Mitsubishi FR-A800

(G) Control parameters
PARAMETERS
603
5
GROUP
G
5.16.5 Adjustable 5 points V/F
NOTE
• Adjustable 5 points V/F will become enabled at the time of V/F control.
• At the time of Pr.19 Base frequency voltage ="8888, 9999", setting of Pr.71 = "2" cannot be made. When setting Pr.71 =
"2", set the rated motor voltage in Pr.19.
• Read only error ( ) is generated when the frequency value for each point is same.
• Set each point for Pr.100 to Pr.109 (frequency, voltage) within the range of Pr.3 Base frequency and Pr.19 Base frequency
voltage.
• When Pr.71 = "2", Pr.47 Second V/F (base frequency) and Pr.113 Third V/F (base frequency) will not function.
• When Pr.71 = "2", electronic thermal O/L relay will make calculations assuming a standard motor.
• By simultaneously using Pr.60 Energy saving control selection and the adjustable 5 points V/F, further energy saving effect
is expected.
• The Pr.0 Torque boost and Pr.12 DC injection brake operation voltage settings are automatically changed according to
the Pr.71 setting. (Refer to page 441)
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. 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 438.
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
• 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.
V/F
V/F
V/F
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