3.3.9 1-9* Motor Temperature
Parameters for setting the temperature protection features for the motor.
1-90 Motor Thermal Protection
Option: Function:
The adjustable frequency drive determines the motor temperature for motor protection in two dif-
ferent ways:
• Via a thermistor sensor connected to one of the analog or digital inputs (par.1-93
Ther-
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
M,N
and the rated motor frequency f
M,N
. The calculations estimate the need for a lower
load at lower speed due to less cooling from the fan incorporated in the motor.
[0] No protection If the motor is continuously overloaded and no warning or trip of adjustable frequency drive is
wanted.
[1] Thermistor warning Activates a warning when the connected thermistor in the motor reacts in the event of motor over-
temperature.
[2] Thermistor trip Stops (trips) the adjustable frequency drive when the connected thermistor in the motor reacts in
the event of motor overtemperature.
[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 the 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.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
3-28
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3
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