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Motor components
5.1
Thermal motor protection
A temperature-dependent resistor is integrated as temperature sensor to monitor the motor
temperature.
Table 5-1
Type
Resistance when cold (20° C)
Resistance when hot (100° C)
Response temperature
Connection
The resistance of the KTY 84 thermistor changes proportionally to the winding temperature
change (refer to the following Fig.).
Figure 5-1
The KTY 84 is evaluated in the converter whose closed-loop control takes into account the
temperature characteristic of the motor winding. 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
message is ignored, the drive converter shuts down with the appropriate fault message after
a preset time period or when the motor limiting temperature or the shutdown temperature is
exceeded.
1PM6/1PM4 Hollow-Shaft Motors for Main Spindle Drives
Configuration Manual, PPMS, 04/2008, 6SN1197-0AD23-0BP0
Features and technical data
Resistance characteristic of the KTY 84 as a function of the temperature
KTY 84 (PTC thermistor)
approx. 580 Ω
approx. 1000 Ω
Alarm at 120 °C ± 5 °C
Trip at 155 °C ± 5 °C
via signal cable
5
75
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