and determine if there is an error in voltages of
coil and trigger.
Note) NC -> Normally Close (C terminal and ON terminal)
NO -> Normally Open (C terminal and Open terminal)
C -> Common Terminal