Danfoss VLT AutomationDrive FC 301 Programming Manual page 51

Parameter Descriptions
1-90 Motor Thermal Protection
Option: Function:
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 1-94 ATEX ETR
cur.lim. speed reduction, 1-98 ATEX ETR interpol.
points freq. and 1-99 ATEX ETR interpol points
current.
[21] Advanced
ETR
NOTICE
If [20] ATEX ETR is selected, follow strictly the instructions
described in the dedicated chapter of the VLT
AutomationDrive Design Guide and the instructions given
by the motor manufacturer.
NOTICE
If [20] ATEX ETR is selected, 4-18 Current
Limit must be set to 150%.
3.3.11.1 PTC Thermistor Connection
R
(Ω)
4000
3000
1330
550
250
 nominel -5°C
-20°C
Illustration 3.12 PTC Profile
®
VLT AutomationDrive FC 301/302 Programming Guide
®
 [°C]
 nominel +5°C
 nominel
MG33MH02 - Rev. 2013-09-30
Using a digital input and 10 V as power supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
Set 1-90 Motor Thermal Protection to [2] Thermistor Trip
Set 1-93 Thermistor Source to [6] Digital Input
39 42 50 53 54 55
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Illustration 3.13 PTC Thermistor Connection - Digital Input
Using an analog input and 10 V as power supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
Set 1-90 Motor Thermal Protection to [2] Thermistor Trip
Set 1-93 Thermistor Source to [2] Analog Input 54
39 42 50 53 54 55
PTC / Thermistor
Illustration 3.14 PTC Thermistor Connection - Analog Input
Input Supply voltage
Digital/analog
Digital 10 V
Analog 10 V
NOTICE
Check that the chosen supply voltage follows the
specification of the used thermistor element.
3.3.11.2 KTY Sensor Connection
(FC 302 only)
KTY sensors are used especially in Permanent Magnet
Servo Motors (PM motors) for dynamic adjusting of motor
parameters as stator resistance (1-30 Stator Resistance (Rs))
for PM motors and also rotor resistance (1-31 Rotor
OFF
ON
R
<800 Ω >2.7 kΩ
OFF
ON
<3.0 k Ω
R
>3.0 k Ω
Threshold
cut-out values
< 800 Ω - > 2.7 kΩ
< 3.0 kΩ - > 3.0 kΩ
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