Thermistor (Fcp 106 Only) - Danfoss VLT DriveMotor FCP 106 Design Manual

System Integration
Activate ETR in parameter 1-90 Motor Thermal Protection.
ETR is controlled in parameter 4-18 Current Limit Mode.

3.3.9.2 Thermistor (FCP 106 only)

3 3
The thermistor is positioned between motor windings. The
connection for the thermistor is placed in the motor plug
at terminal positions T1 and T2. For terminal positions and
wiring details, refer to the section Motor Connection in VLT
DriveMotor FCP 106 and FCM 106 Operating Instructions.
To monitor the thermistor, set parameter 1-90 Motor
Thermal Protection to [1] Thermistor Warning or [2]
Thermistor Trip.
R
(Ω)
4000
3000
1330
550
250
-20 °C
Illustration 3.6 Typical Thermistor Behaviour
38
®
VLT DriveMotor FCP 106/FCM 106
 [°C]
 nominal -5 °C  nominal +5 °C
 nominal
Danfoss A/S © 06/2016 All rights reserved.
When the motor temperature increases the thermistor
value above 2.9 kΩ, the frequency converter trips. When
the thermistor value decreases below 0.8 kΩ, the frequency
converter restarts.
OFF
®
ON
<800 Ω
Illustration 3.7 Frequency Converter Operation with Thermistor
NOTICE
Select the thermistor according to the specification in
Illustration 3.6 and Illustration 3.7.
NOTICE
If the thermistor is not galvanically isolated,
interchanging the thermistor wires with the motor wires
may permanently damage the frequency converter.
A mechanical thermal switch (Klixon type) can be used
instead of a thermistor.
R
>2.9 kΩ
MG03M202