Danfoss VLT HVAC Operating Instructions Manual page 69

®
VLT HVAC Drive Operating Instructions
windings; mechanical thermal switch (Klixon
type); or Electronic Thermal Relay (ETR).
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when
the motor temperature is too high.
Parameter set-up:
Set Par. 1-90
Thermistor Trip
Set Par. 1-93
put
[6]
Using a digital input and 10 V as power supply:
Example: The frequency converter trips when
the motor temperature is too high.
Parameter set-up:
Set Par. 1-90
Thermistor Trip
Set Par. 1-93
put 33
Using an analog input and 10 V as power sup-
ply:
Example: The frequency converter trips when
the motor temperature is too high.
Parameter set-up:
Set Par. 1-90
Thermistor Trip
Set Par. 1-93
put 54
Do not select a reference source.
Motor Thermal Protection
[2]
Thermistor Source Digital In-
to
Motor Thermal Protection
[2]
Thermistor Source to Digital In-
[6]
Motor Thermal Protection
[2]
Thermistor Source Analog In-
to
[2]
MG.11.A4.02 - 09.10.06. VLT
6. How to programme the frequency converter
to
Input Supply
Digital/an- Voltage
alog Volt
Digital 24 V
Digital 10 V
Analog 10 V
NB!
Check that the chosen supply
voltage follows the specification
of the used thermistor element.
ETR Warning 1-4
Select
on the display when the motor is overloaded.
ETR Trip 1-4
Select
verter when the motor is overloaded.
to
Programme a warning signal via one of the
digital outputs. The signal appears in the
event of a warning and if the frequency con-
verter trips (thermal warning).
ETR (Electronic Thermal Relay) functions 1-4
will calculate the load when the set-up where
they were selected is active. For example ETR
starts calculating when setup 3 is selected. For
the North American market: The ETR func-
tions provide class 20 motor overload protec-
tion in accordance with NEC.
to
1-93 Thermistor Source
Value:
None
Analog input 53
Analog input 54
® is a registered Danfoss trademark
Threshold
Cut-out Values
< 6.6 kΩ - > 10.8 kΩ
< 800Ω - > 2.7 kΩ
< 3.0 kΩ - > 3.0 kΩ
, to activate a warning
to trip the frequency con-
[0]
[1]
[2]
6
69