Using a digital input and 10 V as power supply:
Example: The adjustable frequency drive trips when the motor temper-
ature 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 adjustable frequency drive trips when the motor temper-
ature 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.
Input
Digital/analog
Supply Voltage
Volt
Threshold
Cut-out Values
Digital 24 V < 6.6 kΩ - > 10.8 kΩ
Digital 10 V < 800Ω - > 2.7 kΩ
Analog 10 V < 3.0 kΩ - > 3.0 kΩ
NOTE!
Ensure that the chosen supply voltage follows the specification of the thermistor element utilized.
Summary
With the Torque limit feature, the motor is protected for being overloaded independent of the speed. With the ETR, the motor is protected for being
overheated and there is no need for any further motor protection. That means when the motor is heated up, the ETR timer controls how long the motor
may run at that temperature before it is stopped in order to prevent overheating. If the motor is overloaded without reaching the temperature where the
ETR shuts off the motor, the torque limit protects the motor and application for becoming overloaded.
VLT
®
AQUA Drive Design Guide 2 Introduction to the VLT AQUA Drive
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
2-31
2
To Next Page
Loading...
Need help?
General
