Motor Temperature; Trip Speed Low [Hz]; Motor Thermal Protection - Danfoss VLT Programming Manual

®
VLT HVAC Drive Programming Guide

1-87 Trip Speed Low [Hz]

Range:
0.0 Hz* [Application dependant]
NB!
This parameter is only available if par. 0-02

3.3.9 1-9* Motor Temperature

Parameters for setting the temperature protection features for the motor.

1-90 Motor Thermal Protection

Option:
[0] * No protection
[1] Thermistor warning
[2] Thermistor trip
[3] ETR warning 1
[4] * ETR trip 1
[5] ETR warning 2
[6] ETR trip 2
[7] ETR warning 3
[8] ETR trip 3
[9] ETR warning 4
[10] ETR trip 4
ETR (Electronic Thermal Relay) functions 1-4 will calculate the load when set-up where they were selected is active. For example ETR-3 starts calculating
when set-up 3 is selected. For the North American market: The ETR functions provide class 20 motor overload protection in accordance with NEC.
Function:
If the Trip Speed is set to 0, the function is not active.
If the speed at any time after the start (or during a stop) falls below the value in the parameter,
the drive will trip with an alarm [A49] Speed Limit. Function at stop.
Motor Speed Unit is set to [Hz].
Function:
The frequency converter determines the motor temperature for motor protection in two different
ways:
• Via a thermistor sensor connected to one of the analog or digital inputs (par. 1-93
mistor Source ).
• Via calculation (ETR = Electronic Thermal Relay) of the thermal load, based on the actual
load and time. The calculated thermal load is compared with the rated motor current
I and the rated motor frequency f
M,N
load at lower speed due to less cooling from the fan incorporated in the motor.
If the motor is continuously overloaded and no warning or trip of frequency converter is wanted.
Activates a warning when the connected thermistor in the motor reacts in the event of motor over-
temperature.
Stops (trips) the frequency converter when the connected thermistor in the motor reacts in the
event of motor over-temperature.
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
3 Parameter Description
. The calculations estimate the need for a lower
M,N
3
Ther-
57