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Explanations
1. The isolating distances between live and de-energized parts of the system must vary
according to the operating voltage that is applied.
"Isolate" refers to the all-pole disconnection of live parts.
All-pole disconnection can be achieved, e.g. by.:
- Switching off the miniature circuit breaker
- Switching off the motor circuit breaker
- Unscrewing fusible links
- Removing LV HRC fuses
2. The feeder must be locked against inadvertent reconnection to ensure that it remains
isolated for the duration of the work. This can be achieved, for instance, by locking the motor
and system circuit breakers in the OFF position or by unscrewing the fuses and using lockable
elements to prevent them from being reinserted.
3. The de-energized state of the equipment should be verified using suitable test equipment,
e.g. a two-pole voltmeter. Single-pole test pins are not suitable for this purpose. The absence
of power must be established for all poles, phase to phase, and phase to N/PE.
4. Grounding and short-circuiting are only mandatory if the system has a nominal voltage
greater than 1 kV. In this case, the system should always be grounded first and then
connected to the live parts to be short-circuited.
5. These parts should be covered, or barriers erected around them, to avoid accidental contact
during the work with adjacent parts that are still live.
2.3
Reactive power compensation
Capacitors for improving the power factor (reactive power compensation)
Do not connect any capacitors to the output terminals of the 3RW5 soft starter. If capacitors are
connected to the output terminals, the 3RW5 soft starter will be damaged.
Do not operate active filters, e.g. for reactive power compensation, parallel to the 3RW5 soft
starter.
If you use capacitors to correct the power factor (actively or passively), you must connect them
on the line side of the 3RW5 soft starter. Make sure that the capacitors do not actively control the
power factor during the starting and coasting down phases. If you use a contactor disconnector
or main contactor together with the 3RW5 soft starter, the capacitors must be disconnected
from the 3RW5 soft starter when the contactor is open.
You will find further information in the Internet
support.industry.siemens.com/cs/ww/en/view/67131557).
2.4
Electromagnetic compatibility (EMC) according to IEC 60947-4-2
This product is designed for Environment A. It may produce radio interference in domestic
environments, in which case the user may be required to take adequate mitigation measures.
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
2.4 Electromagnetic compatibility (EMC) according to IEC 60947-4-2
(https://
Safety information
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