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Connecting
6.2 Electrical connection
6.2.12
Temperature evaluation using the PTC thermistor triplet (full motor protection,
option)
For special applications (e.g. when a load is applied with the motor stationary or for
extremely low speeds), the temperature of all of the three motor phases must be additionally
monitored using a PTC thermistor triplet.
Note
If water-cooled synchronous built-in motors are operated for longer than one minute in
standstill with the standstill torque, a phase can be thermally loaded overproportionately.
• Reduce the permanent standstill torque to 20%.
• Protect the winding thermally with a thermistor triplet (PTC) with an external trip unit or
with an I
The PTC thermistor triplet must be evaluated using an external tripping/evaluation unit (this
is not included in the scope of delivery). This means that the sensor cable is monitored for
wire breakage and short-circuit by this unit.
The motor must be de-energized within 1 second when the response temperature is
exceeded.
Table 6- 2
Type (acc. to DIN 44082–M180)
Thermistor resistance (20° C)
Resistance when hot (180° C)
Connection
Cable cross-section/outer diameter
Response temperature
Note: PTC thermistors do not have a linear characteristic curve and are, therefore, not suitable for
determining the instantaneous temperature.
114
t monitoring of the drive system.
2
Technical data for the PTC thermistor triplet
Designation
Technical data
PTC thermistor triplet
≤ 750 Ω
≥ 1710 Ω
Via an external trip unit
0.14 mm
/0.9 mm
2
180° C
1FE1 synchronous built-in motors
Hardware Installation Manual, 12/2016, 610.43000.40b
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