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C O M M I S S I O N I N G / O P E R A T I O N
Key to the charging condition displays:
Discharged
2. If the control voltage fails with the circuit
breaker closed, it is possible to open it using
the mechanical OFF push button (1.35).
Emergency operation of the mechanical ON
pushbutton for the circuit breaker operating
mechanism on failure of auxiliary voltage
(figure 6/6b)
Caution: Interlocks are cancelled during
this operation. Only open or close circuits
with the circuit breaker! The three position
switch must be in a limit position !
Release the fastening screws in the circuit breaker
cover and remove the cover. Use a suitable tool
to press the pin in the blocking magnet (2.41) to
the right and simultaneously move the slide
(2.42) to close the circuit breaker.
Note
On failure of the control voltage, there is
no maloper ation protection for the circuit
breaker and three-postion switch during
emergeny manual operation
6.2.2 Three-position switch
(Figures 3/7, 6/1, 6/3 and 6/5)
•
The three position switch (2.1) is fitted with
a motor-operated mechanism. Opening and
closing are effected by selection on the
multifunction protection and switchbay
control unit or by means of the devices fitted
•
Routine opening/closing operations
may only be performed with the control
cabinet door closed. Opening of the
control cabinet door can constitute
intervention in the interlock system (see
sections 3.8 to 3.10)
•
Observe the switch position indication on the
electrical position indicators
•
Sensors 2.28 to 2.31 or microswitches 2.37 to
2.40 on the three position switch operating
mechanism detect the switch positions
- Disconnector (-Q1) ON and OFF
- Earthing switch (-Q5) ON and OFF
Emergency manual operation
In place of motorised operation, the switching
process can also be initiated and completed
manually.
Caution!
Intervention in the interlock concept is
possible by opening the control cabinet door.
•
Switch the three-position switch on or off
manually
This requires the following actions:
- Open the control cabinet door
Charged
- Switch the circuit breaker off
- With the " mechanical interlock between
circuit breaker and three position switch "
option, opening flap (2.22) on the three
position switch operating mechanism
activates a mechanical interlock between
the two devices
Note
The flap (2.22) can only be opened when the
circuit breaker is OFF.
•
Prior to emergency manual operation, switch
off the mcbs for the circuit breaker release
circuit and for the operating mech anism of
the position switch
•
Insert the crank (6.1) in the hollow shaft (2.26)
•
A cam fitted at the crank prevent in cooperation
with a bolt which is routed at the operation
mechanism to run over the middle position
•
Three-position switch operation
If the three-position switch is in the central
position (i.e. disconnector and earthing switch
OFF), the disconnector can be closed with
approx. 24 clockwise turns, and the earthing
switch with approx. 24 anti-clockwise turns.
If the " earthing switch ON " position is to be
reached from the " disconnector ON " position,
or vice versa, the crank is to be removed in the
self-inhibiting central position (disconnector
and earthing switch OFF) and refitted. When
the crank is refitted, the further switching
operation is automatically enabled.
Note
Always perform every switching operation right
up to the stop in the relevant limit position.
•
Close flap (2.22) again
If the hand crank is withdrawn in an intermediate
position, the flap cannot be closed.
This intermediate position can be seen on the
one hand by the lack of a mechanical limit
position indication for the three position switch
and also by the electrical displays on the front
door.
The limit positions are only correctly indicated
when the switch is in a limit position, i.e. when
the contacts have full current carrying capacity.
The flap (2.22) can then be closed and the circuit
breaker switched on.
When the circuit breaker is open, the flap can
also be opened in an intermediate position
35
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