B2342
Emax VF
14/66
Doc. no.
Model
Apparatus
Scale
Page No
1SDH000909R0001
6. Putting into service
6.1. General procedures
WARNING: The external auxiliary power supply must be always provided to the terminal box (terminal: K1 and
K2) to turn on the trip unit. Without the auxiliary power supply the trip unit does not work and the circuit break-
er is not protected. It is recommended to use a backup battery to guarantee the presence of the Vaux or to add
in the circuit breaker an undervoltage release (YU) to open the circuit breaker even when the auxiliary Vaux does
not work.
- 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 electrical
applications
- Make sure that there is an adequate air circulation in the place of installation to avoid overheating
- Also carry out the checks specified in the following table.
Item inspected
Procedure
Positive check
1 Auxiliary power supply
Open the CB.
Supply the trip unit at 24V DC.
The graphic display turns on.
The word “ABB” scrolls in the bottom left-
hand corner of the display.
2 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 correctly
3 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 cor-
responding 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.
4 Undervoltage release (if any)
Supply the undervoltage release at the corre-
sponding rated voltage and carry out the circuit-
breaker closing operation.
Disconnect voltage to the release.
Supply the undervoltage release at the corre-
sponding rated voltage and carry out the circuit-
breaker closing operation.
The circuit-breaker closes correctly. The
signals are correct.
The circuit-breaker opens. The signal
changes over..
5 Shunt opening release (if any)
Close the circuit-breaker.
Supply the shunt opening release at the corre-
sponding rated voltage.
The circuit-breaker opens correctly. The
signals are correct..
6 Shunt closing release (if any)
Open the circuit-breaker.
Loading the springs.
Supply the shunt closing release at its rated volt-
age.
The circuit-breaker closes correctly. The
signals are correct.
7 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.
8 Auxiliary contacts of the circuit-
breaker
Insert the auxiliary contacts in suitable signalling
circuits. Carry out some circuit-breaker closing
and opening operations.
The signals are given correctly..
9 Auxiliary contacts for signalling
circuit-breaker connected, test
isolated and disconnected
Insert the auxiliary contacts in suitable signalling
circuits. Then put the circuit-breaker in the con-
nected, test isolated and disconnected position.
The signals due to the relative operations
are given correctly..
10 Lock devices for circuit-break-
ers connected and discon-
nected. Interlocking devices
between circuit-breakers side
by side and one on top of an-
other (if any)
Carry out the operating tests.
The locks function correctly.
11 For withdrawable circuit-break-
ers: racking -in/out device
Carry out some racking-in and out operations.
Racking-in operation: the circuit-breaker
racks in correctly. The first 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.