5. OPERATION 77
the spring mechanism is indicated mechanically
(Fig. 5.5.1.1).
• On failure of auxiliary voltage or the stored
energy spring charging motor for the circuit-
breaker, the charging process can be carried out
or completed manually.
• To do this, insert the charging lever (
8
in
fig. 5.5.1.2) into the receptacle and perform
approximately 25 strokes until the charged
condition is indicated.
• When the charged condition is reached, the
charging mechanism is disengaged, and no
further movements of the charging lever can be
made.
Circuit-breaker operating mechanism fitted
The blocking magnet -RLE1 blocks the mechanical
ON button of the circuit-breaker in certain
situations. This interlock is active on failure of the
supply voltage. Deblocking of the blocking
magnet requires work inside the circuit-breaker
operating mechanism, and may only be
performed by qualified personnel. Please contact
the ABB Service Department if required.
On failure of auxiliary voltage, the charging motor
of a circuit-breaker or the operating mechanism
motor of a three position disconnect or
disconnect, emergency manual operation is as a
rule possible.
In the case of double busbar panels, no
uninterrupted change of busbar is possible in
emergency manual operation when a mechanical
interlock is used, as the interlock prevents
simultaneous closing of both disconnects in an
outgoing feeder panel.
Emergency manual operation is performed with
the low voltage compartment door open.
Hazard warning
Opening of the low voltage compartment
door permits intervention in the
interlock system
maloperation is then ineffective.
Prior to emergency manual operation,
switch the mcbs (
1
mechanism of the three position
disconnect and the circuit-breaker
operating mechanism (release circuit and
circuit-breaker
Controls for the circuit-breaker operating
mechanism
The front of the operating mechanism (fig. 5.5.1.1)
accommodates the mechanical on
1
and off
2
pushbuttons, the receptacle for manual charging
of the stored-energy spring
3
, the mechanical
indicators for “Circuit-breaker ON” “Circuit-
breaker OFF”
4
, “Stored-energy spring charged”,
“Stored-energy spring discharged”
5
, an
operating cycle counter
6
and the name plate
for the circuit-breaker
7
.
Operation
• Before operating the circuit-breaker, observe
the switch position indicator
4
in fig. 5.5.1.1.
• On failure of auxiliary voltage, it is possible to
open the circuit-breaker using the mechanical
OFF button at any time .
• Closing the circuit-breaker with the mechanical
ON pushbutton requires the presence of the
auxiliary voltage (without auxiliary voltage the
blocking magnet -RLE1 blocks the ON button)
and a charged spring mechanism. The state of
1. mcb: miniature circuit breaker.
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