Kty Sensor Connection; Etr - Danfoss VLT AutomationDrive EZ FC 321 Programming Manual

VLT® AutomationDrive EZ FC 321
Programming Guide

4.2.10.2 KTY Sensor Connection

KTY sensors are used especially in permanent magnet servo motors (PM motors) for dynamic adjusting of motor parameters as sta-
tor resistance (parameter 1-30 Stator Resistance (Rs)) for PM motors and also rotor resistance (parameter 1-31 Rotor Resistance (Rr)) for
asynchronous motors, depending on winding temperature. The calculation is:
Rs = Rs x (1 + α x ΔT) Ω where α
20° C cu
KTY sensors can be used for motor protecting (parameter 1-97 KTY Threshold level). can handle 3 types of KTY sensors, defined in
parameter 1-95 KTY Sensor Type. The actual sensor temperature can be read out from parameter 16-19 KTY sensor temperature.
4500
4000
3500
3000
2500
2000
1500
1000
500
0
-25 0 25
KTY type 1
Illustration 37: KTY Type Selection
KTY Sensor 1: 1 kΩ at 100 °C (212 °F) (for example Philips KTY 84-1)
KTY Sensor 2: 1 kΩ at 25 °C (77 °F) (for example Philips KTY 83-1)
KTY Sensor 3: 2 kΩ at 25 °C (77 °F) (for example Infineon KTY-10)
If the temperature of the motor is utilized through a thermistor or KTY sensor, the PELV is not complied with if there are short
circuits between motor windings and the sensor. Put extra isolation on the sensor to comply with PELV.

4.2.10.3 ETR

The calculations estimate the need for a lower load at lower speed due to less cooling from the fan incorporated in the motor.
94 | Danfoss A/S © 2021.08
= 0 . 00393
cu
50 75 100 125 150
Temperature [°C]
KTY type 2 KTY type 3
N O T I C E
Parameter Descriptions
AU373327181955en-000101 / 130R1208