544
5. PARAMETERS
5.13 (G) Control parameters
5.13.6 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.
• 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.
Pr. Name Initial value Setting range Description
71
C100
Applied motor 0 2 Standard motor
Adjustable 5 points V/F
Others Refer to page 351.
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
CAUTION
• Make sure to set this parameter correctly according to the motor used. Incorrect setting may cause the motor to overheat and burn.
Base
frequency
voltage
Pr.19
Base
frequency
Pr.3
Torque
boost
Pr.0
V/F Characteristic
0
V/F5
V/F4
V/F3
V/F2
V/F1
Frequency
Voltage
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