Danfoss VLT AutomationDrive FC 300 Series Programming Manual page 49

Parameter Descriptions
FC 302 can handle three types of KTY sensors, defined in
1-95 KTY Sensor Type. The actual sensor temperature can be
read out from 16-19 KTY sensor temperature.
4500
3 3
4000
3500
3000
2500
2000
1500
1000
500
0
-25
Illustration 3.15 KTY Type Selection
KTY Sensor 1: 1 kΩ at 100 °C (e.g. Philips KTY 84-1)
KTY Sensor 2: 1 kΩ at 25 °C (e.g. Philips KTY 83-1)
KTY Sensor 3: 2 kΩ at 25 °C (e.g. Infineon KTY-10
NOTE
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.
48
VLT
0 25 50 75 100
Temperature [°C]
KTY type 1 KTY type 2
MG33ME02 - VLT
®
AutomationDrive Programmming Guide
3.3.10.3 ETR
The calculations estimate the need for a lower load at
lower speed due to less cooling from the fan incorporated
in the motor.
t [s]
2000
1000
600
500
400
300
200
100
60
50
40
30
20
10
125 150
Illustration 3.16 ETR Profile
KTY type 3
3.3.10.4 ATEX ETR
The B-option MCB 112 PTC Thermistor option offers ATEX
approved monitoring of motor temperature. Alternatively,
an external ATEX approved PTC protection device can be
used.
NOTE
Only ATEX Ex-e approved motors may be used for this
function. See motor nameplate, approval certificate, data
sheet or contact motor supplier.
When controlling an Ex-e motor with "Increased Safety", it
is important to ensure certain limitations. The parameters
that must be programmed are presented in the following
application example.
Function
1-90 Motor Thermal
Protection
1-94 ATEX ETR cur.lim. speed
reduction
1-98 ATEX ETR interpol.
points freq.
1-99 ATEX ETR interpol
points current
1-23 Motor Frequency
4-19 Max Output Frequency
4-18 Current Limit
®
is a registered Danfoss trademark
1.0 1.2 1.4 1.6 1.8 2.0
Setting
[20] ATEX ETR
20%
Motor name plate
Enter the same value as for
4-19 Max Output Frequency
Motor name plate, possibly
reduced for long motor cables,
sinus filter or reduced supply
voltage
Forced to 150% by 1-90 [20]
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