WEG CFW-09 - Page 131

132
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
Speed
P141
Time
P140
Figure 6.10
- Curve for high torque starts
P142
(1)
0.0 to 100.0
Maximum Output
[ 100.0 ]
Voltage
0.1 %
P143
(1)
0.0 to 100.0
IntermediateOutput
[ 50.0 ]
Voltage
0.1 %
P144
(1)
0.0 to 100.0
Output Voltage
[ 8.0 ]
at 3 Hz
0.1 %
P145
(1)
P133(> 90) to P134
Field Weakening
[ 1800 ]
Speed
1 rpm
P146
(1)
90 to P145
IntermediateSpeed
[ 900 ]
1 rpm
These parameters allow changing the standard V/F curves defined at
P202. Special V/F profiles may be necessary when motors with non-
standardvoltages/frequencies are used.
This function allows changing the predefined standard curves, which
represents the relationship between the output voltage and the output
frequency of the inverters and consequently, the motor magnetization
flux. This feature may be useful with special applications that require
ratedvoltagevaluesorratedfrequencyvalues differentfrom the standard
ones.
Function activated by setting P202 = 2 (V/F Adjustable).
The factorydefault 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
P144 is given by
P144 =
3
x P142
P403
These para-
meters are shown
on the
display(s)
only when
P202 = 2
(
Adjustable
V/F
Control)
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.Setdisplaydatain P001and P002(P208,P210,P207,P216andP217);
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).