Fuse Tripping Check - Siemens NXPLUS C Installation And Operating Instructions Manual

Spring-operated
mechanism
806-9004.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • Revision 02
33.5

Fuse tripping check

Life-endangering voltage
Will cause death, injury or considerable property damage.
Always observe the Five Safety Rules:
➭ Isolate.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.
Hazardous voltage
Can cause death, injury or property damage. If the operating mechanism cover is removed,
do not touch any live parts.
➭ Switch off the auxiliary voltage.
Risk of injury due to high-speed moving parts
Parts behind the front cover can automatically move quickly and cause serious injury.
Do not remove the front cover of the operating mechanism until the following actions have
been performed:
➭ To avoid impermissible switching operations, switch off auxiliary voltage, e.g.:
- Switch off the auxiliary voltage supply of the motor.
- Trip the MCB.
- Disconnect the control cables from the low-voltage compartment.
➭ To discharge the spring energy store in the operating mechanism, execute the following
instructions:
- Push the manual OFF pushbutton.
- Push the manual ON pushbutton.
- Push the manual OFF pushbutton again.
➭ Check if the "spring charged" indicator shows "spring not charged".
The fuse tripping check differs for spring-operated mechanisms and spring-operated/stored-
energy mechanisms
Refers to panel types:
• Vacuum contactor panel
• Metering panel (gas-insulated)
➭ Check the firm seating of all terminal connections ① .
DANGER
WARNING
WARNING
① Terminal connections
② Auxiliary switches
③ Tripping rocker
Service information
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