Adjustable 5 Points V/F - Mitsubishi Electric FR-A820-00046 Instruction Manual

(G) Control parameters
5.16.5

Adjustable 5 points V/F

By setting a desired V/F characteristic from the start up to the base frequency or base voltage with the
V/F control (frequency voltage/frequency), a dedicated V/F pattern can be generated.
Optimal V/F pattern matching the torque characteristics of the facility can be set.
Pr.
71
C100
100
G040
101
G041
102
G042
103
G043
104
G044
105
G045
106
G046
107
G047
108
G048
109
G049
● By setting the V/F1 (first frequency voltage/first frequency) to V/F5 parameters in advance, a
desired V/F characteristic can be obtained.
● For an example, with the equipment with large static friction factor and small dynamic friction
factor, large torque is required only at the start up, so a V/F pattern that will raise the voltage only
at the low-speed range is set.
Fig. 5-345:
5 - 698
V/F V/F V/F
Name
Applied motor
V/F1(first frequency)
V/F1(first frequency voltage)
V/F2(second frequency)
V/F2(second frequency voltage)
V/F3(third frequency)
V/F3(third frequency voltage)
V/F4(fourth frequency)
V/F4(fourth frequency voltage)
V/F5(fifth frequency)
V/F5(fifth frequency voltage)
Voltage
Base
frequency
voltage
Pr. 19
Torque
boost
Pr. 0
V/F characteristic
Initial
Setting range Description
value
2
0
Others
0 to 590 Hz,
9999
9999
0 V 0 to 1000 V
0 to 590 Hz,
9999
9999
0 V 0 to 1000 V
0 to 590 Hz,
9999
9999
0 V 0 to 1000 V
0 to 590 Hz,
9999
9999
0 V 0 to 1000 V
0 to 590 Hz,
9999
9999
0 V 0 to 1000 V
V/F5
V/F4
V/F3
V/F1
V/F2
Base
0
V/F Characteristic
frequency
Pr. 3
Standard motor (such as SF-JR)
Adjustable 5 points V/F
Refer to page 5-451.
Set each point of the V/F pattern
(frequency, voltage).
9999: Do not set V/F
Frequency
Parameters
I002752E