Danfoss VLT AutomationDrive FC 301 Programming Manual page 62

Parameter Descriptions
3.3.13.2 KTY Sensor Connection
NOTICE
(FC 302 only).
3 3
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 cu
KTY sensors can be used for motor protecting
(parameter 1-97 KTY Threshold level).
FC 302 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
Illustration 3.15 KTY Type Selection
KTY Sensor 1: 1 kΩ at 100 °C (for example Philips KTY
84-1)
KTY Sensor 2: 1 kΩ at 25 °C (for example Philips KTY 83-1)
KTY Sensor 3: 2 kΩ at 25 °C (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.
60
where
x ΔT) Ω α = 0 . 00393
cu
0 25 50 75 100
Temperature [°C]
KTY type 1 KTY type 2
Danfoss A/S © 02/2016 All rights reserved.
®
VLT AutomationDrive FC 301/302
3.3.13.3 ETR
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
2000
1000
600
500
400
300
200
100
60
50
40
30
20
10
Illustration 3.16 ETR Profile
3.3.13.4 ATEX ETR
®
The VLT
approved monitoring of motor temperature. Alternatively,
an external ATEX-approved PTC protection device can be
used.
NOTICE
Only use ATEX Ex-e-approved motors for this function.
See motor nameplate, approval certificate, datasheet, or
contact motor supplier.
When controlling an Ex-e motor with increased safety, it is
125 150
important to ensure certain limitations. The parameters
that must be programmed are presented in the following
KTY type 3
application example.
t [s]
1.0 1.2 1.4 1.6 1.8 2.0
PTC Thermistor Card MCB 112 offers ATEX-
f OUT = 1 x f M,N (par. 1-23)
f OUT = 2 x f M,N
f OUT = 0. 2 x f M,N
I
M
I (par. 1-24)
MN
MG33ML02