Danfoss VLT HVAC Drive User 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
Motor Thermal Protection to Thermistor Trip [2]
Set Par. 1-93
Thermistor Source to Digital Input 33 [6]
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
Motor Thermal Protection to Thermistor Trip [2]
Set Par. 1-93
Thermistor Source to Digital Input 33 [6]
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
Motor Thermal Protection to Thermistor Trip [2]
Set Par. 1-93
Thermistor Source to Analog Input 54 [2]
Do not select a reference source.
VLT
®
HVAC Drive Instruction Manual
6. How to program the adjustable frequency
drive
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark 79
6

Danfoss VLT HVAC Drive Specifications

General

Type	VLT HVAC Drive
STO (Safe Torque Off)	Yes
Enclosure	IP20
Output Frequency	0-500 Hz
Brake Chopper	Built-in (depending on frame size)
EMC Filter	Built-in (depending on frame size)
Communication	Ethernet
Power Range	0.37 kW to 630 kW
Input Voltage	200-240V, 380-480V, 525-600V
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Ambient Temperature	-10°C to +50°C (with derating above +40°C)
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% (non-condensing)
Cooling Method	Air-cooled