ABB ACS355 series, User Manual

Page: 268 / 436

268 Actual signals and parameters
PTC 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. 4
THERM(0) 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.
5
THERM(1) 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.
6
3502 INPUT
SELECTION
Selects the source for the motor temperature measurement
signal. AI1
AI1 Analog input AI1. Used when Pt100 or PTC sensor is
selected for the temperature measurement. 1
AI2 Analog input AI2. Used when Pt100 or PTC sensor is
selected for the temperature measurement 2
DI1 Digital input DI1. Used when parameter 3501 SENSOR
TYPE value is set to THERM(0) / THERM(1) .
3
DI2 Digital input DI2. Used when parameter 3501 SENSOR
TYPE value is set to THERM(0) / THERM(1) .
4
All parameters
No.
Name/Value Description Def/FbEq
100
550
1330
4000
ohm
T
Temperature Resistance
Normal 0…1.5 kohm
Excessive > 4 kohm