Supply the shunt closing release its rated
voltage.
Model L3447
A pparatus Emax DC
S cale
D oc-N 1SDH000635R0002
Page No.
14/1 08
.
Supply the spring loading geared motor the
corresponding rated voltage. The
signals are correct. Supply the undervoltage release the
corresponding rated voltage (if any).
The circuit-breaker closes correctly.
The signals due the relative operations are
given correctly. Attempt circuit-breaker
closing operation. The first turns the crank handle
do not meet with particular resistance.
Open the circuit-breaker, turn the key and
remove from its seat.Putting into service
6. 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.
C arry som sin and g
operations.
The geared motor reloads the springs after
each closing operation.
The locks function correctly. The signals
are correct.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. Then put the circuit-breaker the
connected, test isolated and disconnected
position.
Racking-in operation: the circuit-breaker racks
in correctly.
Positive check
The spring loading lever moves correctly.
Carry out the operating tests.
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.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Supply the shunt opening release the
corresponding rated voltage.
The circuit-breaker opens correctly.
The circuit-breaker closes correctly.
Close the circuit-breaker.
Insert the auxiliary contacts suitable signalling
circuits.
The signals are correct. The signal changes
over.2).
The circuit-breaker opens.
The signals are given correctly.
Carry out some racking-in and out operations. Carry out some circuit-breaker closing
and opening operations.
Note.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Both anual and electrical closing are
prevented.
Open the circuit-breaker.
The springs are loaded correctly. The signals
are correct.
The geared motor stops with the springs
loaded.
Insert the auxiliary contacts suitable signalling
circuits.
CAUTION
When there undervoltage release, the
circuit-breaker can only closed after the
release has been electrically energized.
Disconnect voltage the release
