Danfoss FC 300 Design Manual page 144

FC 300 Design Guide
Using an analog 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 Motor Thermal Protection to Ther-
mistor Trip [2]
Set Par. 1-93 Thermistor Source to Analog Input
54 [2]
Do not select a reference source.
Input Supply Volt-
Digital/ana- age
log 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.
Select ETR Warning 1-4, to activate a warning on
the display when the motor is overloaded.
Select ETR Trip 1-4 to trip the frequency converter
when the motor is overloaded.
Programme a warning signal via one of the digital
outputs. The signal appears in the event of a
warning and if the frequency converter trips (ther-
mal warning).
ETR ( Electronic Terminal 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
factory setting
144
How to Programme
Threshold
Cut-out Values
< 6.6 kΩ - > 10.8 kΩ
< 800Ω - > 2.7 kΩ
< 3.0 kΩ - > 3.0 kΩ
() display text [] value for use in communication via serial communication port
MG.33.B7.02 - VLT is a registered Danfoss trademark
American market: The ETR functions provide class
20 motor overload protection in accordance with
NEC.
1-91 Motor External Fan
Value:
No
Yes
Function:
Select No [0] if no external fan is required, i.e. the
motor is derated at low speed.
Select Yes [1] to apply an external motor fan (ex-
ternal ventilation), so no derating of the motor is
required at low speed. The graph below is followed
if the motor current is lower than nominal motor
current (see par. 1-24). If the motor current ex-
ceeds nominal current, the operation time still de-
creases as if no fan were installed.
This parameter cannot be adjusted while the mo-
tor is running.
1-93 Thermistor Source
Value:
None
Analog input 53
Analog input 54
Digital input 18
Digital input 19
Digital input 32
[0]
[1]
[0]
[1]
[2]
[3]
[4]
[5]