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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.
NOTE!
Danfoss recommends using 24 VDC as thermistor supply voltage.
1-93 Thermistor Source
Option:
Function:
Select the input to which the thermistor (PTC sensor) should be connected. An analog input option
[1] or [2] cannot be selected if the analog input is already in use as a reference source (selected in
par. 3-15
or par. 3-17
Reference 3 Source
).
When using MCB112, choice [0]
None
must always be selected.
7 How to Program the Adjustable Frequency
Drive
VLT
®
HVAC Drive Instruction Manual
7-18
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
7