ABB Johnson Controls AYK550-UH, User Manual

Page: 142 / 348

1-142 A
<.
550-UH User’s Manual
Parameters
For other faults, or for anticipating motor overheating using a model, see Group 30:
FAULT FUNCTIONS .
Group 35: Motor Temp Meas
Code Description Range Resolution Default S
3501 SENSOR TYPE 0…6 1 0 (
NONE
)
Identifies the type of the 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 PT100 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 one 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 table below and the graph show typical PTC sensor resistance
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.
• When the digital input is ‘0’, the motor is overheated.
• See the connection figure on page
1-141 .
• The table below and the graph show the resistance requirements for a PTC sensor connected between 24 V and
a digital input as a function of the motor operating temperature.
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.
• When the digital input is ‘1’, the motor is overheated.
• See the connection figure on page
1-141 .
3502 INPUT SELECTION 1…8 1 1 (
AI
1)
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 and PTC
T
Excessive
Normal
Temperature Resistance
Normal < 1.5 kohm
Excessive > 4 kohm
Temperature Resistance
Normal < 3 kohm
Excessive > 28 kohm