Danfoss VLT Micro Drive FC 51 Series Programming Manual page 22

VLT Micro Drive FC 51
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:
* No Protection
[0]
[1] Thermistor Warning
[2] Thermistor Trip
[3] ETR Warning
[4] ETR Trip
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:
None
*
[0]
[1] Analog Input 53
[6] Digital input 29
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*.
Disables temperature monitoring.
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)
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,
If calculated upper limit of motor temperature range is exceeded, a warning occurs.
If 90% of calculated upper limit of motor temperature range is exceeded, an alarm occurs and frequency con-
verter trips.
Function:
Select the thermistor input terminal.
No thermistor is connected.
Connect thermistor to analog input terminal 53.
NB!
Analog input 53 cannot be selected for other purposes when selected as thermistor resource.
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,
Input 29 . The value of par. 5-13 remains however unchanged in parameter database while function is inactive.
Input Digital/
Analog
Digital 10 V
Analog 10 V
MG.02.C4.02 - VLT is a registered Danfoss trademark
4. Parameter Descriptions
.
Thermistor Resource
Supply Voltage Threshold Cut-out
Values
<800 ohm - >2.9k ohm
<800 ohm - >2.9k ohm
4
.
Digital
21