Attempt circuit-breaker
closing operation.
Open the circuit-breaker, turn the key and
remove from its seat.
Racking-in operation: the circuit-breaker racks
in correctly. The signal changes
over.
Note. Carry out some circuit-breaker closing
and opening operations.
The circuit-breaker opens.
Model 2234 Apparatus Scale
L 2778
Doc-Na 1SDH000460R0002
Page No.
Both anual and electrical closing are
prevented. The signals
are correct.
P itiv ck
The spring loading lever moves correctly. The first turns the crank handle
do not meet with particular resistance.
Supply the shunt opening release the
corresponding rated voltage.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation. The signals
are correct.
Carry out the operating tests.
ite d
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 Lock vice circ it-b rs
connected and disconnected.
CAUTION
When there undervoltage release, the
circuit-breaker can only closed after the
release has been electrically energized.
The circuit-breaker opens correctly.
The circuit-breaker closes correctly.
Insertthe auxiliary contacts suitable signalling
circuits.
Insertthe auxiliary contacts suitable signalling
circuits.Putting into service
6.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Carry out some racking-in and out operations. Supply the undervoltage release the
corresponding rated voltage (if any).
The geared otor stops with the springs
loaded.
The signals due the relative operations are
given correctly.
The signals are given correctly.
15/158
.
Supply the spring loading geared motor the
corresponding rated voltage.
Disconnect voltage the release.
Close the circuit-breaker.
The geared motor reloads the springs after
each closing operation.
The signals are correct.1 eneral s
- 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.
Open the circuit-breaker.
Supply the shunt closing release its rated
voltage.
C arry som sin and ning
operations. Then put the circuit-breaker the
connected, test isolated and disconnected
position.2). The
signals are correct. Interlocking
devices between circuit-breakers side by
side and one top another (if any)
10 For withdrawable circuit-breakers: racking
-in/out device
P re
Carry out some opening and closing operations
(see the chapter 7.
The springs are loaded correctly.
The circuit-breaker closes correctly.
The locks function correctly
