Danfoss VLT AQUA Drive FC 202 Programming Manual page 61

Parameter Description
1-90 Motor Thermal Protection
Option: Function:
[2] Thermistor Stops (trips) the frequency converter when the
trip connected thermistor or KTY sensor in the
motor reacts if motor overtemperature occurs.
The thermistor cutout value must be more
than 3 kΩ.
Integrate a thermistor (PTC sensor) in the
motor for winding protection.
[3] ETR Calculates the load when set-up 1 is active
warning 1 and activates a warning on the display when
the motor is overloaded. Program a warning
signal via 1 of the digital outputs.
[4] ETR trip 1 Calculates the load when set-up 1 is active
and stops (trips) the frequency converter
when the motor is overloaded. Program a
warning signal via 1 of the digital outputs. The
signal appears if there is a warning and if the
frequency converter trips (thermal warning).
[5] ETR
warning 2
[6] ETR trip 2
[7] ETR
warning 3
[8] ETR trip 3
[9] ETR
warning 4
[10] ETR trip 4
[20] ATEX ETR Activates the thermal monitoring function for
Ex-e motors for ATEX. Enables
parameter 1-94 ATEX ETR cur.lim. speed
reduction, parameter 1-98 ATEX ETR interpol.
points freq., and parameter 1-99 ATEX ETR
interpol points current.
NOTICE
If [20] ATEX ETR is selected, follow the instructions in the
dedicated chapter of the design guide and the
instructions provided by the motor manufacturer.
NOTICE
If [20] ATEX ETR is selected, set parameter 4-18 Current
Limit to 150%.
MG20OB02
Programming Guide
3.3.15 PTC Thermistor Connection
R
(Ω)
4000
3000
1330
550
250
-20 °C
Illustration 3.12 PTC Profile
Using a digital input and 10 V as supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
•
•
39 42 50
12 13 18
PTC / Thermistor
Illustration 3.13 PTC Thermistor Connection - Digital Input
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 nominal -5 °C
 nominal
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip.
Set parameter 1-93 Thermistor Source to [6] Digital
Input.
53 54 55
OFF
19 27 29 32 33 20 37
ON
<800 Ω
3
 [°C]
 nominal +5 °C
R
>2.7 kΩ
59
3