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Automation VT Drive FC322 Design Guide
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when the motor temperature 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 temperature is
too high.
Parameter set-up:
Motor Thermal Protection
Thermistor Trip
Set par. 1-90
to
[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 temperature 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
Supply Voltage
Digital/analog
Volt
Digital
24 V
Digital
10 V
Analog
10 V
NB!
Check that the chosen supply voltage follows the specification of the used thermistor element.
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 over
heated and there is no need for any further motor protection. That means when the motor is heated up the ETR timer controls for how long time the
motor can be running at the high temperature before it is stopped in order to prevent over heating. If the motor is overloaded without reaching the
temperature where the ETR shuts of the motor, the torque limit is protecting the motor and application for being overloaded.
MG.20.X1.22 - VLT
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20783-Danfoss-131X8145-VLT-Automation-VT-Drive-VFD-FC322-460V-.5-HP.aspx
2 Introduction to VLT Automation VT Drive
Threshold
Cut-out Values
< 6.6 kΩ - > 10.8 kΩ
< 800Ω - > 2.7 kΩ
< 3.0 kΩ - > 3.0 kΩ
®
is a registered Danfoss trademark
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