Danfoss VLT FC 102 Operating Instructions Manual page 97

VLT HVAC Low Harmonic Drive Operating In-
structions
[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.
In order to maintain PELV, all connections made to the control terminals must be PELV, e.g. thermistor must be reinforced/ double
insulated
NB!
Danfoss recommends using 24 VDC as thermistor supply voltage.
1-93 Thermistor Source
Option:
[0] * None
[1] Analog input 53
[2] Analog input 54
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.
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
Reference 1 Source , par. 3-16 Reference 2 Source or par. 3-17 Reference 3 Source ).
par. 3-15
None must always be selected.
When using MCB112, choice [0]
®
MG.16.A1.02 - VLT is a registered Danfoss trademark
6 How to Programme the Low Harmonic Drive
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