96 Functions | Installation and commissioning manual | 1SFC132081M0201
7.14.5 Temperature sensor
Temperature inputs
There is 1 temperature input. The user can set 3 different
types of temperature sensors: See chapter Temperature
sensors 7.17.14
• PTC
• PT100
• Bi-metal switch
These can be connected to different protections.
A protection can come on if a particular temperature
occurs.
PTC
The PTC temperature input can measure a motor
temperature in the range of -25° to 250°. The PTC
measurement obeys the standard for a Mark-A detector.
Refer to IEC60947-8.
The unit can sense if a sensor is connected to the
Softstarter. You can also enable the temperature
measurement and manually reset, automatic reset or get
indication only.
PT100
The Softstarter has a 3-wire PT100 input that can be
combined and share terminals with the PTC input.
The trip temperature is set by the user. The maximum trip
temperature is 250° and lowest is -25°.
The PT100 measurement must have an accuracy of +/-3°
with 3 wires measuring if the 3 connecting cables have
the same resistance.
If a short circuit is detected then the error is reported
to the user. The Softstarter can sense if a sensor is
connected to the Softstarter.
You can enable the temperature measurement. You can
do a manual reset, automatic reset or to indications only.
Bi-metal switch
This function will be implemented in next release.
You can combine temperature input with bi-metal
switches for detecting overtemperature. These
temperature sensors behave like a switch that opens or
close at the trip temperature. Each type (NO – normally
open or NC – normally closed) is supported. The
maximum current through the bi-metal switches is 100
mA.
7
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