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