Danfoss VLT AQUA Drive FC 202 Programming Guide

1-90 Motor Thermal Protection
Option: Function:
[2] Thermistor
trip
Stops (trips) the frequency converter when the
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
warning 1
Calculates the load when set-up 1 is active
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%.
3.3.15 PTC Thermistor Connection
1330
550
250
-20 °C
175HA183.11
4000
3000
R
(Ω)
 nominal
 nominal -5 °C  nominal +5 °C
 [°C]
Illustration 3.12 PTC Prole
Using a digital input and 10 V as supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
•
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip.
•
Set parameter 1-93 Thermistor Source to [6] Digital
Input.
PTC / Thermistor
R
OFF
ON
<800 Ω
+10V
130BA152.10
>2.7 kΩ
12 13 18 37322719 29 33 20
5550
39 42 53 54
Illustration 3.13 PTC Thermistor Connection - Digital Input
Parameter Description Programming Guide
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Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English