Mitsubishi Electric FR-A700 Technical Manual page 225

(1) Conditions of Advanced magnetic flux
vector control selection
Advanced magnetic flux vector control may only be
utilized effectively when all of the following conditions
are satisfied.
If any of the conditions cannot be satisfied, torque
shortage, speed fluctuation or another fault may
occur. Operate under V/F control in that case.
The motor capacity should be equal to or one rank
lower than the inverter capacity.
Note that the motor capacity should be 0.4kW or
more for , 0.1kW or more for
A700
The motor type is the Mitsubishi standard motor,
high efficiency motor (SF-JR, SF-HR 0.2kW or
more) or Mitsubishi constant torque motor (SF-
JRCA 4 poles, SF-HRCA 0.4kW to 55kW). When
any other motor (other manufacturer standard
motor, other manufacturer's constant torque motor)
is used, perform offline auto tuning (refer to page
268) without fail.
Single-motor operation (one motor run by one
inverter) should be performed.
The wiring length from inverter to motor should be
within 30m. If the length is over 30m, perform
offline auto tuning with the cables wired.
For 75K or more, do not use an option sine wave
filter (MT-BSL/BSC) between the inverter and motor.
(2) Selection method of Advanced magnetic
flux vector control
Advanced magnetic flux vector control is selected by
simply setting any value other than 9999 in [Pr. 80
Motor capacity] and [Pr. 81 Number of motor poles]
when [Pr. 800 = 20] (initial value). V/F control is
chosen when either of the [Pr. 80] or [Pr. 81] setting is
9999.
When [Pr. 81 = 12, 14, 16, 18, 20] in
control and Advanced magnetic flux vector control
can be switched by turning X18 signal ON/OFF.
When Advanced magnetic vector control is set in
, V/F control and Advanced magnetic vector
E700
control can be switched by turning X18 signal ON/
OFF regardless of [Pr. 81] setting.
Set [Pr. 71] depending on the motor.
(3) Instructions on Advanced magnetic flux
.
E700
(4) Fine adjustment method for Advanced
, V/F
A700
259
vector control
A little inferior to V/F control in suppressing rotation
ripple.
There is an arithmetic operation delay of 0.1 to 0.2s
at start-up.
When a surge voltage suppression filter (FR-ASF-
H) is connected between the inverter 55K or less
and motor, output torque may decrease.
Applications suitable for Advanced magnetic flux
vector control
• Machines requiring a large starting torque
• Machines requiring a sufficient low-speed
torque
• Machines with load which varies greatly
Applications unsuitable for Advanced magnetic flux
vector control
• Grinders, lapping
machines for which speed fluctuation at low
speed is important.
magnetic flux vector control
The motor speed fluctuation at load fluctuation can
be adjusted using [Pr. 89].
When you have changed the conventional model FR-
A500(L) series for the FR-A700 series, Advanced
magnetic flux vector control is effective when motor
speed does not match.
Adjust using [Pr. 89]
PARAMETER
machines and other
Speed N
2