ABB PSTX30 Installation And Commissioning Manual page 87

7.12.4 Temperature sensor
Temperature inputs
There is one temperature input. The user can set three
different types of temperature sensors:
• PTC
• PT100
• Bi-metal switch
These can be connected to different protections.
A protection can be set to switch 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
measuring shall follow the standard for a Mark-A detector
according to IEC60947-8.
The temperature control system has a short circuit
detector that will detect if the input resistance is less than
10 ohm. This detector will only work if the total length of
the connected cable is less than 10 ohm i.e. about 140 m
with 0,5 mm² cable, 240m with 1,0 mm² cable and 440m
with 1,5 mm². If a short circuit is detected then the error is
reported to the user.
It is possible to detect if a sensor is connected to the
softstarter.
It is also possible to enable the temperature measurement
and to manual 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 measuring shall have an accuracy of +/-3°
with three wires measuring if the three connecting cables
have the same resistance.
If a short circuit is detected then the error is reported
to the user. The softstarter is also be able to detect if a
sensor is connected to the softstarter.
It is possible to enable the temperature measurement. It is
also possible to perform a manual reset, automatic reset
or to indications only.
Bi-metal switch
It is possible to combine temperature input with bi-metal
switches or thermo click elements for detecting
temperature. These temperature sensors behave like a
switch that opens or close at the trip temperature. Both
types (NO – normally open or NC – normally closed) is
supported and short circuit detection must be turned off
since it is not applicable. The maximum current through
the bi-metal switches is 100 mA.
Temperature sensor is configured with the following
parameters: See chapter 7.14.14
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