YASKAWA GA700 Technical Manual page 30

1.3 Features and Advantages of Control Methods
PM Open Loop
Control
Vector Control
Method
Selection
(OLV/PM)
Controlled
Motor
Speed Search
Yes
*5
Automatic
Energy-saving No
Control
*5
High Slip
No (induction motor-
Braking
specific function)
(HSB)
Feed Forward
No
Control
*5
KEB Ride-
Yes
Thru Function
*5
Overexcitation No (induction motor-
Deceleration specific function)
Overvoltage
Suppression Yes
Function
*5 *7
Sensorless
Zero Speed No
Control
*5
Enabled when n8-57 = 1 [HFI Overlap Selection = Enabled].
*1
*2 Rotational Auto-Tuning is necessary.
*3 Contact Yaskawa or your nearest sales representative to drive non-Yaskawa PM motors (SSR1 and SST4 series standard
specifications).
*4 Select the drive capacity accordingly.
*5 Note these points when you use this function:
• When you can decouple the motor and machine for a test run, use Rotational Auto-Tuning. You must make adjustments to the
control in the range where there is no vibration in the machine after Rotational Auto-Tuning.
• For vector control, use a 1:1 drive to motor ratio. You cannot use vector control when more than one motor is connected to one
drive. Select a drive capacity so that the motor rated current is 50% to 100% of the drive rated current. If the carrier frequency is
too high, the drive rated current is derated.
*6 Torque control at zero speed is only available with IPM motors. To enable torque control with IPM motors at zero speed, set n8-57 =
1.
*7 Do not use this function with hoist application.
30
PM Advanced
PM Closed Loop
Open Loop Vector
Vector Control
Control
(CLV/PM)
(AOLV/PM)
PM Motor
Yes Yes
Yes (IPM motors Yes (IPM motors
only) only)
No (induction motor- No (induction motor-
specific function) specific function)
Yes Yes
Yes Yes
No (induction motor- No (induction motor-
specific function) specific function)
Yes Yes
Yes (IPM motors
-
only)
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
EZ Open Loop
Vector Control
(EZOLV)
Induction Motors/
PM Motors/SynRM
(Synchronous
Reluctance
Motors)
Immediately estimates (or
Yes (Although NOT detects) motor speed and
operation in the direction when coasting to
reverse direction of a stop to quickly start-up
the Run command) the drive without stopping
the motor.
Automatically adjusts the
voltage applied to motors
Yes
to maximize motor
efficiency for all load sizes.
Increases motor loss to let
the motor decelerate faster
than usual without a
No
braking resistor. Motor
characteristics have an
effect on this function.
Compensates effects of the
system inertia to increase
No
the speed precision when
the load changes.
Quickly and safely stops
the motor during power
loss and automatically
Yes starts operation at the
previous speed when
restores power without
coasting the motor.
Sets the V/f higher than the
setting value during
No deceleration to increase
motor loss and decrease
deceleration time.
Adjusts speed during
Yes regeneration to prevent
overvoltage.
Enabled with high
No frequency injection with
IPM motors.
Notes
-