Danfoss VLT AQUA Drive FC 202 Design Manual page 41

Introduction
R
(Ω)
4000
3000
1330
550
250
 nominel -5°C
-20°C
Illustration 2.27 Trip
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 1-90 Motor Thermal Protection to [2] Thermistor Trip
Set 1-93 Thermistor Source to [6] Digital Input 33
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Illustration 2.28 Digital Input and 24 V Power Supply
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:
Set 1-90 Motor Thermal Protection to [2] Thermistor Trip
Set 1-93 Thermistor Source to [6] Digital Input 33
MG20Z202
Design Guide
 [°C]
 nominel +5°C
 nominel
OFF
ON
<6.6 k Ω >10.8 k Ω R
Danfoss A/S © Rev. 06/2014 All rights reserved.
39 42 50 53 54 55
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Illustration 2.29 Digital Input and 10 V Power Supply
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 1-90 Motor Thermal Protection to [2] Thermistor Trip
Set 1-93 Thermistor Source to [2] Analog Input 54
Do not select a reference source.
39 42 50 53 54 55
PTC / Thermistor
Illustration 2.30 Analog Input 10 V Power Supply
Input Supply Voltage
Digital/analog V
Cut-out Values
Digital 24
Digital 10
Analog 10
NOTICE
Check that the chosen supply voltage follows the specifi-
cation of the used thermistor element.
OFF
ON
R
<800 Ω >2.7 kΩ
OFF
ON
<3.0 k Ω R
>3.0 k Ω
Threshold
Cut-out Values
< 6.6kΩ - > 10.8kΩ
< 800Ω - > 2.7kΩ
< 3.0kΩ - > 3.0kΩ
39
2 2