Toshiba JK Series - Interlocks; Control Power;Potential Transformers

Basic Installation and Operation Guide
JK Series 720 Controllers
TOSHIBA
32
Interlocks
Circumvent the handle interlock by pushing a screwdriver through the slot and operate the handle several times.
Turn off and lock out Primary and Control Circuit Power.
Check that the CPI electrical interlock (microswitch) operates each time the handle is moved. The CPI (control
power interlock) should close approximately 10° before the handle reaches the full ON position. As the handle
is moved from ON to OFF, the CPI switch should open by the time the handle has moved approximately 10° or
one inch (Fig. 48).
Refer to the GENERAL DESCRIPTION section for the location of the handle mechanical interlocks and the CPI
electrical interlock.
Fig. 48 Interlock Sequence Check
Control Power/Potential Transformers
Wipe off the surface of the transformers (Fig. 49).
Check the condition of the primary fuses and fuse clips. Check all screws
for tightness.
Fig. 49 Inspect Transformer(s)