24
SAFETY INTERLOCK CONTINUITY TEST
• Disconnect the oven from the power supply.
• You can test continuity of safety interlocks and monitor switches by using switch tester or ohmmeter.
• The switch operation is checked by the lamp on/off of resistance zero/unlimited.
• The sequence of check is interlock monitor switch, primary and secondary interlock switches checking.
• Make circuits like Fig. a, Fig. b, and Fig.c for tests.
1) In case of interlock monitor check.
(Lamp on or zero resistance)
Condition : 1) Door is opened.
2) Common terminal of the monitor
switch disconnected.
3) In case of secondary interlock switch.
(Lamp on or zero resistance)
Condition : 1) Door is closed.
2) In case of primary interlock check.
(lamp on or zero resistance)
Condition : 1) Door is closed.
* (Schematic diagram fo S/W tester)
PRIMARY
INTERLOCK S/W
INTERLOCK
MONITOR
S/W
SECONDARY
INTERLOCK
S/W
NC
NO
COM
(ohmmeter)
POWER
SUPPLY
CORD
PRIMARY
INTERLOCK S/W
INTERLOCK
MONITOR
S/W
SECONDARY
INTERLOCK
S/W
NO
NC
COM
(ohmmeter)
POWER
SUPPLY
CORD
LAMP
CONTACT
LEAT
SECONDARY
INTERLOCK
S/W
COM
NO
NC
PRIMARY
INTERLOCK
S/W
POWER
SUPPLY
CORD
INTERLOCK
MONITOR
S/W
BATTERY
SW
(ohmmeter)
