Basic Installation and Operation Guide
JK 400 Series Fixed Controllers
TOSHIBA
20
b. Handle Interlock
Two mechanical interlocks are provided to prevent operating the switch
handle improperly.
The
first interlock prevents moving the handle from OFF to ON unless the
compartment door is closed (
Fig. 3
1).
The second interlock prevents the switch handle from being moved in
either direction unless the contacts of the vacuum contactor are open
(
Fig. 3
2).
Fig. 31 Handle Interlock to Door
c. Vacuum Contactor Interlock
The vacuum contactor is mechanically interlocked to prevent it from
closing unless the switch handle is in the fully ON or fully OFF
position. The interlock shown in
Fig. 3
2 provides this function.
If the switch handle is in an intermediate position, and a closing
signal is given to the contactor, it is mechanically prevented from
operating.
Fig. 32 Handle Interlock to Vacuum
Contactor
