ABB ACS550 Series, User Manual

Page: 151 / 310

ACS550 User’s Manual 151
Parameters
For other faults, or for anticipating motor overheating using a model, see Group 30:
FAULT FUNCTIONS .
Code Description
3501 SENSOR TYPE
Identifies the type of motor temperature sensor used, PT100 (°C), PTC (ohm) or thermistor.
See parameters 1501
AO
1
CONTENT SEL
and 1507
AO
2
CONTENT SEL
.
0 =
NONE
1 = 1 x PT100 – Sensor configuration uses one PT 100 sensor.
• Analog output
AO
1 or
AO
2 feeds constant current through the sensor.
• The sensor resistance increases as the motor temperature rises, as does the voltage over the sensor.
• The temperature measurement function reads the voltage through analog input
AI
1 or
AI
2 and converts it to
degrees Celsius.
2 = 2 x PT100 – Sensor configuration uses two PT100 sensors.
• Operation is the same as for above 1 x PT100.
3 = 3 x PT100 – Sensor configuration uses three PT100 sensors.
• Operation is the same as for above 1 x PT100.
4 =
PTC
– Sensor configuration uses PTC.
• The analog output feeds a constant current through the sensor.
• The resistance of the sensor increases sharply as the motor
temperature rises over the PTC reference temperature ( T
ref
), as does
the voltage over the resistor. The temperature measurement function
reads the voltage through analog input
AI
1 and converts it into ohms.
• The figure shows typical PTC sensor resistance values as a function of
the motor operating temperature.
5 =
THERM
(0) – Sensor configuration uses a thermistor.
• Motor thermal protection is activated through a digital input. Connect either a PTC sensor or a normally closed
thermistor relay to a digital input. The drive reads the digital input states as shown in the above table.
• When the digital input is ‘0’ the motor is overheated.
• See the figures in the introduction to this group.
6 =
THERM
(1) – Sensor configuration uses a thermistor.
• Motor thermal protection is activated through a digital input. Connect a normally open thermistor relay to a digital
input. The drive reads the digital input states as shown in the table above.
• When the digital input is ‘1’ the motor is overheated.
• See the figures in the introduction to this group.
3502 INPUT SELECTION
Defines the input used for the temperature sensor.
1 =
AI
1 – PT100 and PTC.
2 =
AI
2 – PT100 and PTC.
3…8 =
DI
1…
DI
6 – Thermistor
3503 ALARM LIMIT
Defines the alarm limit for motor temperature measurement.
• At motor temperatures above this limit, the drive displays an alarm (2010,
MOTOR TEMP
)
For thermistors:
0 – de-activated
1 – activated
3504 FAULT LIMIT
Defines the fault limit for motor temperature measurement.
• At motor temperatures above this limit, the drive displays a fault (9,
MOT OVERTEMP
) and stops the drive.
For thermistors:
0 – de-activated
1 – activated
100
550
1330
4000
ohm
T
Temperature Resistance
Normal < 3 kohm
Excessive > 28 kohm