Mitsubishi Electric 800 Series Instruction Manual page 545

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.
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 voltage)
G041
102 V/F2 (second frequency)
G042
103 V/F2 (second frequency voltage)
G043
104 V/F3 (third frequency)
G044
105 V/F3 (third frequency voltage)
G045
106 V/F4 (fourth frequency)
G046
107 V/F4 (fourth frequency voltage)
G047
108 V/F5 (fifth frequency)
G048
109 V/F5 (fifth frequency voltage)
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.
• 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 this parameter correctly according to the motor used. Incorrect setting may cause the motor to overheat and burn.
544
5. PARAMETERS
5.13 (G) Control parameters
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
V/F1
boost
Pr.0
0
V/F Characteristic
Setting range
2 Standard motor
Adjustable 5 points V/F
Others Refer to
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
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/F2
Frequency
Base
frequency
Pr.3
Description
page 351.