ABB ACS550-01 User Manual page 91

ACS550 User's Manual
Code Description
3501 SENSOR TYPE
Identifies the type of motor temperature sensor used, PT100 (°C) or PTC (ohms).
See parameters 1501 and 1507.
0 =
NONE
1 = 1 x PT100 – Sensor configuration uses one PT 100 sensor.
• Analog output
AO
• 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
degrees centigrade.
2 = 2 x PT100 – Sensor configuration uses two PT 100 sensors.
• Operation is the same as for above 1 x PT100.
3 = 3 x PT100 – Sensor configuration uses three PT 100 sensors.
• Operation is the same as for above 1 x PT100.
4 = – Sensor configuration uses one PTC.
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
the voltage over the resistor. The temperature measurement function
reads the voltage through analog input
• The figure shows typical PTC sensor resistance values as a function of
the motor operating temperature.
Temperature
Normal
Excessive
3502 INPUT SELECTION
Defines the analog input used for the temperature sensor.
1 = 1
AI
2 = 2
AI
3503 ALARM LIMIT
Defines the alarm limit for motor temperature measurement.
• At motor temperatures above this limit, the drive displays an alarm (
3504 FAULT LIMIT
Defines the fault limit for motor temperature measurement.
• At motor temperatures above this limit, the drive displays a fault (
1 or 2 feeds constant current through the sensor.
AO
1 and converts it into ohms.
AI
Resistance
0 ... 1.5 kohm
> 4 kohm
1 or
AI
Ohm
4000
1330
), as does
ref
550
100
MOTOR OVERTEMP
) and stops the drive.
MOTOR OVERTEMP
91
2 and converts it to
AI
)
Start-Up
T