ABB ACH550-01 User Manual page 268

ACH550-01 User's Manual
Code Description
3501 SENSOR TYPE
Identifies the type of the motor temperature sensor used, PT100 (°C),
PTC (ohms) or thermistor.
See parameters 1501
0 =
NONE
1 = 1 x PT100 – Sensor configuration uses one PT100 sensor.
• Analogue output
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
analogue input
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 one PTC.
• The analogue 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 ), as does the voltage
ref
over the resistor. The
temperature measurement
function reads the voltage
through analogue input
and converts it into ohms.
• The table below and the graph above show typical PTC sensor
resistance as a function of the motor operating temperature.
Temperature
Normal
Excessive
Parameter listing and descriptions
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1
AO CONTENT SEL
1 or 2 feeds constant current through the
AO AO
1 or 2 and converts it to degrees Celsius.
AI AI
Excessive
Normal
1
AI
Resistance
< 1.5 kohm
> 4 kohm
Range
0...6
and 1507 2
AO CONTENT SEL
.
T
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