Danfoss FC 300

2.4.10. 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 (par. 1-30) for PM motors and also rotor re-
sistance (par. 1-31) for asynchronous motors, depending on winding temperature. The calculation
is:
Rs = Rs
20° C
x
(
1+α
cu
x Δ T
)
Ω
where
α
cu
= 0.00393
KTY sensors can be used for motor protecting (par 1-97).
FC 302 can handle three types of KTY sensors, defined in par 1-95. The actual sensor temperature
can be read out from par 16-19.
NB!
If the temperature of the motor is utilized through a thermistor or KTY sensor the
PELV is not complied with in case of short circuits between motor windings and
sensor. In order to comply with PELV the sensor must be extra isolated.
1-95 KTY Sensor Type
Option: Function:
Select the used type of KTY sensor:
KTY Sensor type 1: 1Kohm at 100 degrees C
KTY Sensor type 2: 1Kohm at 25 degrees C
KTY Sensor type 3: 2Kohm at 25 degrees C
This parameter only applies for FC 302.
[0] *
KTY Sensor 1
[1] KTY Sensor 2
[2] KTY Sensor 3
2. How to Programme FC 300 Programming Guide
62 MG.33.M2.02 - VLT
®
is a registered Danfoss trademark
2