Adjustable 5 Points V/F (Pr. 71, Pr. 100 Bis Pr. 109) - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.9.4

Adjustable 5 points V/f (Pr. 71, Pr. 100 bis Pr. 109)

A dedicated V/f pattern can be made by freely setting the V/f characteristic between a start-up
and the base frequency and base voltage under V/f control (frequency voltage/frequency).
The torque pattern that is optimum for the machine's characteristic can be set.
Pr.
Name
No.
71
Applied motor
100
V/f1 (first frequency)
101
V/f1 (first frequency voltage)
102
V/f2 (second frequency)
103
V/f2 (second frequency voltage)
104
V/f3 (third frequency)
105
V/f3 (third frequency voltage)
106
V/f4 (fourth frequency)
107
V/f4 (fourth frequency voltage)
108
V/f5 (fifth frequency)
109
V/f5 (fifth frequency voltage)
Any V/f characteristic can be provided by presetting the parameters of V/f1 (first frequency volt-
age/first frequency) to V/f5.
Base frequency voltage
Fig. 6-64: V/f characteristic
For a machine of large static friction coefficient and small dynamic static friction coefficient, for
example, set a V/f pattern that will increase the voltage only in a low-speed range since such a
machine requires large torque at a start.
FR-A700 EC
Initial
Setting Range Description
Value
0–8/13–18/
Set "2" for adjustable 5 points V/f
20/23/24/30/
0
33/34/40/43/
control.
44/50/53/54
9999 0–400Hz/9999
0V 0–1000V/9999
9999 0–400Hz/9999
0V 0–1000V/9999
9999 0–400Hz/9999
Set each points (frequency, volt-
age) of V/f pattern.
9999: No V/f setting
0V 0–1000V/9999
9999 0–400Hz/9999
0V 0–1000V/9999
9999 0–400Hz/9999
0V 0–1000V/9999
Voltage
Pr. 19
V/f1
Torque boost
Pr. 0
V/f5
V/f4
V/f3
V/f2
Base frequency Pr. 3
Set V/f pattern
V/F V/F V/F
Refer to
Parameters referred to
Section
3 Base frequency 6.9.1
19 Base frequency 6.9.1
voltage
12 DC injection brake 6.13.1
operation voltage
113 Third V/f (base 6.9.1
frequency)
47 Second V/f 6.9.1
(base frequency)
60 Energy saving 6.18.1
control selection
71 Applied motor 6.12.2
Advanced mag- 6.2.2
netic flux vector
control
Real sensorless 6.2.2
vector control
Frequency
I001126E
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