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VLT® PTC Thermistor Card MCB 112
Operating Guide
Parameter 1-98
[0]=5 Hz
[1]=15 Hz
[2]=25 Hz
[3]=50 Hz
2.
Use the 4 current points [A] from the motor nameplate.
3.
Calculate the values as a percentage of nominal motor current and enter it into the array.
I
x 100
x
%
I
m, n
4.
Program all frequency/current limit points from the motor nameplate or motor data sheet.
5.
Enter frequency settings for parameter 1-98 ATEX ETR interpol. points freq. in Hz, not RPM.
4.3 Parameter Set-up
4.3.1 Alarm Handling
Ensure that the digital input set to [80] PTC Card 1 is not also connected as a thermistor resource (motor overload protection) in
parameter 1-93 Thermistor Resource.
Configure the digital input in parameter group 5-1* Digital Inputs.
Digital input function
No operation
Reset
...
PTC Card 1
...
All digital inputs can be set to [80] PTC Card 1. However, only 1 digital input can have this selection.
4.4 Parameter Set-up for Ex eb and Ex ec Motors
Do not use the ATEX ETR Monitor function with an Ex db motor by setting Parameter 1–90 Motor Thermal Protection to a different
value than [20] ATEX ETR. This automatically disables the ATEX ETR specific parameters from parameter 1–94 ATEX ETR cur.lim.
speed reduction to parameter 1-99 ATEX ETR interpol points current.
4.4.1 Overview of Ex eb and Ex ec Specific Parameters
Parameter
Parameter 1–90 Motor Thermal Protection
Parameter 1–94 ATEX ETR cur.lim. speed reduction
Parameter 1–98 ATEX ETR interpol. points freq.
20 | Danfoss A/S © 2022.08
Parameter 1-99
[0]=40%
[1]=80%
[2]=100%
[3]=100%
N O T I C E
Select
[0]
[1]
[80]
N O T I C E
Setting
[20] ATEX ETR
20%
Motor nameplate
Terminal
All terminals 32, 33
All
All
AQ267038105120en-000101 / 130R0104
Commissioning
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