Motor Components
5.5 Thermal motor protection
5.5
5.5
Thermal motor protection
A temperature-dependent resistor is integrated as temperature sensor to monitor the motor
temperature.
Table 5-3 Features and technical data
Type KTY 84 (PTC thermistor)
Resistance when cold (20°C) approx. 580 Ohm
Resistance when hot (100°C) approx. 1000 Ohm
Connecting via signal cable
The resistance of the KTY 84 thermistor changes proportionally to the winding temperature
change.
The temperature signal is sensed and evaluated in the drive converter whose closed-loop
control takes into account the temperature characteristic of the motor resistances.
When a fault occurs, an appropriate message is output at the drive converter. When the
motor temperature increases, a message "Alarm motor overtemperature" is output; this must
be externally evaluated. If this signal is not observed, the drive converter shuts down with the
appropriate fault message when the motor limiting temperature or the shutdown temperature
is exceeded.
Warning
If the user carries-out an additional high-voltage test, then the ends of the temperature
sensor cables must be short-circuited before the test is carried-out!
If the test voltage is connected to a temperature sensor terminal, then it will be destroyed.
The polarity must be carefully observed.
The temperature sensor is designed so that the DIN/EN requirement for "protective
separation" is fulfilled.
Caution
The integrated temperature sensor protects the synchronous against an overload condition
Shaft heights, 28 to 48 up to 2 ∙ I
060 K
and speed <> 0
from shaft height 63 up to 4∙ I
0 60 K
and speed <> 0
For load applications that are critical from a thermal perspective - e.g. overload when the
motor is stationary or an overload of M
max
longer than 4 s, adequate protection is no longer
available.
General Section for Synchronous Motors
Configuration Manual, (PJAL), 11.2005 Edition, 6SN1 197-0AD07-0BP4
5-11
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