Instruction Book
Effective: March 2007
Page 39
IB6513C80G
For more information visit:
www.EatonElectrical.com
6-9.1 CLOSURE
™
TEST
Introduction:
The CloSure
TM
Test is a simple yet
extremely effective means to determine and monitor the
ability of the mechanism to close the breaker contacts
fully. It provides a quantitative measure of the extra
energy available in terms of over travel in inches to
close the breaker contacts to their full extent. It may be
used periodically to monitor the
health
of the
mechanism.
General Information:
The CloSure
TM
Test can be per-
formed on the VCP-W, VCP-WR, VCPW-ND, DHP-VR,
W-VACR, and W-VAC lines of vacuum circuit breakers.
Refer to Table
6.4
for a list of circuit breakers. If the
CloSure
TM
travel obtained is as specified, the
mechanism performance is satisfactory. If the
CloSure
TM
travel does not conform as shown in Figure
6-19,
contact Cutler-Hammer for further information.
(See Step
13).
WARNING
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.
Safety Precautions:
Read and understand these
instructions before attempting any maintenance, repair or
testing on the breaker. The user is cautioned to observe
all recommendations, warnings and cautions relating to
the safety of personnel and equipment.
The recommendations and information contained herein
are based on Cutler-Hammer 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
Cutler-Hammer.
Testing Procedures:
Assuming that the breaker is safely
pulled out to the Test/Disconnect position in the enclosure
or placed on the workbench, follow this procedure to
perform the CloSure
TM
Test using Kit Style#
6352C58G01. For further instructions on disconnecting
the circuit breaker consult Section 4 of this manual. If the
enclosure is equipped with the MOC operating in the
Figure 6-6 Status Indicators
(
“
A
”
shows the contact status
indication and
“B”
shows the spring indication.)
test position also, make certain that the MOC is
connected to operate.
Step 1 -
On the front cover identify the status indicators.
MAKE SURE THE CLOSING SPRING STATUS
INDICATES
“
Discharged
”
AND THE MAIN CONTACT
INDICATOR SHOWS
“
Open”
(Figure
6-6).
Step 2 -
Remove the circuit breaker front cover.
Be sure
Figure 6-7 Starting Tape at Bottom of Cam
