Basic Installation and Operation Guide
JK Series 720 Controllers
TOSHIBA
Power Fuses
The power fuses supplied in Toshiba JK 720 ampere controllers
are of the bolt-in or clamp-in type, therefore overheating due to
loss of fuse clip pressure is not a problem. The tightness of the
fuse clamping bolts (Fig. 44) should, however, be periodically
checked and maintained within a range of 20-30 ft-lbs.
Check the power fuses for any signs of discoloration. A fuse
barrel which appears darker than others indicates overheating.
Possible causes of fuse overheating, other than load problems,
are misapplication (fuse current rating too small), loose fuse
connections, or a damaged fuse.
Fig. 44 Checking Power Fuse Clamping
Bolt Torque
Check the fuse barriers for cleanliness and proper positioning, as
shown in Fig. 45. There are three vertical barriers, two located
between adjacent fuses and a third between the right hand fuse
and the operator mechanism. A fourth angle-shaped barrier is
positioned in front of the isolation switch (Fig. 46).
Vacuum Contactor
Maintenance instructions for the HCV-6KAU vacuum contactor
are provided in a separate publication, number VF010H08A.
Contact the equipment supplier or the factory if this publication
is needed and was not provided with the equipment.
Radiation Exposure Hazard. X-Radiation
may cause illness or injury. Stay at least
1 meter (3.3 feet) away from the contactor
during high-potential tests.
Fig. 46 Angled Barrier In
Front Of The Isolation Switch
Fig. 45 Fuse Barrier Placement
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