Mitsubishi Electric FR-F800 Series Instruction Manual page 559

5.13.6 Adjustable 5 points V/F
V/F V/F 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.
The optimal V/F pattern matching the torque characteristics of the facility can be set.
Pr.
71
Applied motor
C100
100
V/F1 (first frequency)
G040
101 V/F1 (first frequency
G041 voltage)
102 V/F2 (second
G042 frequency)
103 V/F2 (second frequency
G043 voltage)
104
V/F3 (third frequency)
G044
105 V/F3 (third frequency
G045 voltage)
106
V/F4 (fourth frequency)
G046
107 V/F4 (fourth frequency
G047 voltage)
108
V/F5 (fifth frequency)
G048
109 V/F5 (fifth frequency
G049 voltage)
• 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.
• Setting procedure
1.
Set the rated motor voltage in Pr.19 Base frequency voltage.
(No function at the setting of "9999" or "8888".)
2.
Set Pr.71 Applied motor = "2" (adjustable 5 points V/F).
3.
Set frequency and voltage to be set in Pr.100 to Pr.109.
CAUTION
• Make sure to set the parameters correctly according to the motor used. Incorrect setting may cause the motor to overheat
and burn.
558
5. PARAMETERS
5.13 (G) Control parameters
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Name Initial value
0
9999
0 V
9999
0 V
9999
0 V
9999
0 V
9999
0 V
Voltage
Base
frequency
voltage
Pr.19
Torque
boost
Pr.0
0
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Setting range
Standard motor (such as SF-JR)
2
Adjustable 5 points V/F
Others Refer to
0 to 590 Hz, 9999
0 to 1000 V
0 to 590 Hz, 9999
0 to 1000 V
0 to 590 Hz, 9999
Set each point of the V/F pattern (frequency, voltage).
9999: Do not set V/F.
0 to 1000 V
0 to 590 Hz, 9999
0 to 1000 V
0 to 590 Hz, 9999
0 to 1000 V
V/F5
V/F4
V/F3
V/F1
V/F2
Frequency
Base
V/F Characteristic
frequency
Pr.3
Description
page 379.