The circuit-breaker closes correctly.Putting into service
6.
Supply the shunt opening release the
corresponding rated voltage.
Supply the shunt closing release its rated
voltage.
Model L3447
A pparatus Emax DC
S cale
D oc-N 1SDH000635R0002
Page No. Attempt circuit-breaker
closing operation. Supply the undervoltage release the
corresponding rated voltage (if any).
Open the circuit-breaker, turn the key and
remove from its seat.
Carry out some racking-in and out operations.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Note.
Racking-in operation: the circuit-breaker racks
in correctly.
Item inspected
1 Manual operating mechanism
2 Geared motor (if any)
3 Undervoltage release
(if any)
4 Shunt opening release (if any)
5 Shunt closing release (if any)
6 Circuit-breaker lock the open position
(with key padlocks)
7 Auxiliary contacts the circuit-breaker
8 Auxiliary contacts for signalling circuit-
breaker connected, test isolated and
disconnected
9 vice irc it-b rs
connected and disconnected. The signal changes
over. The first turns the crank handle
do not meet with particular resistance.
The circuit-breaker opens correctly. Then put the circuit-breaker the
connected, test isolated and disconnected
position.
Open the circuit-breaker.
Insert the auxiliary contacts suitable signalling
circuits. The signals
are correct. Carry out some circuit-breaker closing
and opening operations.
Disconnect voltage the release.
The signals are correct.
Positive check
The spring loading lever moves correctly.
The circuit-breaker opens. The
signals are correct.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Carry out the operating tests.
C arry som sin and g
operations.
The geared motor reloads the springs after
each closing operation.
Both anual and electrical closing are
prevented.
Insert the auxiliary contacts suitable signalling
circuits.1 eneral res
- Check tightness the power connections the circuit-breaker terminals
- Carry out all the preparatory operations the release
- Make sure that the value the auxiliary circuit power supply voltage between and 110% the rated voltage the electrical applications
- Make sure that there adequate air circulation the place installation avoid overheating
- Also carry out the checks specified the following table.
Supply the spring loading geared motor the
corresponding rated voltage.
The locks function correctly.
14/1 08
.
The signals due the relative operations are
given correctly.2).
The signals are given correctly.
CAUTION
When there undervoltage release, the
circuit-breaker can only closed after the
release has been electrically energized. Interlocking
devices between circuit-breakers side by
side and one top another (if any)
10 For withdrawable circuit-breakers: racking
-in/out device
Procedure
Carry out some opening and closing operations
(see the chapter 7.
Close the circuit-breaker.
The circuit-breaker closes correctly. The signals
are correct.
The geared motor stops with the springs
loaded.
The springs are loaded correctly
