Eaton COOPER POWER Series Maintenance Instructions Manual page 16

Types H, 4H, and V4H maintenance instructions
2. Disconnect the long bushing lead from one side of the
interrupter structure.
3. Disconnect the coil lead and bypass gap from the other
side of the interrupter structure.
4. Remove the two hex-head bolts that secure the
arc- interrupting structure to the solenoid frame and
remove the structure.
5. Holding the moving contacts open, loop a light cord to
the contact spring at the end farthest from the cross-blast
structure (see Figure 15) and unhook both springs. Do not
stretch the springs any further than required for removal.
Figure 14 . Releasing contact springs
6. Unhook the torsion spring and remove the two
roundhead screws, lockwashers, flat washers, and pivot
bearings to free the moving contact arm assembly.
Remove the assembly.
Cross-
blast
tube
Exhaust
chamber
Figure 15 . Partially assembled contact-box
12
MAINTENANCE INSTRUCTIONS MN280052EN May 2017
7 . Remove the four hex nuts, lockwashers, and flat
washers that secure the exhaust and generating
chambers to the contact-box assembly and remove
both chambers by sliding them off the mounting bolts.
Figure 16 shows the exhaust chamber removed from
the contact-box assembly. Note the position of the
insulating spacers.
8. Remove the cross-blast tube. Remove and save the
fiber dowel before discarding the tube.
To reassemble the contact-box assembly
1. Assemble the fiber dowel to the new cross-blast tube
and install the tube into the contact box. Make sure the
dowel is secured in the notch on the side plate.
2. Assemble the interrupting chambers and the moving
contact assembly by reversing Steps 5, 6, and 7 above.
N otee:
Contact Arm
Assembly
Screws
To install the contact-box assembly
N otee:
1. Lock in the operating mechanism by closing the yellow
operating handle.
Torsion 2. Install the contact-box assembly and secure with the
Spring
two hex-head bolts.
87874KMA
3. Reconnect the coil lead and bypass gap to the
generating chamber.
4. Reconnect the long bushing lead to the exhaust chamber.
5. Manually open and close the mechanism several times
to check the operation of the arc-interrupter assembly.
Vacuum contact-box assembly, type V4H recloser
Current is generally interrupted in less than 1/2 cycle by
Insulating
the vacuum interrupter. Circuit opening is accomplished
spacers
by a spring-loaded contact assembly operating in a
high-vacuum chamber.
When the vacuum interrupter is to be replaced because
Generating
chamber of contact wear, replace the entire contact-box assembly.
If, however, replacement is required because of vacuum
interrupter failure (physical damage, loss of vacuum), the
vacuum interrupter only can be replaced. See Figure 17 .
Spacers (add
washers at
spacers if
necessary)
87875KMA
After reassembling the contact-box assembly, check
for completely free entry of the moving contacts
into the stationary-contact housing. Use No. 10
plain brass washers to adjust the position of the
stationary-contact housing with respect to the
moving contact (see Figure 14).
If further maintenance is to be performed, do not
install the arc-interrupting structure.