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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=24153083&no
deid0=20358027&caller=view&lang=de&extranet=standard&viewreg=WW&u=NDAwMDAxN
wAA&siteID=cseus
8.3.8
Signal connection
No direct connection of the temperature monitoring circuits
Risk of electric shock when incorrectly connecting the temperature monitoring circuit
In the case of a fault, circuits Temp-S and Temp-F do not provide safe electrical separation
with respect to the power components.
• Use the TM120 to connect the Temp-S and Temp-F temperature monitoring circuits.
Correctly connecting temperature sensors
NOTICE
Motor destroyed as a result of overtemperature
The motor can be destroyed as a result of overtemperature if you do not correctly connect
the temperature sensors.
• When connecting temperature sensor cables with open conductor ends, pay attention to
Note
Observe the polarity
Carefully note the polarity when connecting the KTY.
1FW68 radial segment motors
Configuration Manual, 04/2017, 6SN1197-0AE02-0BP1
WARNING
You therefore comply with the directives for safe electrical separation according to
DIN EN 61800-5-1 (previously safe electrical separation according to DIN EN 50178).
the correct assignment of conductor colors.
Electrical connection
8.3 System integration
147
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