ABB ZS1 Instruction Manual page 47

6.2.4 Tee-off earthing switch
(Figures 3/5, 3/13, 6/13 and 6/14)
Earthing switches of type EK6 are used in ZS1
switchgear. The earthing switch has a snap-action
closing mechanism which is independent of the rotary
motion of the operating shaft. Earthing switches 6
assigned to circuit-breakers are only enabled for
switching when the withdrawable part 13 is in the
test/disconnected position or withdrawn position.
Only switch earthing switches on when the doors
are closed.
Manual opening and closing:
• Press slide 14.2 on the operating lever socket
down (the slide is already in this position when
the switch is closed!).
• Fit the operating lever 122 to the hexagonal shaft
14.1, which is now released for operation.
Note:
Position the operating lever 122 in such a way
pointed upwards or downwards on the hexago-
nal shaft that sufficient room for movement of
the operating lever remains even if space is
constricted at the sides.
• Turn the operating lever 122 clockwise through
approx. 180° until the stop is reached to close
the earthing switch, or anti-clockwise until the
stop is reached to open the earthing switch.
• Observe the mechanical/electrical position
indicator.
• Remove the operating lever 122. Slide 14.2
remains open if the earthing switch is in the
closed position.
Make sure that the operating lever is turned right up
to the stop in the opening process, to ensure that
the earthing switch is in its defined final position.
The manual operating mechanism can also be
fitted with a blocking magnet.
Opening and closing with motor-operated
mechanism:
The earthing switch can additionally be fitted with a
motor-operated mechanism.
• Briefly activate the electrical control for closing
and opening the switch. The earthing switch is
then automatically switched into the opposite
position.
Emergency manual operation:
In case of failure of the motor-operated mecha-
nism, the earthing switch can be switched with the
operating lever by means of emergency manual
operation, in a similar manner to an earthing switch
with a manual mechanism.
Caution!
When activating a motor-operated earthing switch
manually, the interlock is not effective!
48
In emergency manual operation the coupling to the
drive motor is disengaged automatically. To
disengage the motor-operated mechanism, first
move the operating lever further in the previously
selected direction until it meets the stop (slight ang-
le of rotation). When switching with the motor-
operated mechanism after it has been restored, the
coupling automatically engages again.
Note:
The operating lever may only be temporarily fitted
for the performance of an emergency manual
switching operation.
For the duration of the motor failure, the power to
the motor must be switched off.
6.2.5 Busbar earthing switch
(Figures 3/1 and 5/15 to 5/17)
To earth the busbars, earthing switches, also of
type EK6, are used. Their operating mechanism is
identical with that of the tee-off earthing switches
(see section 6.2.4).
The conditions for panel to panel interlocking of the
busbar earthing switches are described in section
3.4.2.
6.2.6 Switch-disconnector
(Figures 6/13 and 6/15)
Only operate switch-disconnectors and earthing
switches when the panel doors are closed.
Notes:
• Fit operating lever 122 to the hexagonal shaft
35.1 pointing either upwards or downwards for
each switching operation in such a way that it is
not obstructed at the sides, even in limited space.
• Ensure that the operating lever 122 is moved
fully into the final position in all switching
operations.
1. Opening and closing of a switch-disconnector
with snap-action ON mechanism and snap-
action OFF mechasnism (type CK3):
• Close the switch-disconnector by turning the
operating lever 122 clockwise through
approx. 180° up to the stop, or open the
switch-disconnector by turning the operating
lever anti-clockwise through approx. 180° up
to the stop.
2. Opening and closing of a switch-disconnector
with snap-action
rechargeable
mechanism (type CR3):
• Close the switch-disconnector by turning the
operating lever 122 clockwise through
approx. 180° up to the stop.
• Recharge
immediately after the closing operation by
turning the operating lever 122 through 180°
in an anti-clockwise direction up to the stop.
ON mechanism
stored-energy spring
the stored-energy
ABB Power Distribution
and
OFF
springs