Siemens 3TM Manuel d'utilisation - Page 38
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Maintenance
Fig. 38
OPEN switch position
Adjusting the switching
stroke of vacuum
interrupters
38
Limit
Limit: a - b = min. ≥ 3.5 mm or max. ≤ 7.5 mm
a
OPEN switch position
b
CLOSED switch position
Torsional loading of the draw bar (40) of the vacuum interrupters (3) must be pre-
vented.
Fig. 40
OPEN switch position - cross-sectional view
7
Pole shell
40
Draw bar for vacuum interrupter
41
Locking nut
42
Adjusting nut
43
Spherical seat
If the permissible limit for the difference between "a" and "b" is reached, the inter-
rupters can be readjusted as follows:
•
Remove the vacuum contactor from the switchgear if necessary
•
Measure the distance between the top edge of the pole shell (7) and the top
edge of the draw bar (40), see Fig. 38 and Fig. 39 in the OPEN and CLOSED
conditions. This is done by switching the vacuum contactor CLOSED and OPEN
again.
•
Use a size 12 open-end spanner to keep the adjusting nut (42) from turning.
•
Use an additional size 13 open-end spanner to loosen the locking nut (41) over
the adjusting nut (42) and the spherical seat (43).
•
To readjust the switching stroke:
-
If the value is below the limit - turn the adjusting nut (42) clockwise at least
one turn, approx. 1.5 mm lower. A complete turn corresponds to approx.
Fig. 39
CLOSED switch position
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2019-01-09