Citadel 2.0 - Instruction Manual - page:
148
IM
-
C
2.0
-
12
/2
5
/3
0/
4
0/
DO
/F
X
| V
: 1
0 / 1
1 / 2
0
21
S E Q U E N T I A L O P E R A T I O N D I A G R A M
FIGURE 131 - OPERATOR SEQUENTIAL OPERATION DIAGRAM
Control
voltage applied.
Spring-charge motor
(M) energized.
S23 opens in series with
S23 closes in series
with close coil
anti-pump relay (52Y).
S21 and S22 oper-
ate to de-energize
spring-charging
motor (88.0).
No action! Open 52b
in series with close
coil (CC) blocks
closing spring-
release.
Close coil actuated
through closed 52b
contacts and two
normally closed
contacts of the anti-
pump relay (Y).
Closing
command
when
circuit
breaker
No action! Anti-
pump relay (Y)
picks up through the
closed S23 contact
and opens.
closing
spring not
charged.
The closing spring is
unlatched.
The opening spring
is charged.
Circuit breaker
auxiliary contacts
52a and 52b change
state.
The circuit breaker
closes.
S21 and S22 close
to energize motor.
52a contacts in
series with the trip
coil (TC) close to
enable a trip
opertion.
Continuous
closing command.
Close coil (CC)
unlatches closing
spring and circuit
breaker closes.
Motor cutoff
switches S21, S22
and S23 are closed
because the closing
spring is discharged.
Before the spring-
charge motor has
recharged the
closing spring
anti-pump relay (Y)
The anti-pump relay
(Y) opens two
contacts in series
with the close coil
(CC).
The close coil
(CC) is now
blocked and cannot
be activated until
springs are fully-
charged and close
command is removed.
Closing
Tripping
Trip coil (TC) can
only be activated
when series
connected 52a
contact is closed.
Circuit breaker trips.
Trip coil (TC)
unlatches the
opening spring.
circuit
breaker
closed.
open.
Closing spring
fully charged.
Trip
command.
As long as there is control power on the breaker - the Citadel closing spring will automatically charge / recharge.
Operating (releasing) the Close Spring closes the circuit breaker which at the same time imparts energy into charging the
Tripping Spring. Therefore, when the circuit breaker is electrically connected to control power and is closed; both its Close and
Trip Springs are charged. This condition allows the circuit breaker to be capable of Opening and then rapidly performing a
Close – Open operation. After three (3) minutes the breaker can again perform a Close – Open operating cycle.
To avoid a continuously applied closing command causing the circuit breaker to reclose automatically after it has
tripped out on a fault as well as damaging the close coil – the Citadel breaker has a relay in the
closing circuit known as an “Anti-Pumping” relay. (ANSI # 52 Y).
picks up and seals in.