12. Safety Instructions on Service
12-1)
Wire connector on the cabinet door.
12-2)
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
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