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