26
Opening the knife switch de-
energizes control power to the
circuit breaker. In some circuit
breakers, pullout type fuse
holders or molded-case circuit
breakers are used in lieu of
knife switches. Removal of the
fuse holder or opening the
molded-case circuit breaker
accomplishes the same result:
control power is disconnected.
If any maintenance is to be
performed, discharge the
capacitors.
Figure 7: Operator controls and discharging capacitors
NOTICE
Capacitor discharge plug (105.2)
Disconnect control power prior to removing or replacing the capacitor discharge plug. Refer to Figure 7.
To discharge capacitors:
Disconnect control power to the circuit breaker by opening the disconnect device (device 08 in the typical
schematic in Figure 10 on page 51) located in the control compartment.
After control power is off, disconnect the capacitor discharge plug (105.2) from the controller board
(105.0) to discharge capacitors.
To reconnect capacitors:
Disconnect control power to the circuit breaker by opening the disconnect (device 08 in the typical
schematic in Figure 10 on page 51) located in the control compartment.
Insert the capacitor discharge plug (105.2) (with six pins) into the left-hand receptacle on the controller
board (105.0). Ensure that the plug is properly seated and the plug position is level with the power supply
connection plug (105.5) that is located to the right of the capacitor discharge plug.
After the capacitor discharge plug is firmly seated, reconnect control power to the circuit breaker (device
08 in the typical schematic in Figure 10 on page 51).
Item
Description
53.0
Close pushbutton (black)
54.0
Open pushbutton (red)
58.0
CLOSED/OPEN indicator
59.0
Operations counter
60.0
Mechanism housing
60.1
Mechanism housing cover
105.0
Controller board
105.1
Light-emitting diodes (LEDs) (red, yellow, green)
105.2
Connector for capacitors
105.5
Power supply connector
106.1
Capacitor board (two or three depending upon rating)
106.2
Capacitor
106.3
Connector (for each capacitor board)
106.4
Red LED capacitor charge state
54.0
53.0
105.1
60.1
59.0
58.0
60.0
105.0
106.1
106.1
105.2
106.2
106.4
106.3
105.2
105.5
Summary of Contents for SDV7-AR
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