Panels With Motor Operating Mechanism Control; Overview Of Functionality - Siemens NXAIR Operating Instructions Manual

Panels with motor operating mechanism control

27 Panels with motor operating mechanism control

27.1 Overview of functionality

Circuit-breaker panels can optionally be equipped with motor operating mechanism control as an electrical
operating mode (as opposed to manual operating mode) for the following functions:
•
Racking the withdrawable circuit-breaker / circuit-breaker truck from test position to service position,
and from service position to test position
•
Switching the feeder earthing switch to CLOSED position or OPEN position
•
Switching the busbar earthing switch to CLOSED position or OPEN position
Manual operation versus electrical operation
For the mentioned functions, manual operation and electrical operation can be operated independently from
one another. Hence, any combination is possible:
Withdrawable circuit-breaker /
circuit-breaker truck:
Racking
Electrical or manual operation
Electrical or manual operation
Manual operation only
Manual operation only
Central versus local control
All functions possible from the central control can also be operated locally at the panel, either manually or
electrically. For safe and consistent operation, it is not possible to operate from the central control and locally
at the same time. Depending on the design of the panel version, switching between local and central control
is carried out in different ways, for example via a local-remote switch located on the door to the low-voltage
compartment.
Fig. 694: Example of a local-remote switch
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INFORMATION
Read and understand these instructions before attempting operating works.
Feeder earthing switch:
Switching
Manual operation only
Electrical or manual operation
Manual operation only
Electrical or manual operation
NXAIR / ≤ 40 kA
Busbar earthing switch:
Switching
Manual operation only
Electrical or manual operation
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