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6
IB 6.2.7.7-3
1. Immediately upon the availability of control
power at terminals "05" and "02", the spring
charging motor is energized, which in turn
charges the closing springs.
closing springs are charged, limit switch
contact "LSa" is closed. Also, upon availability
of control power at disconnects "01" and "6"
through auxiliary switch "b" contact, and after
the closing springs have been charged, the
lockout relay coil (Y) will be energized through
the circuit breaker auxiliary switch "b" contact
and the parallel resistors R1 and R2.
lockout relay will pick up and close contact
"Ya".
2. Connecting wires "03" or "7" to control power
via operation of the close control switch
energizes the latch release coil (X) through
the circuit breaker auxiliary switch "b" contact,
the normally open lockout relay contact "Ya",
and the limit switch contact "LSa". The latch
release coil (X) releases the closing latch.
The springs then discharge to close the circuit
breaker.
3. When the springs discharge, limit switch
contact "LSb" closes and limit switch contact
"LSa" opens.
4. When limit switch contact "LSb" in the motor
circuit closes, the spring charging motor is
energized, which in turn recharges the closing
springs.
5. When the circuit breaker closes, all auxiliary
switch "b" contacts open and all auxiliary
switch "a" contacts close.
6. When the limit switch contact "LSb" closes,
the lockout relay coil (Y) is de-energized and
opens lockout relay contact "Ya", which de-
energizes the latch release coil (X). Lockout
coil (Y) is locked out as long as the Close
signal is maintained.
maintained control power on disconnects "03"
or "7" puts resistor R1 in parallel with lockout
coil (Y). The additional current flow through
parallel resistors R2 & R3 and the associated
increased voltage drop leaves insufficient
voltage to pick up the lockout relay.
purpose of the lockout relay is to prevent
pumping of the circuit breaker's mechanism
when closing against a faulted circuit.
When the
The
This is because the
The
7. After the breaker has closed and when the
closing control switch is released by the
operator, the lockout relay coil (Y) remains de-
energized due to the auxiliary switch "b"
contact in the closing circuit being open.
8. The Circuit Breaker can be tripped by
operation of the Remote Trip Switch which is
connected to Disconnects "04" and "10". This
energizes the breaker Trip Coil (TC) through
the auxiliary switch "a" contact.
9. The
Undervoltage
provides a direct acting lock-open and
Undervoltage tripping feature.
must be energized to initially close the
breaker, and to maintain the breaker in a
closed position.
10. The Latch Check Switch (LCS), if furnished,
insures that the operating mechanism must be
reset prior to energizing the closing latch
release coil (X).
11. The remote mounted capacitor trip feature
(recommended for AC trip), if furnished,
provides an electrical energy storage network.
Should a loss of control power occur at the
instant of a tripping signal, sufficient energy
will be furnished to insure an electrical tripping
operation.
12. The stopping device switch, if applicable,
prevents electrical reclosing of the Circuit
Breaker after a manual trip until the stopping
device switch has been manually reset.
Device,
if
furnished,
This device
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