Danfoss VLT AutomationDrive FC 301 Programming Manual page 75

Parameter Descriptions
1-90 Motor Thermal Protection
Option: Function:
frequency converter when the
motor is overloaded. Program a
warning signal via 1 of the digital
outputs. The signal appears in the
event of 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.
[21] Advanced ETR
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%.
M0013101
Programming Guide
3.2.13 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
Using an analog input and 10 V as supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
•
•
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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
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip.
Set parameter 1-93 Thermistor Source to [2] Analog
Input 54.
3
 [°C]
 nominal +5 °C
R
>2.7 kΩ
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