Eaton DHP VR + Series Instruction Book page 37

6.8.2 CLOSURE™ TEST (75/150DHP-VR + Modtls)
Introductione: The CloSure™ Test is a simple yet extremely effective
means to determine and monitor the ability of the mechanism to
close the circuit breaker contacts fully. It provides a quantitative
measure of the extra energy available in terms of over travel in
inches to close the circuit breaker contacts to their full extent. It may
be used periodically to monitor the health of the mechanism.
Gtntral Informatione: The CloSure™ Test can be performed on all
VR-Series + circuit breakers. (Refer to Table 6.3.) If the CloSure™
travel obtained is as specified, the mechanism performance is
satisfactory. If the CloSure™ travel does not conform as shown in
Figure 6.26, contact Eaton's Electrical Services & Systems for further
information. (See Step 13).
m DANGER
DO NOT ATTEMPT TO INSTALL OR PERFORM MAINTENANCE OR TESTS ON
THE EQUIPMENT WHILE IT IS ENERGIZED. NEVER PUT YOUR HANDS NEAR
THE MECHANISM WHEN THE CIRCUIT BREAKER IS IN THE CHARGED OR
CLOSED POSITION. DEATH OR SEVERE PERSONAL INJURY CAN RESULT
FROM CONTACT WITH ENERGIZED EQUIPMENT. ALWAYS VERIFY THAT
NO VOLTAGE IS PRESENT BEFORE PROCEEDING WITH THE TASK, AND
ALWAYS FOLLOW GENERALLY ACCEPTED SAFETY PROCEDURES.
Saftty Prtcautionse: Read and understand these instructions before
attempting any maintenance, repair or testing on the circuit breaker.
The user is cautioned to observe all recommendations, warnings and
cautions relating to the safety of personnel and equipment.
N otte:
Hearing protection is recommended as the circuit breaker is opened
and closed.
The recommendations and information contained herein are based
on Eaton experience and judgment, but should not be considered to
be all-inclusive or covering every application or circumstance which
may arise. If further information is required, you should consult
Eaton's Electrical Services & Systems.
Ttsting Proctdurtse: Assuming that the circuit breaker is safely
removed from the circuit breaker compartment enclosure and
positioned in an area outside the arc fault boundary, follow this
procedure to perform the CloSure™ test. For further instructions on
removal of the circuit breaker from the circuit breaker compartment,
refer to the appropriate section of this manual.
Figurt 6.15. Status Indicators ("A" shows tht spring indication
and "B" shows tht contact status indication.)
CLOSING
SPRING
Manual
Charge
Socket
+
VR-Series
Vacuum
Circuit Breaker
Push Push
To To
Close Open
Made in the U.S.A.
Main
Contact
A
Open
Status
Closing
Spring B
Discharged
Status
Breaker
Operations
Counter
94C9523H71
VR-Series
Sttp 1 - On the front cover, identify the status indicators. Confirm
the closing spring status indicates 'Discharged' and the main
contact indicator shows 'Open' (Figure 6.15).
Sttp 2 - Remove the circuit breaker front cover. Be sure to save the
original fasteners for reassembly.
Sttp 3 - Charge the circuit breaker, close the circuit breaker, then
open the circuit breaker. Alternately depress the Open and Close
clappers a few times to ensure the circuit breaker is completely
discharged.
Sttp 4 - Cut a piece of one inch wide drafting / masking tape
approximately 8 to 10 inches long.
Sttp 5 - Clean the far left cam with a mild solvent such as alcohol.
Place the tape around the cam starting from the bottom up. Make
certain that the tape adheres well to the cam surface. (Figure
6.16).
Figurt 6.16. Wrapping Tapt Around Cam
Sttp 6 - Mount the transparent CloSure™ Test Tool (Figure 6.17 .b)
with two bolts and washers. Refer to Figure 6.17 .a and Table 6.3
for approximate mounting holes. Hand tighten the bolts.
Sttp 7 - Using a red Sanford
(or equivalent), place the marker tip in the proper hole ("C")
located over the cam and make a heavy mark on the tape by
moving the marker as described in Figures 6.19 and 6.23. Remove
the marker from the hole.
Sttp 8 - Charge the closing springs with the maintenance tool
(Charging handle). Continue charging the closing springs until a
"click" is heard and the status indicator shows 'Charged' (Figure
6.18).
Figurt 6.17.a. Attaching CloSurt™ Ttst Tool
Instruction Book
IB182917EN September 2018 www.eaton.com
DHP-VR
+
Replacement Circuit Breaker
Sharpie fine point permanent marker
® ®
+
37