Manual Operation Check; Vacuum Interrupter Integrity; Insulation; Contact Erosion And Wipe - Eaton Cutler-Hammer DHP-VR Series Instructions For Installation, Operation And Maintenance

Step 3: Check that the top surface of the pantograph
channel is adjusted so the MOC operator pin on
the breaker is centered in the channel.

4-4 MANUAL OPERATION CHECK

Place the maintenance tool into the manual charge
socket opening and charge the closing springs with
about 36 up and down strokes of the handle. When
charging is complete, the closing crank goes over
"
center with an audible click
Discharged Indicator shows
NOTICE
If the springs are to be charged on a closed breaker,
no click is heard at the end of charging operation.
Discontinue charging and remove the maintenance
"
tool as soon as Charged" flag is fully visible.
Continued attempts to further charge may result in
damage to the mechanism.
Remove the maintenance tool.
Close and trip the breaker several times.

4-5 VACUUM INTERRUPTER INTEGRITY

Using a dry lint-free cloth or a paper towel, clean all the
insulating surfaces of the pole units. Conduct a vacuum
interrupter integrity check as described in Section 6-4.

4-6 INSULATION

Check breaker primary and secondary insulation per
Section 6-7.

4-7 CONTACT EROSION AND WIPE

Manually charge the closing springs and close the
breaker. Check contact erosion and wipe as described
in Section 6-5.

4-8 PRIMARY CIRCUIT RESISTANCE

Check the primary circuit resistance as described in
Section 6-8. The resistance should not exceed the
values specified. Record the values obtained for future
reference.
IB6513C80G
Courtesy of NationalSwitchgear.com
"
and the springs Charged /
" "
Charged .
For more information visit:

4-9 NAMEPLATE

Compare the breaker nameplate information with
switchgear drawings for compatibility. Breaker and
compartment code plates do match power ratings, but
do not match control voltages.

4-10 SNUBBER ADJUSTMENT

FOR ALL TYPE DHP HOUSINGS, THE ADJUSTMENT
STEPS OUTLINED IN THIS PARAGRAPH MUST BE
PERFORMED BEFORE INSTALLING A
REPLACEMENT DHP-VR CIRCUIT BREAKER.
FAILURE TO COMPLETE THESE STEPS COULD
RESULT IN EQUIPMENT DAMAGE AND/OR
IMPROPER OPERATION.
Before levering a breaker into any and all housings, the
snubber bolts must be adjusted as outlined in steps 1
and 2. Refer to Figures 3-3, 3-5 and 4-8 for reference
purposes. If a breaker is moved from one housing to
another, the procedure must be repeated for the new
housing.
Step 1: Measure the distance from the floor plate to
the underside of the current transformer shelf
on both sides of the housing in line with the
location of the snubber bolts on each side of
the breaker (Figure 4-8).
Step 2: Adjust the height of the top of the snubber bolt
to be between 0.0 and 0.031 (0.0 and 1/32)
inches below the measured height of the
current trans-former shelf and tighten the
locking nut.

4-11 ELECTRICAL OPERATIONS CHECK

After going through the above steps, the breaker is now
ready to be operated electrically. It is preferred that this
check be made with the breaker in the Test position in
the breaker compartment.
Since the Type DHP-VR Circuit Breaker is for use in
existing DHP Metal-Clad Switchgear, installation
procedures are similar. If it is necessary to reference
anything in the breaker compartment, refer to the
original instruction books supplied with the assembly.
Refer to Figures 3-2 through 3-5, depending upon the
voltage rating of the breaker, for any parts identification
required during these installation procedures.
www.EatonElectrical.com
Instruction Book
Effective: March 2007 Page 15
CAUTION