MG.20.B6.02 – VLT is a registered Danfoss trademark
VLT
®
2000 Series
64
109 Start voltage
(START VOLTAGE)
Value: (automatically set)
0 - (U
M,N
+ 10%)
Function:
By increasing the start voltage you can achieve higher
starting torque. Small motors (< 1.0 kW) usually
require high start voltage. On parallel coupling of mo-
tors, only the start voltage can be used to increase
the starting torque.
Description:
Do not forget to consider that the motor must be able
to start with the required torque:
1. Choose a value to make start possible with the load
in question.
2. Reduce value until start with the load in question
is just possible.
3. Choose a value where operation in the rest of the
frequency range is possible at the lowest possible
current consumption.
If the start voltage makes normal operation impossible,
you can change the U/f ratio in parameter 111.
Warning: If the use of start voltage is over-
done it can lead to magnetic saturation and
motor overheating and the frequency converter may trip
out. Therefore take care when using the start voltage
parameter.
105 Motor frequency
(MOTOR FREQ)
Value:
✭
50 Hz (50 Hz)
[0]
60 Hz (60 Hz)
[1]
87 Hz (87 Hz)
[2]
100 Hz (100 Hz)
[3]
Function:
Using this parameter you can select the frequency
equivalent to the motor’s rated frequency.
Description:
You can choose among 4 different frequency values.
The value is selected on the basis of the data on the
type plate of the motor.
The U/f ratio in parameter 111 is changed automatically.
107 Motor current
(MOTOR CURRENT)
Value:
I
MAG (par.108)
- I
VLT,MAX(
PAR
. 209)
Function:
The motor’s rated current is included in the VLT
frequency converter’s calculation of e.g. torque,
thermal motor protection and cut-out level.
Description:
You must record the rated motor current (Amp). The
value will appear from the motor plate.
108 Motor magnetising current
(MOTOR MAG.AMP)
Value:(automatically set)
0.3 - I
M,N (par.107)
Function:
The VLT frequency converter uses the value for
different calculations such as compensation.
Description:
If the factory setting is unsuitable the motor current
on running idle should be measured with a suitable
amperemeter (RMS). The magnetising current is then
set to the measured value.
✭
= Factory setting. Text in ( ) = Display text. The figures in [ ] are used in bus communication.
Description of parameters
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