Danfoss VLT AutomationDrive FC 302 Instruction Manual page 59

Programming
PTC Thermistor Connection
Figure 6.2 PTC profile
Using a digital input and 10 V as power supply:
Example: The adjustable frequency drive trips when the
motor temperature is too high.
Parameter set-up:
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip
Set parameter 1-93 Thermistor Source to [6] Digital Input
39 42 50 53 54 55
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Figure 6.3 Example with Digital Input and 10 V Power Supply
MG37A222
Instruction Manual
OFF
ON
R
<800 Ω >2.7 kΩ
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
Using an analog input and 10 V as power supply:
Example: The adjustable frequency drive trips when the
motor temperature is too high.
Parameter set-up:
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip
Set parameter 1-93 Thermistor Source to [2] Analog Input 54
Figure 6.4 Example with Analog Input and 10 V Power Supply
Input Supply Voltage
Digital/analog [V]
Digital 10
Analog 10
Table 6.2 Threshold Cut-out Values for Figure 6.3 and Figure 6.4
NOTICE!
Check that the selected supply voltage follows the
specification of the thermistor element.
Threshold
Cut-out Values
< 800 Ω - > 2.7 kΩ
< 3.0 kΩ - > 3.0 kΩ
57
6 6