1PH7/3-117
Siemens AG, 2004. All rights reserved
Induction Motors, 1PH7 (APH7S) – 05.04 Edition
Motor Components
3.1 Thermal motor protection
Table 3-1 Features and technical data
Type
KTY 84
Resistance when cold (20 °C) approx. 580 Ohm
Resistance when hot (100 °C): approx. 1000 Ohm
Connecting Using the encoder cable
Response temperature Warning < 120 °C
Alarm/shutdown at max. 155 °C 5 °C
The resistance change is proportional to the winding temperature change. For
1PH7 motors, the temperature characteristic is taken into account in the closed-
loop control.
The warning signal from the evaluation circuit in the SIMODRIVE drive converter
can be externally evaluated.
High short-time overload conditions require additional protective measures. This is
due to the thermal coupling time of the sensor. If the overload condition (4 M
0
)
lasts longer than 4 s, additional protection should be provided.
The temperature sensor cables are included in the encoder 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 only one terminal of the temperature sensor, it will
be destroyed.
3
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