5
Hazardous procedures
In addition to other procedures described in
this instruction manual as dangerous, user
personnel must adhere to the following:
1. Always work only on a de-energized
circuit breaker. The circuit breaker should
be isolated, grounded and have all control
power removed before performing any
tests, maintenance or repair.
2. Before working on the circuit breaker
make sure the capacitors (106.2) are fully
discharged (refer to Figure 2: Operator
controls and discharging capacitors on
page 7). Verify that the CLOSE/OPEN
indicator (58.0) is in the OPEN position.
Discharge the capacitors (106.2) by
unplugging the connector (105.2) on the
controller board (105.0). The red LED
(106.4) on each of the capacitor boards
(106.1) indicate the state of the charge
on the capacitors (106.2). When the
capacitors (106.2) are in fast-discharge
mode (by unplugging connector (105.2)),
the LEDs are flashing. This indicates
hazardous voltage. When the LEDs stop
flashing, the capacitors are discharged to
a low voltage.
3. Always let an interlock device or safety
mechanism perform its function without
forcing or defeating the device.
Field service operation and warranty
issues
Siemens can provide competent, well-trained
field service representatives to provide
technical guidance and advisory assistance
for the installation, overhaul, repair and
maintenance of Siemens equipment,
processes and systems. Contact regional
service centers, sales offices or the factory for
details, or telephone Siemens field service at
+1 (800) 347-6659 or +1 (919) 365-2200
outside the U.S.
For medium voltage customer service issues,
contact Siemens at +1 (800) 347-6659 or +1
(919) 365-2200 outside the U.S.
NOTICE
Capacitor discharge plug (105.2)
Disconnect control power prior to removing or
replacing the capacitor discharge plug. Refer to
Figure 2 on page 7.
To discharge capacitors:
Disconnect control power to the circuit breaker
by opening the disconnect device (device 08 in
the typical schematic in Figure 14 on page 24)
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 14 on page 24)
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 14 on page 24).
