Danfoss VLT Micro Drive FC 51 Series Programming Guide

4.2.7. 1-9* Motor Temperature
With an estimated motor temperature monitor the frequency converter is able to estimate motor temperature without having a thermistor mounted. It
is thus possible to receive a warning or an alarm, if motor temperature exceeds upper operational limit.
1-90 Motor Thermal Protection
Option: Function:
Using ETR (Electronic Terminal Relay) the motor temperature is calculated based on frequency, speed and time.
Danfoss recommends using The ETR function, if a thermistor is not present.
NB!
ETR calculation is based on motor data from group 1-2*.
[0] *
No Protection Disables temperature monitoring.
[1] Thermistor Warning A thermistor connected to either digital or analog input gives a warning if upper limit of motor temperature
range is exceeded, (see par. 1-93,
Thermistor Resource) .
[2] Thermistor Trip A thermistor connected to either digital or analog input gives an alarm and makes the frequency converter trip
if upper limit of motor temperature range is exceeded, (see par. 1-93,
Thermistor Resource .
[3] ETR Warning If calculated upper limit of motor temperature range is exceeded, a warning occurs.
[4] ETR Trip If 90% of calculated upper limit of motor temperature range is exceeded, an alarm occurs and frequency con-
verter trips.
NB!
When the ETR function has been selected the drive will store the recorded temperature at power down and this temperature will resume
at power up regardless of the elapsed time. Changing par. 1-90 back to [0] No Protection will reset the recorded temperature.
1-93 Thermistor Resource
Option: Function:
Select the thermistor input terminal.
[0]
*
None No thermistor is connected.
[1] Analog Input 53 Connect thermistor to analog input terminal 53.
NB!
Analog input 53 cannot be selected for other purposes when selected as thermistor resource.
[6] Digital input 29 Connect thermistor to digital input terminal 29.
While this input functions as thermistor input, it will not respond to the function chosen in par. 5-13,
Digital
Input 29
. The value of par. 5-13 remains however unchanged in parameter database while function is inactive.
Input Digital/
Analog
Supply Voltage Threshold Cut-out
Values
Digital 10 V <800 ohm - >2.9k ohm
Analog 10 V <800 ohm - >2.9k ohm
VLT
p
Micro Drive FC 51 4. Parameter Descriptions
MG.02.C4.02 - VLT
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is a registered Danfoss trademark 21
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Danfoss VLT Micro Drive FC 51 Series Specifications

General

Brand	Danfoss
Model	VLT Micro Drive FC 51 Series
Category	Media Converter
Language	English