e
3
0
b
a
1
5
3
.1
1
Illustration 41: PTC Thermistor Connection - Analog Input
Table 146: Threshold Cutout Values
Input digital/analog
Supply voltage
Threshold cutout values
Digital
10 V
<800 Ω
⇒
2.7 kΩ
Analog
10 V
<3.0 kΩ
⇒
3.0 kΩ
N O T I C E
Check that the selected supply voltage follows the specification of the used thermistor element.
5.2.10.2 KTY Sensor Connection
N O T I C E
KTY sensor connection is only available in FC 302.
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
20° C
x (1 + α
cu
x ΔT) Ω where α
cu
= 0.00393
KTY sensors can be used for motor protection (
parameter 1-97 KTY Threshold level
). FC 301 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
.
AU275636650261en-000101 / 130R0334
108 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide
Summary of Contents for VLT AutomationDrive FC 301
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