WEG CFW-09 User Manual page 131

CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
[Factory Setting]
Parameter
(1)
P142
Maximum Output
Voltage
(1)
P143
Intermediate Output
Voltage
(1)
P144
Output Voltage
at 3 Hz
P145 (1) P133(> 90) to P134
Field Weakening
Speed
(1)
P146
Intermediate Speed
These para-
meters are shown
on the display(s)
only when P202 = 2
(Adjustable V/F
Control)
132
Range
Unit Description / Notes
These parameters allow changing the standard V/F curves defined at
0.0 to 100.0
P202. Special V/F profiles may be necessary when motors with non-
[ 100.0 ]
standard voltages/frequencies are used.
0.1 %
This function allows changing the predefined standard curves, which
represents the relationship between the output voltage and the output
0.0 to 100.0
frequency of the inverters and consequently, the motor magnetization
[ 50.0 ]
flux. This feature may be useful with special applications that require
0.1 %
rated voltage values or rated frequency values different from the standard
ones.
0.0 to 100.0
Function activated by setting P202 = 2 (V/F Adjustable).
[ 8.0 ]
0.1 %
The factory default value of P144 (8.0 %) is defined for standard 60 Hz
motors. If the rated motor frequency (set at P403) is different from 60
Hz, the factory default value of P144 can become unsuitable and may
cause troubles during motor start. A good approach for the setting of
[ 1800 ]
P144 is given by
1 rpm
90 to P145
[ 900 ]
1 rpm
If an increase of the starting torque is required, increase the value of
P144 gradually.
Procedures for the parameter setting of the function "Adjustable V/F":
1.Disable Inverter;
2.Check inverter data (P295 to P297);
3.Set motor data (P400 to P406);
4.Set display data in P001 and P002 (P208, P210, P207, P216 andP217);
5.Set speed limits (P133 and P134);
6.Set parameters of the function "Adjustable V/F" (P142 to P146);
7.Enable function "Adjustable V/F" (P202 = 2).
Speed
P141
P140
Figure 6.10 - Curve for high torque starts
3
P144 =
P403
Time
x P142