Motor Components (Options)
Thermal motor protection
1FT6 Synchronous Motors
4-4 Configuration Manual, (PFT6), 10.2005 Edition, 6SN1197-0AD02-0BP1
4.3 Thermal motor protection
A temperature-dependent resistor is integrated as temperature sensor to monitor the motor
temperature.
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.
The temperature sensor is designed so that the DIN/EN requirement for "protective separa-
tion" is fulfilled.
Table 4-3 Features and technical data
Type KTY 84
Resistance when cold (20°C) Approx. 580 Ohm
Resistance when hot (100°C) Approx. 1000 Ohm
Connection Via signal cable
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.
Caution
The integrated temperature sensor protects the synchronous against an overload condition
Shaft height 28 to 48 to 2
• I
0 60 K
and speed <> 0
from shaft height 63 up to 4
• I
0 60K
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.
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