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7. Commissioning
Danger
High voltage!
Touching live parts will result in death or severe
personal injury.
This equipment may be operated only by qualified
personnel who have become thoroughly familiar with
the operating instruction manual and in particular all
safety instructions.
CAUTION
This equipment contains hazardous voltages and
mechanical parts which move at high speed and may
be controlled remotely.
Non-observance of the safety instructions can result in
severe personal injury or damage to the property.
In particular:
Do not open the door of the mechanism housing. Do
not reach inside the operating mechanism. Do not
touch pole assemblies and operating rods mounted in
the base frame.
Prior to commissioning, check the vacuum circuit-breaker
in accordance with the following points.
1.
Clean the circuit-breaker as applicable (for
details refer to "Cleaning").
2.
Check that all fixing and terminal screws are
tightened securely.
3.
Examine the circuit-breaker for any external
damage, especially to the terminal pads,
porcelain insulators and vent tube.
4.
Check functioning of space heater.
7.1
Slow Closing Operation (Optional)
When CB is in open position, with the closing and
tripping springs discharged and auxiliary supply switch in
OFF position, start the following sequence.
(a)
Insert the manual handle (P-7, Fig. 7) between
the drive mechanism shaft (P-17, Fig. 11) and
pin (P-18, Fig. 11).
(b)
Slowly move the handle down till the trip pawl
latches with the trip lever roller. The CB contacts
have closed. This will be shown by the
movement of ON/OFF indicator to "I" symbol.
12
7.2
Slow Opening Operation (Optional)
Starting with the condition at the end of the slow closing
operation
(a)
Insert the manual handle in the same position.
(b)
Move the handle down still further.
(c)
Keeping the handle pressed down, press the OFF
P.B. (P-6, Fig. 11) and gradually release the
pressure on the handle, allowing the shaft to
rotate. The movement ends with the indicator
showing "O" symbol for CB Off.
Safety Precautions : Always keep downward pressure
on the handle. Release pressure gradually. Withdraw
the handle for further steps.
7.3
Charging the Closing Spring manually
(Fig. 11)
CAUTION
The vacuum circuit-breaker may be operated manually
with the hand crank in order to avoid injuries that may
occur if the motor starts up suddenly.
Insert the hand-crank in hole (P-15) and turn it clockwise
until the indicator (P-8) shows "closing spring charged".
The hand-crank is coupled with the charging mechanism
via a decoupling facility. The operator is thus not exposed
to any risk should the control supply recover during
charging.
7.4
Manual Closing (Fig. 11)
Press the "ON" button (P-3) or initiate a switching
command from the control room until the vacuum
breaker has closed. The ON-OFF indicator (P-9) will then
display the symbol "I" and the closing spring indicator
will display "spring discharged" symbol.
The closing spring is automatically recharged by the
motor mechanism immediately after the breaker has
closed. In hand operated breakers, the closing spring can
be recharged by hand.
7.5
Manual Opening (Fig. 11)
The tripping spring is charged during closing. To open
the breaker, press the "OFF" button (P-6) or initiate a
tripping command from the control room unit. The
vacuum breaker will open and the "O" symbol is
displayed by indicator (P-9).
Note: Closing and opening operations of CB can be
checked locally also by CB ON/OFF switch (P-3 Fig. 10)
mounted on the control panel inside the mechanism
housing.
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