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Basic Installation and Operation Guide
Power Fuses
The power fuses supplied in Toshiba JK 400 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. 44a) should, however, be periodically checked
and maintained within a range of 4-6 ft-lbs.
Check the condition of the back stab terminals on the cartridge for
any signs of damage or discoloration (Fig. 44b). 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.
If there is any excessive build-up of dirt or other foreign material,
wipe clean and lubricate with a light coat of Toshiba B9 grease,
making sure that no grease gets on the insulated fuse housing.
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-5HA/7HA vacuum contactor
are provided in a separate publication, number
VF010H08A/VF00W104. 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
CAUTION
1 meter (3.3 feet) away from the contactor
during high-potential tests.
Fig. 46 Angled Barrier In
Front of The Isolation Switch
TOSHIBA
JK 400 Series Fixed Controllers
Fig. 44a Checking Power Fuse
Clamping Bolt Torque
Fig. 44b Checking Stab on Power
Fuse Cartridge
Fig. 45 Fuse Barrier Placement
30
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