Commissioning The Mccb; General Procedures - Allen-Bradley 140G-R Installation Instructions Manual

6

Commissioning the MCCB

6.1

General procedures

– Make sure that the power connections to the circuit breaker terminals are tight
– Make adjustments to the trip unit protection functions [LSIG].
– Make sure that voltage of the auxiliary circuits is between 85% and 110% of the rated voltage
– To avoid temperature rises, make sure that there is suffi cient air exchange in the installation area
– Also perform the inspections indicated in the following table.
Item inspected
1 Manual operating mechanism
2 Spring charging motor (if provided)
3 Undervoltage release
(if provided)
4 Shunt opening release (if provided)
5 Shunt closing release (if provided).
6 Lock for circuit breaker in open position
(key or padlock)
7 Auxiliary circuit breaker contacts
DIR 1000682R0002 Version 03
Procedure
Perform a few opening, closing and release
operations (see chap. 7.2).
WARNING
When there is an undervoltage release, the cir-
cuit breaker can only be closed after the release
itself has been electrically energized.
Operate the Charging motor at the rated voltage.
Perform a few closing and opening operations.
Note. Supply the undervoltage release at the
rated voltage (if provided).
Supply the undervoltage release at the rated
voltage and perform the circuit breaker clos-
ing operation.
Turn off the voltage supply to the release.
Supply the undervoltage release at the rated
voltage and perform the circuit breaker clos-
ing operation.
Close the circuit breaker.
Supply the shunt opening release at the rated
voltage.
Open the circuit breaker.
Power the shunt closing release at the its
rated voltage.
Open the circuit breaker, turn the key and
remove it. Attempt the circuit breaker closing
operation.
Connect the auxiliary contacts to signalling
circuits. Perform a few circuit breaker closing
and opening operations.
(10)
Successful check
The spring loading lever moves normally.
The springs are loaded normally.
The signals are normal.
The motor stops when the springs have been
loaded.
The motor reloads the springs after each
closing operation.
The circuit breaker closes normally. The signals
are normal.
The circuit breaker opens. The signal changes
over.
The circuit breaker opens normally. The signals
are normal.
The circuit breaker closes normally. The signals
are normal.
Both manual and electrical closing are pre-
vented.
Signalling occurs normally.