Danfoss VLT HVAC Drive Instruction Manual page 79

VLT ® HVAC Drive Instruction Manual
Integrate a thermistor (PTC sensor) in the motor for winding
protection.
Motor protection can be implemented using a range of techni-
ques: PTC sensor in motor windings; mechanical thermal switch
(Klixon type); or Electronic Thermal Relay (ETR).
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when the motor tem-
perature is too high.
Parameter set-up:
Set Par. 1-90
Set Par. 1-93
Using a digital input and 10 V as power supply:
Example: The frequency converter trips when the motor tem-
perature is too high.
Parameter set-up:
Set Par. 1-90
Set Par. 1-93
Using an analog input and 10 V as power supply:
Example: The frequency converter trips when the motor tem-
perature is too high.
Parameter set-up:
Set Par. 1-90
Set Par. 1-93
Do not select a reference source.
MG.11.A4.22 - VLT ® is a registered Danfoss trademark
6. How to program the adjustable frequency
Motor Thermal Protection
to
Thermistor Source Digital Input 33
to
Motor Thermal Protection
to
Thermistor Source to Digital Input 33
Motor Thermal Protection
to
Thermistor Source Analog Input 54
to
drive
Thermistor Trip
[2]
[6]
Thermistor Trip
[2]
[6]
Thermistor Trip
[2]
[2]
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