Mechanism Operated Cell (Moc) Switch Pantograph Adjustment; Manual Operation Check; Vacuum Interrupter Integrity; Insulation - Eaton DHP VR + Series Instruction Book

+
DHP-VR
+
VR-Series Replacement Circuit Breaker
Sttp 10e: Anytime an adjustment is made, confirm the new
compressed spring length (measured in the open position) is
recorded if different than the dimension in this instruction book.
Sttp 11e: After an adjustment is made, confirm that all nuts are
secured in place, prior to returning to service.
Sttp 12e: Re-install the circuit breaker front cover, making sure all
hardware is installed properly before returning to service.
5.3 MECHANISM OPERATED CELL (MOC) SWITCH
PANTOGRAPH ADJUSTMENT
Figurt 5.3. MOC Pantograph Adjustmtnt
ADJUST HEIGHT OF CHANNEL UNTIL THE MOC OPERATOR PIN
ON THE CIRCUIT BREAKER IS CENTERED IN THE CHANNEL
NOMINAL 7.38"
L C
*
*
PIVOT POINTS
CIRCUIT
BREAKER
FRONT
*
CIRCUIT BREAKER
COMPARTMENT FLOOR
m DANGER
FOR ALL CIRCUIT BREAKER COMPARTMENTS EQUIPPED WITH
MECHANISM OPERATED CELL (MOC) SWITCHES, THE STEPS OUTLINED
IN THIS PARAGRAPH MUST BE PERFORMED BEFORE INSTALLING A
REPLACEMENT DHP-VR + CIRCUIT BREAKER. FAILURE TO COMPLETE THESE
STEPS COULD RESULT IN DEATH, SEVERE PERSONAL INJURY, EQUIPMENT
DAMAGE AND/OR IMPROPER OPERATION.
Inspect the MOC pantograph in keeping with the following steps
and refer to Figure 5.3 for additional assistance.
Sttp 1: Check for excessive wear in the bearing surfaces of all
pivoting members.
Sttp 2: Check that the pantograph assembly is securely bolted
to the circuit breaker compartment and that there is no missing
hardware.
Sttp 3: Check that the top surface of the pantograph channel
is adjusted so the MOC operator pin on the circuit breaker is
centered in the channel.

5.4 MANUAL OPERATION CHECK

Manual operational checks must be performed before the circuit
breaker is connected to an energized circuit. Tests must be
performed with the circuit breaker withdrawn from the circuit
breaker compartment or in the 'Disconnect' position. While the
circuit breaker is withdrawn or in the 'Disconnect' position, place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 toggle with an audible "click" and the Springs Charged
/ Discharged Indicator shows 'Charged'. Remove the maintenance
tool.
m NOTICE
IF THE SPRINGS ARE TO BE CHARGED ON A CLOSED CIRCUIT 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. CONTINUE ATTEMPTS TO FURTHER
CHARGE MAY RESULT IN DAMAGE TO THE MECHANISM.
28 Instruction Book
CHANNEL SHOWN
IN OPEN POSITION
MOUNTING HARDWARE
MOUNTING HARDWARE
IB182917EN September 2018 www.eaton.com
m WARNING
ALWAYS REMOVE THE MAINTENANCE TOOL AFTER CHARGING THE
SPRING. FAILURE TO REMOVE THE MAINTENANCE TOOL FROM THE
CIRCUIT BREAKER COULD CAUSE INJURY TO PERSONNEL AND/OR
EQUIPMENT DAMAGE IF THE CIRCUIT BREAKER WERE TO CLOSE.
Close and trip the circuit breaker by pushing the Push To Close
Operator then the Push To Open Operator (Figure Set 3.3).

5.5 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.

5.6 INSULATION

Check circuit breaker primary and secondary insulation per Section 6.

5.7 CONTACT EROSION AND WIPE

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

5.8 PRIMARY CIRCUIT RESISTANCE

Check the primary circuit resistance as described in Section 6. The
resistance should not exceed the values specified. Record the values
obtained for future reference.

5.9 SNUBBER ADJUSTMENT

m DANGER
FOR ALL CIRCUIT BREAKER COMPARTMENTS, 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 DEATH, SEVERE PERSONAL
INJURY, EQUIPMENT DAMAGE AND/OR IMPROPER OPERATION.
Before racking a circuit breaker into any and all circuit breaker
compartments, the snubber bolts must be adjusted as outlined in
steps 1 and 2. Refer to Figure Set 3.3 and Figure 5.4 for reference
purposes. If a circuit breaker is moved from one circuit breaker
compartment to another, the procedure must be repeated for the
new circuit breaker compartment.
Sttp 1: Measure the distance from the floor plate of the circuit
Figurt 5.4. Snubbtr Bolt Adjustmtnt
0.00" to 0.031"
N otte:
Reference Section 3 for the
specific location of the Snubber Bolt
for each DHP-VR + Rating.
breaker compartment to the underside of the current transformer
shelf on both sides of the circuit breaker compartment in line
with the location of the snubber bolts on each side of the circuit
breaker (Figure 5.4).
Sttp 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 transformer shelf and tighten the locking
nut.

5.10 ELECTRICAL OPERATIONS CHECK

After going through the above steps, the circuit breaker is now ready
to be operated electrically. It is preferred that this check be made
with the circuit breaker in the 'Test' position in the circuit 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