L6555
Emax
14/74
Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
6.
Putting into service
6.1. General
procedures
- Check tightness of the power connections at the circuit-breaker terminals
- Carry out all the preparatory operations on the release
- Make sure that the value of the auxiliary circuit power supply voltage is between 85 and 110% of the rated voltage of the elec-
trical applications
- Make sure that there is an adequate air circulation in the place of installation to avoid overheating
- Also carry out the checks specifi ed in the following table.
Item inspected
Procedure
Positive check
1 Manual operating mechanism
Carry out some opening and closing
operations (see the chapter 7.2).
CAUTION
When there is an undervoltage
release, the circuit-breaker can only
be closed after the release has been
electrically energized.
The spring loading lever moves cor-
rectly
2 Geared motor (if any)
Supply the spring loading geared motor
at the corresponding rated voltage.
Carry out some closing and opening
operations.
Note. Supply the undervoltage release
at the corresponding rated voltage (if
any).
The springs are loaded correctly.
The signals are correct.
The geared motor stops with the
springs loaded.
The geared motor reloads the springs
after each closing operation.
3 Undervoltage release (if any)
Supply the undervoltage release at the
corresponding rated voltage and carry
out the circuit-breaker closing opera-
tion.
Disconnect voltage to the release.
Supply the undervoltage release at the
corresponding rated voltage and carry
out the circuit-breaker closing opera-
tion.
The circuit-breaker closes correctly. The
signals are correct.
The circuit-breaker opens. The signal
changes over..
4 Shunt opening release (if any)
Close the circuit-breaker.
Supply the shunt opening release at the
corresponding rated voltage.
The circuit-breaker opens correctly. The
signals are correct..
5 Shunt closing release (if any)
Open the circuit-breaker.
Loading the springs.
Supply the shunt closing release at its
rated voltage.
The circuit-breaker closes correctly. The
signals are correct.
6 Circuit-breaker lock in the open
position (with key or padlocks)
Open the circuit-breaker, turn the key
and remove it from its seat. Attempt
circuit-breaker closing operation.
Both manual and electrical closing are
prevented.
7 Auxiliary contacts of the circuit-
breaker
Insert the auxiliary contacts in suit-
able signalling circuits. Carry out some
circuit-breaker closing and opening
operations.
The signals are given correctly..
8 Auxiliary contacts for signalling
circuit-breaker connected, test iso-
lated and disconnected
Insert the auxiliary contacts in suitable
signalling circuits. Then put the circuit-
breaker in the connected, test isolated
and disconnected position.
The signals due to the relative opera-
tions are given correctly..
9 Lock devices for circuit-breakers
connected and disconnected.
Interlocking devices between circuit-
breakers side by side and one on
top of another (if any)
Carry out the operating tests.
The locks function correctly.
10 For withdrawable circuit-breakers:
racking -in/out device
Carry out some racking-in and out
operations.
Racking-in operation: the circuit-
breaker racks in correctly. The fi rst turns
of the crank handle do not meet with
particular resistance.
WARNING: When undervoltage release has been activated by an undervoltage event, the circuit-breaker can
only be closed after the release has been electrically energized. Ensure that an undervoltage condition existed
at the time the release was activated. If not, investigate circuit-breaker and associated equipment to ensure they
are in proper working order. If application is critical, investigate immediately.
