Danfoss VLT FC 102 Installation Manual page 27

Electrical Installation
1
PE
2
PE
1 Correct grounding of shielded ends
2 Incorrect grounding using twisted shield ends (pigtail)
Illustration 5.2 Example of Shield Ends
5.7.2 Types of Thermal Protection
5.7.2.1 PTC Thermistor
Using a digital input and 10 V supply
39 42 50 53 54 55
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Illustration 5.3 PTC Thermistor Connection - Digital Input with
10 V Supply
Using an analog input and 10 V supply
39 42 50 53 54 55
PTC / Thermistor
Illustration 5.4 PTC Thermistor Connection - Analog Input with
10 V Supply
MG37K302
Installation Guide
PE
PE
OFF
ON
R
<800 Ω >2.7 kΩ
OFF
ON
<3.0 k Ω R
>3.0 k Ω
Danfoss A/S © 08/2017 All rights reserved.
Using a digital input and 24 V as supply
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Illustration 5.5 PTC Thermistor Connection - Digital Input with
24 V Supply
Check that the selected supply voltage follows the specifi-
cation of the used thermistor element.
Input digital/ Supply Trip resistance
analog voltage [V] kΩ
Digital 10 >2.7
Analog 10 >3.0
Digital 24 >10.8
Table 5.9 PTC Thermistor Resistance Parameters
OFF
ON
<6.6 k Ω >10.8 k Ω R
Reset
resistance
<800 Ω
<3.0 kΩ
<6.6 kΩ
25
5 5