Test Operation Of A-Mechanism - ABB NAL Series Installation And Operating Instructions Manual

2
—
39 Shaft extension for the left-hand side operation
4
—
40 Shaft extension.
3
3 2 1
4
When the switches have to be operated from the
left side, an operating shaft must be connected,
see Fig. 36. The mechanism clutch is brought
together with the clutch of the hollow main shaft
and the mechanism is fixed to the frame. Tighten
mounting screws with 15 [Nm] torque.
Insert the shaft extension from the left side of
the apparatus through the hollow shaft into the
mechanism clutch. Secure the shaft extension as
shown in figure below. Tighten the nuts with 9
[Nm] +/-10% torque.
_
Note: Contact knives in open position

12.2 Test operation of A-mechanism

Current knives rotate with great speed and force.
Always keep a safe distance from moving parts of
the switch. Be careful especially with type A
(double spring) mechanism. This kind of drive
stores great energy and can release it by small
rotation of shaft.
After having mounted the mechanism to the
switch frame, check that the latch H is in correct
position by pulling it back to the outermost
position, see Fig.37.
For test operation see item "Test operations".
1. Plain washer M8 DIN126 2 pcs.
2. Shaft secure (1YMX023808P0001) 1 pcs.
3. Wave washer DIN137A 2 psc.
4. Nut M8 DIN934 2 psc.
Check if the shaft extension works properly with
a few operations.
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