Siemens SIMOTICS T-1FW68, Configuration Manual

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Electrical connection
8.3 System integration
1FW68 radial segment motors
158
Configuration Manual, 08/2021, A5E51132930B AA
Connection of circuit breaker
For the following configurations, you require a circuit breaker for each stator segment:
• Several stator segments are connected in parallel to one Motor Module.
• The current-carrying capacity of the feeder cable cross-section is less than the
current load capability of the Motor Module.
Connect all of the stator segments to be connected in parallel to a Motor Module via a
circuit breaker.
• Connect phases U, V, W of the particular stator segment to the corresponding
terminals of the associated circuit breaker:
U - L1
V - L2
W - L3
• Connect phases U, V, W of the Motor Module to the circuit breaker terminals:
U - T1
V - T2
W - T3
• Connect the auxiliary NO contacts of the circuit breaker in series.
• Connect the auxiliary NO contacts to an input on the CU/NCU.
• Connect the auxiliary NO contact to an external drive fault of the drive using BICO
technology. This means that when a circuit breaker trips, the complete drive is shut
down (OFF2).
• You can also evaluate the auxiliary NO contact of the circuit breaker using the PLC.
• Adjust the circuit breaker to the rated current of the motor feeder 10%.
Avoiding false circuit breaker tripping
At the following link you can find information in the Internet on the topic of "Influence of
high-frequency currents on thermal overload trips of circuit breakers (3RV, 3VU) and
overload relays (3RU, 3UA)" and "Additional effects that can result in false trips".
FAQ entry ID: 24153083
http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&objid=241530
83&nodeid0=20358027&caller=view&lang=de&extranet=standard&viewreg=WW&u=ND
AwMDAxNwAA&siteID=cseus