ABB ACS350 Series, User Manual

Page: 210 / 314

Actual signals and parameters
210
PTC The function is active. The temperature is supervised using 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 via 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 via 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 par. 3501 SENSOR TYPE value is set to
THERMI(0)/(1).
3
DI2 Digital input DI2. Used when par. 3501 SENSOR TYPE value is set to
THERMI(0)/(1).
4
DI3 Digital input DI3. Used when par. 3501 SENSOR TYPE value is set to
THERMI(0)/(1).
5
DI4 Digital input DI4. Used when par. 3501 SENSOR TYPE value is set to
THERMI(0)/(1).
6
DI5 Digital input DI5. Used when par. 3501 SENSOR TYPE value is set to
THERMI(0)/(1).
7
3503 ALARM LIMIT Defines the alarm limit for motor temperature measurement. Alarm MOTOR
TEMP indication is given when the limit is exceeded. When par.
3501
SENSOR TYPE value is set to THERMI(0)/(1): 1 = alarm.
0
x…x Alarm limit -
3504 FAULT LIMIT Defines the fault trip limit for motor temperature measurement. The drive trips
on fault MOT OVERTEMP when the limit is exceeded. When par.
3501
SENSOR TYPE value is set to THERMI(0)/(1): 1 = fault.
0
x…x Fault limit -
Parameters – complete descriptions
Index Name/Selection Description Def, FbEq
100
550
1330
4000
ohm
T
Temperature Resistance
Normal 0 … 1.5 kohm
Excessive > 4 kohm