ABB ACS550-02 User Manual page 120

118
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) 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 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
5 = (0) – Sensor configuration uses a thermistor.
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 = (1) – Sensor configuration uses a thermistor.
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 above table.
• 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 = 1 – PT100 and PTC.
AI
2 = 2 – PT100 and PTC.
AI
3...8 = 1... 6 – Thermistor
DI DI
3503 ALARM LIMIT
Defines the alarm limit for motor temperature measurement.
• At motor temperatures above this limit, the drive displays an alarm (2010,
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,
For thermistors:
0 = de-activated
1 = activated
Start-Up
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
2 and converts it to
AI
T
)