Adjustable 5 Points V/F - Mitsubishi Electric FR-A800 Series Instruction Manual

NOTE
• In the energy saving operation mode, an energy saving effect is not expected for applications with high load torque or with the
equipment with frequent acceleration and deceleration.
• In the Optimum excitation control mode, an energy saving effect is not expected when the motor capacity is extremely small
compared with the inverter capacity or when multiple motors are connected to a single inverter.
• When the energy saving operation mode or Optimum excitation control mode is selected, the deceleration time may become
longer than the setting value. Also, it may cause overvoltage more often compared to constant-torque load characteristics, so
set the deceleration time longer.
• When the motor becomes unstable during the acceleration, set the acceleration time longer.
• Output current may increase slightly with the energy saving operation mode or the Optimum excitation control mode since the
output voltage is controlled.

5.16.6 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).
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Name Initial value
0
9999
0 V
9999
0 V
9999
0 V
9999
0 V
9999
0 V
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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
Description
page 528.
5. PARAMETERS
5.16 (G) Control parameters
1
2
3
4
5
6
7
8
9
10
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