Danfoss VLT AutomationDrive FC 301 Programming Manual page 76

Parameter Descriptions
39 42 50 53 54 55
3 3
PTC / Thermistor
Illustration 3.14 PTC Thermistor Connection - Analog Input
Input
digital/analog
Digital
Analog
Table 3.8 Threshold Cutout Values
NOTICE
Check that the selected supply voltage follows the
specification of the used thermistor element.
3.2.14 KTY Sensor Connection
NOTICE
This is valid for FC 302 only.
KTY sensors are used especially in permanent magnet
servo motors (PM motors) for dynamic adjusting of motor
parameters as stator 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
20° C
KTY sensors can be used for motor protecting
(parameter 1-97 Thermistor Threshold level).
FC 302 can handle 3 types of KTY sensors, defined in
parameter 1-95 Thermistor Sensor Type. The actual sensor
temperature can be read out from
parameter 16-19 Thermistor Sensor Temperature.
74
VLT
OFF
ON
<3.0 k Ω
>3.0 k Ω
Supply voltage Threshold
cutout values
<800 Ω⇒2.7 kΩ
10 V
10 V <3.0 kΩ⇒3.0 kΩ
x ΔT) Ω where α
= 0 . 00393
cu cu
Danfoss A/S © 10/2019 All rights reserved.
®
AutomationDrive FC 301/302
4500
4000
3500
3000
2500
R
2000
1500
1000
500
0
-25
Illustration 3.15 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).
NOTICE
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.
0 25 50 75 100
Temperature [°C]
KTY type 1 KTY type 2
125 150
KTY type 3
M0013101