Eaton SVS/12, User Manual

Page: 86 / 138

SVS/12
86 994.530 G01 02
4.2.3 Switching on and off, 1250 A panels
Mechanical switching on
1. Check by the position indicator (4) that the disconnector
is fully in the busbar position or fully in the earthing
position.
2. Slide the selector (7) to the left.
3. Check that the spring is tensioned.
4. If the spring is not tensioned:
4.1 Place the operating handle on the operating shaft (2) of
the circuit-breaker.
4.2 Turn the operating handle clockwise (360º) until the
spring is tensioned.
The position indicator (1) should indicate the on
position.
5. If the spring is tensioned:
switch the panel on by pressing the switch-on button.
The position indicator (1) should indicate the on
position.
6. Remove the operating handle.
Electrical (remote) switching on
In the case of remote-controlled installations, the selector
(7) should be left in the central position.
1. With auxiliary voltage connected, the spring-tensioning
motor tensions the closing spring.
2. Check the position of the disconnector. It must be fully
in the busbar position or fully in the earthing position.
3. Check that the selector (7) is in the central position.
4. Press the (remote) switch-on button:

The position indicator (1) should indicate the on
position.
The switch-on button can optionally be equipped with a
key interlock to prevent unwanted switching on.
Mechanical switching off
1. Firmly press the switch-off button (5).
The position indicator (1) should now indicate the off
position.
Electrical (remote) switching off
1. Press the (remote) switch-off button:
The position indicator (1) should now indicate the off
position.
No-voltage coil
The installation can optionally be equipped with a no-
voltage coil.
The no-voltage coil satisfies the requirements of
IEC 62271-1.
The no-voltage coil works in the following way:

If the secondary voltage drops below 35% of the rated
value (Un), the no-voltage coil trips and turns off the
switch. With the no-voltage coil tripped, the switch can
no longer be turned on mechanically or electrically.

If the secondary voltage becomes higher than 85% of
the rated value (Un), the no-voltage coil engages and
the switch can be turned on again.

The operation of the no-voltage coil can be tested by
varying the secondary voltage and checking whether
the coil trips and reengages at the thresholds
mentioned above.
N
OTE
The switch must be turned off when this is done.
Tripping coil
The tripping coil turns the switch off electrically. The
tripping coil is operated by means of a local or remote
switch-off button.
N
OTE
The switch-off button (6) on the switch is always
mechanical.
In addition to the tripping coil, it is possible to fit a second
tripping coil or a no-voltage coil.