1.3 Features and Advantages of Control Methods
30 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Control
Method
Selection
PM Open Loop
Vector Control
(OLV/PM)
PM Advanced
Open Loop Vector
Control
(AOLV/PM)
PM Closed Loop
Vector Control
(CLV/PM)
EZ Open Loop
Vector Control
(EZOLV)
Notes
Controlled
Motor
PM Motor
Induction Motors/
PM Motors/SynRM
(Synchronous
Reluctance
Motors)
-
Speed Search
*5
Yes Yes Yes
Yes (Although NOT
operation in the
reverse direction of
the Run command)
Immediately estimates (or
detects) motor speed and
direction when coasting to
a stop to quickly start-up
the drive without stopping
the motor.
Automatic
Energy-saving
Control
*5
No
Yes (IPM motors
only)
Yes (IPM motors
only)
Yes
Automatically adjusts the
voltage applied to motors
to maximize motor
efficiency for all load sizes.
High Slip
Braking
(HSB)
No (induction motor-
specific function)
No (induction motor-
specific function)
No (induction motor-
specific function)
No
Increases motor loss to let
the motor decelerate faster
than usual without a
braking resistor. Motor
characteristics have an
effect on this function.
Feed Forward
Control
*5
No Yes Yes No
Compensates effects of the
system inertia to increase
the speed precision when
the load changes.
KEB Ride-
Thru Function
*5
Yes Yes Yes Yes
Quickly and safely stops
the motor during power
loss and automatically
starts operation at the
previous speed when
restores power without
coasting the motor.
Overexcitation
Deceleration
No (induction motor-
specific function)
No (induction motor-
specific function)
No (induction motor-
specific function)
No
Sets the V/f higher than the
setting value during
deceleration to increase
motor loss and decrease
deceleration time.
Overvoltage
Suppression
Function
*5 *7
Yes Yes Yes Yes
Adjusts speed during
regeneration to prevent
overvoltage.
Sensorless
Zero Speed
Control
*5
No
Yes (IPM motors
only)
- No
Enabled with high
frequency injection with
IPM motors.
*1 Enabled when n8-57 = 1 [HFI Overlap Selection = Enabled].
*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.
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