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Operating Mechanism Maintenance
Item
1
Operating rod
2
Interlocking arm
3
Blocking pin
4
Hole for blocking pin
1HSB515409-100 en rev2
7.
The interlocking mechanism is disengaged.
a.
Press the operating rod (1) or the interlocking arm (2) upwards.
b.
Insert the blocking pin (3) in the hole (4).
Figure 4-6. Interlocking, circuit-breaker open and closing springs uncharged.
8.
The blocking beams move against the mechanical end stop.
a.
Crank anticlockwise, normally 6-8 turns, max. 10 turns.
9.
The intermediate catch is released.
a.
Press down the armature on the closing coil (1).
The slow closing operation in progress can be interrupted in any position before the
locking lug engages the roller. Press in the reverse catch button, so that the circuit-
breaker runs slowly towards its open position and stops in the required position
when the button is released.
1.
Crank anticlockwise 310 turns. The cam disc (2) then rotates approx. 3/4 of a
turn and actuates the stop roller (3) so that the operating lever (4) slowly moves
the circuit-breaker towards the closed position. Towards the end of the
movement a click is heard when the locking lug (5) on the operating arm
engages behind the roller (6) in the tripping mechanism.
2.
Crank a few more turns anticlockwise, so that the outer most tip on the cam
disc (2) leaves the stop roller (3). The operating lever is drawn quickly towards
the open position by the power of the opening spring until the locking lug (5)
loudly rests against the roller (6).
3.
Crank anticlockwise until the locking lug (7) just rests against the roller (8) so
that the cam disc returns to its normal position and the blocking beams are off-
loaded.
4.
Remove the blocking beams.
5.
Check that the locking lug (7) rests against the roller (8). Otherwise the cam
disc will come in the wrong position and the operating mechanism can be
damaged during an opening operation.
4
3
B20005
2
1
Open
position
Closed
position
25
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