Ptc Thermistor Connection; Kty Sensor Connection - Danfoss VLT AutomationDrive Programming Manual

Parameter Descriptions
NOTE!
If [20] is selected, 4-18 Current Limit must be set to 150%.

3.3.10.1 PTC Thermistor Connection

Figure 3.4 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 1-90 Motor Thermal Protection to Thermistor Trip [2]
Set 1-93 Thermistor Source to Digital Input [6]
39 42 50 53 54 55
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
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 1-90 Motor Thermal Protection to Thermistor Trip [2]
Set 1-93 Thermistor Source to Analog Input 54 [2]
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FC 300 Programming Guide
OFF
ON
R
<800 Ω >2.7 kΩ
®
MG33MD22 - VLT is a registered Danfoss trademark
Input Supply Voltage
Digital/analog
Digital 10 V
Analog 10 V
NOTE!
Ensure that the chosen supply voltage follows the specifi-
cation of the thermistor element utilized.

3.3.10.2 KTY Sensor Connection

(FC 302 only)
KTY sensors are used especially in permanent magnet
servo motors (PM motors) for dynamic adjusting of motor
parameters as stator resistance (1-30 Stator Resistance (Rs))
for PM motors and also rotor resistance (1-31 Rotor
Resistance (Rr)) for asynchronous motors, depending on
winding temperature. The calculation is:
where
Rs = Rs 20° C x (1 + α cu x Δ T ) Ω
KTY sensors can be used for motor protecting (1-97 KTY
Threshold level).
FC 302 can handle three types of KTY sensors, defined in
1-95 KTY Sensor Type. The actual sensor temperature can be
read out from 16-19 KTY sensor temperature.
Threshold
Cut-out Values
< 800Ω - > 2.7 kΩ
< 3.0 kΩ - > 3.0 kΩ
α cu = 0.00393
3-25
3 3