Mitsubishi Electric FR-A800, Instruction Manual

Page: 840 / 1042

(G) Control parameters Parameters
5 - 660
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.
●
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.
Pr. Name
Initial
value
Setting range Description
71
C100
Applied motor 0
2
Standard motor (such as SF-JR)
Adjustable 5 points V/F
Others Refer to page 5-434.
100
G040
V/F1(first frequency) 9999
0 to 590 Hz,
9999
Set each point of the V/F pattern
(frequency, voltage).
9999: Do not set V/F
101
G041
V/F1(first frequency voltage) 0 V 0 to 1000 V
102
G042
V/F2(second frequency) 9999
0 to 590 Hz,
9999
103
G043
V/F2(second frequency voltage) 0 V 0 to 1000 V
104
G044
V/F3(third frequency) 9999
0 to 590 Hz,
9999
105
G045
V/F3(third frequency voltage) 0 V 0 to 1000 V
106
G046
V/F4(fourth frequency) 9999
0 to 590 Hz,
9999
107
G047
V/F4(fourth frequency voltage) 0 V 0 to 1000 V
108
G048
V/F5(fifth frequency) 9999
0 to 590 Hz,
9999
109
G049
V/F5(fifth frequency voltage) 0 V 0 to 1000 V
I002752E
Fig. 5-327: V/F characteristic
V/F V/F V/F
0
V/F5
V/F4
V/F3
V/F2
V/F1
Voltage
Frequency
Base
frequency
Pr. 3
Torque
boost
Pr. 0
Base
frequency
voltage
Pr. 19
V/F Characteristic