User`s guide

98
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
To set the parameter P138 use the following procedure:
-
Run the motor without load up to approximatelyhalf of
the application top speed.
-
Measure the actual motor or equipment speed.
-
Apply rated load to equipment.
-
I
ncr
ease parameter
P138
until the speed reaches its
no-load speed.
P142
(2) (3)
0 to 100
MaximumOutput
[ 100 % ]
Voltage
1 %
P145
(2) (3)
P133 to P134
Field Weakening
[ 50.00 Hz or
Frequency
60.00 Hz
(F
nom
)
depending on
the market ]
0.01Hz
(

99.99Hz);
0.1 Hz
(

100.0 Hz)
Define the V/F curve used in V/F control (P202 = 0 or 1).
These parameters allow changing the standard V/F cur-
ve defined at P202 - Control Mode.
P142sets the maximumoutput voltage. This value is set
as a percent of the inverter supply voltage.
Parameter P145 defines the rated frequency of the mo-
tor used.
The V/F curve relates the inverter output voltage and
frequency (applied to the motor) and consequently the
magnetizingflux of the motor.
The programmable V/F curve can be used in special
applications where the motors used require a rated
voltage and/or frequency
different than the standard
ones. Examples: motor for 220 V/400 Hz and a motor for
200 V/60 Hz.
Parameter P142 is also useful in appplications that
require motor rated voltage different from the inverter
supply voltage. Example: 440 V line and 380 V motor.
Figure 6.10 -
V/F curve with slip compensation
OutputVoltage
(function of
the motor
load)
Output
Frequency