Motor components and options
4.1 Motor components
1FW68 radial segment motors
Configuration Manual, 08/2021, A5E51132930B AA
73
No direct connection of the temperature monitoring circuits
WARNING
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.
You therefore comply with the directives for safe electrical separation according to
EN 61800-5-1 (previously safe electrical separation according to EN 50178).
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, adhere to
the correct assignment of conductor colors as described in "Signal connection
(Page 159)".
4.1.2.2
Technical features of temperature sensors
Technical features of PTC temperature sensors
Every PTC temperature has a "quasi-switching" characteristic. The resistance suddenly
increases in the vicinity of the response threshold (nominal response temperature
ϑ
NAT
).
PTC temperature sensors have a low thermal capacity - and have good thermal contact
with the motor winding. As a consequence, the temperature sensors and the system
quickly respond to inadmissibly high motor winding temperatures.
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