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6. Interlock switches
• You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter.
• The switch operation is checked by zero/unlimited.
the meter should indicate zero resistance.
• The sequence of check is interlock monitor switch; primary and secondary interlock switched check.
1) In case of interlock monitor switch check
Condition
1) Door is opened.
2) Common terminal of the monitor switch disconnected.
2) In case of primary interlock switch check.
Condition
1) Door is closed.
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POWER
SUPPLY
CORD
PRIMARY
INTERLOCK SWITCH
OHHMETER
INTERLOCK
MONITOR
SWITCH
POWER
SUPPLY
CORD
PRIMARY
INTERLOCK SWITCH
INTERLOCK
MONITOR
SWITCH
OHHMETER