ACH550-UH User’s Manual
1-141
Parameters
For other faults, or for anticipating motor overheating using a model, see
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
• 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
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
Summary of Contents for ACH550-BCR
Page 4: ...iv Manual contents ...
Page 6: ......
Page 12: ...1 8 ACH550 UH User s Manual Table of contents ...
Page 36: ...1 32 ACH550 UH User s Manual Installation ...
Page 70: ...1 66 ACH550 UH User s Manual Application macros ...
Page 335: ...ACH550 UH User s Manual 1 331 Technical data ...
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Page 382: ...2 36 ACH550 E Clipse Bypass User s Manual Start up ...
Page 398: ...2 52 ACH550 E Clipse Bypass User s Manual Bypass functions overview ...
Page 406: ...2 60 ACH550 E Clipse Bypass User s Manual Application macros ...
Page 544: ...2 198 ACH550 E Clipse Bypass User s Manual Embedded fieldbus ...
Page 584: ...2 238 ACH550 E Clipse Bypass User s Manual Diagnostics ...
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Page 612: ...3 6 ACH550 UH User s Manual Table of contents ...
Page 622: ...3 16 ACH550 PCR PDR User s Manual Installation ...
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