Siemens 3AH3 Instruction Manual page 10

10
Spring-discharge check (refer to Figure 1)
Perform the spring-discharge check before
removing the circuit breaker or operator
module from the pallet or removing it from
the switchgear.
The spring-discharge check should be
performed after de-energizing control
power. This check assures both the tripping
and closing springs are fully discharged.
Note: Do not perform the spring-discharge
check if the circuit breaker is in the
CONNECT position. Open the circuit breaker
and rack to the DISCONNECT position, and
then perform the spring-discharge check.
For fixed-mounted circuit breaker
applications, open the isolator switches on
the line side and on the load side of the
circuit breaker before performing the spring-
discharge check.
1. Press red trip pushbutton.
2. Press black close pushbutton.
3. Press red trip pushbutton again.
4. Verify spring-condition indicator shows
DISCHARGED.
5. Verify main contact status indicator
shows OPEN.
Manual-spring charging check
1. Insert the manual-spring charging crank
into the manual-charge handle socket as
shown in Figure 1. Turn the crank
clockwise (about 48 revolutions) until
the spring condition indicator shows the
closing spring is CHARGED.
2. Repeat the spring-discharge check.
3. Verify the springs are DISCHARGED and
the circuit-breaker primary contacts are
OPEN by indicator positions.
As-found and vacuum-integrity check
tests
Perform and record the results of both the
as-found insulation test and the vacuum-
integrity check (dielectric) test. Procedures
for these tests are described in the
Maintenance section of this instruction
manual beginning on page 28.
Automatic spring-charging check
The automatic spring-charging features of
the circuit breaker must be checked. Control
power is required for automatic spring-
charging to take place.
Note: A temporary source of control power
and test leads may be required if the
control-power source has not been
connected to the switchgear or circuit
breaker. Refer to specific wiring information
and rating label for your circuit breaker to
determine the voltage required and where
the control-voltage signal should be applied.
When control power is connected to the
circuit breaker, the closing spring should
automatically charge.
1. Open control-power circuit by opening
the control-power disconnect device.
2. Energize (close) the control power-circuit
disconnect.
3. Use the close and open controls (refer to
Figure 1) to first close and then open the
circuit breaker contacts. Verify contact
positions visually by observing the OPEN/
CLOSED indicator on the circuit breaker.
4. De-energize (close) the control-power by
repeating Step 1. If a split-plug jumper
was used for temporary control-power
connections, disconnect the split-plug
jumper from the switchgear first and
next from the circuit breaker.
5. Perform the spring discharge check
again. Verify the closing springs are
DISCHARGED and the primary contacts of
the circuit breaker are OPEN.
Final mechanical inspections without
control power
1. Make a final mechanical inspection of
the circuit breaker. Verify the contacts
are in the OPEN position, and the closing
springs are DISCHARGED.
2. Verify mechanical condition of springs.
3. Check for loose hardware.