3.3.11 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
Stator Resistance (Rs)
) for PM motors and also rotor resistance (par. 1-31
Rotor Resistance (Rr)
) 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
KTY Threshold level
).
FC 302 can handle three types of KTY sensors, defined in par. 1-95
KTY Sensor Type
. The actual sensor temperature can be read out from par. 16-19
KTY
sensor temperature
.
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. This parameter is available for FC 302 only.
[0] * KTY Sensor 1
1 k at 100
o
C
[1] KTY Sensor 2
1 k at 25
o
C
[2] KTY Sensor 3
2 k at 25
o
C
1-96 KTY Thermistor Resource
Option: Function:
Selecting analog input terminal 54 to be used as KTY sensor input. Terminal 54 cannot be selected
as KTY source if otherwise used as reference (see par. 3-15
Reference Resource 1
to
par. 3-17
Reference Resource 3
).
This parameter is available for FC 302 only.
NB!
Connection of KTY-sensor between term. 54 and 55 (GND). See picture in section
KTY Sensor Connection
.
[0] * None
[2] Analog input 54
FC 300 Programming Guide 3 Parameter descriptions
MG.33.M8.02 - VLT
®
is a registered Danfoss trademark
63
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