32
Instruction Book
IB182017EN February 2017 www.eaton.com
5kV, 7.5kV, & 15kV DHP-VR
Replacement Circuit Breaker
Sttp 4
: Anytime an adjustment is made, use a straightedge to
make sure that the flat surface end of the spring is properly
aligned with the correct step on the gauge for the number of
installed MOC switches. Figure 5.4 shows the alignment being
checked for one installed MOC switch. Always refer back to
the graphic in Figure 5.3 to ensure adjustment of the spring to
the proper step on the gauge for the number of installed MOC
switches.
Sttp 5
: Refer to Figure 5.5 to see the drive spring adjusted for two
installed MOC switches and Figure 5.6 to see the drive spring
adjusted for three installed MOC switches.
Sttp 6
: Any time an adjustment is made, make sure that all nuts
are secured in place and double check for proper adjust with a
straightedge as described in Step 4.
Sttp 7
: When the adjustment is completed, be sure to properly
replace and secure the phase barrier removed in Step 1.
5.3 MECHANISM OPERATED CELL (MOC) SWITCH
PANTOGRAPH ADJUSTMENT
WARNING
FOR ALL TYPE DHP HOUSINGS 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
EQUIPMENT DAMAGE AND/OR IMPROPER OPERATION.
Inspect the MOC pantograph in keeping with the following steps
and refer to Figure 5.7 for additional assistance
Figurt 5.4. Chtcking Drivt Spring for Proptr Adjustmtnt for Ont
Installtd MOC Switch
Figurt 5.5. Drivt Spring Shown Adjusttd for Two MOC Switchts
Figurt 5.6. Drivt Spring Shown Adjusttd for Thrtt MOC
Switchts
Figurt 5.7. MOC Pantograph Adjustmtnt
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 housing 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 breaker is centered in
the channel.
5.4 MANUAL OPERATION CHECK
Manual operational checks must be performed before the breaker
is connected to an energized circuit. Tests must be performed with
the breaker withdrawn from the cell or in the disconnect position.
While the breaker is withdrawn or in the disconnect position, place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 with an audible “click” and the springs Charged / Discharged
Indicator shows “Charged”. Remove the maintenance tool.
