Siemens NXPLUS C Installation And Operating Instructions Manual page 123

Activating undervoltage
release
Electrical function test
802-9074.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C Wind • Revision 05
The undervoltage releases mounted in the circuit-breaker must be activated.
The circuit-breaker operating mechanism is located in the central part of the panel behind the
ON/OFF pushbuttons.
Remove the circuit-breaker front cover.

Shift the retaining screw of the striker from position A to position B to activate the

undervoltage release.
Close the operating mechanism box and refit the cover.

The circuit-breaker operating mechanism is now ready for operation with undervoltage
r
release.
Test operation helps you to verify the perfect operation of the switchgear without high
voltage before commissioning.
ATTENTION!
Before test operation, make sure that the three-position switch is switched to the basic
position, i.e. the position indicators show the OPEN position for the DISCONNECTING and
EARTHING functions.
Do absolutely switch the three-position switch to the basic position by hand.

Switch on all auxiliary and control voltages and verify correct polarity.

The motor of the circuit-breaker operating mechanism starts up, charges the closing spring
r
and closes the circuit-breaker in case of spring-operated mechanisms.
Test panels with electromagnetically interlocked three-position switch only with applied

auxiliary voltage.
Check whether the mechanical and/or electrical interlocking conditions are fulfilled without

using excessive force.
Check whether the switch positions of the three-position switch are displayed correctly.

Switch the three-position switch and the circuit-breaker several times to CLOSED and OPEN

position at the panel and from remote. At the same time, check whether the switch
positions are displayed correctly at the panel and, if applicable, in the control room, and if
the auxiliary switches and position switches operate correctly.
After operating the three-position switch, check whether the operating levers can be

pushed onto the operating shafts. If not, please contact the regional Siemens
representative.
Check the function of the closing solenoid by electrical operation.

Check the function of the shunt releases, c.t.-operated releases and undervoltage releases

by electrical operation.
Installation
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