ABB ACS355 series User Manual page 268

268 Actual signals and parameters
All parameters
No. Name/Value
PTC
THERM(0)
THERM(1)
3502 INPUT
SELECTION
AI1
AI2
DI1
DI2
Description
The function is active. The temperature is supervised using
one PTC sensor. Analog output AO feeds constant current
through the sensor. The resistance of the sensor increases
sharply as the motor temperature rises over the PTC
reference temperature (Tref), as does the voltage over the
resistor. The temperature measurement function reads the
voltage through analog input AI1/2 and converts it into
ohms. The figure below shows typical PTC sensor
resistance values as a function of the motor operating
temperature.
Temperature
Normal
Excessive
ohm
4000
1330
550
100
The function is active. Motor temperature is monitored using
a PTC sensor (see selection PTC) connected to drive
through a normally closed thermistor relay connected to a
digital input. 0 = motor overtemperature.
The function is active. Motor temperature is monitored using
a PTC sensor (see selection PTC) connected to drive
through a normally open thermistor relay connected to a
digital input. 1 = motor overtemperature.
Selects the source for the motor temperature measurement
signal.
Analog input AI1. Used when Pt100 or PTC sensor is
selected for the temperature measurement.
Analog input AI2. Used when Pt100 or PTC sensor is
selected for the temperature measurement
Digital input DI1. Used when parameter
TYPE value is set to THERM(0)/THERM(1).
Digital input DI2. Used when parameter
TYPE value is set to THERM(0)/THERM(1).
Resistance
0...1.5 kohm
> 4 kohm
T
3501 SENSOR
3501 SENSOR
Def/FbEq
4
5
6
AI1
1
2
3
4