YASKAWA GA700 Series Technical Manual page 30

1.3 Features and Advantages of Control Methods
PM Open Loop Vector
Control Method
Control
Selection
(OLV/PM)
Controlled
Motor
High Slip Braking No (induction motor-
(HSB) Activate specific function)
Feed Forward
No
*4
Control
KEB Ride-Thru
Yes
*4
Function
Overexcitation No (induction motor-
Deceleration specific function)
Overvoltage
Suppression Yes
*4 *6
Function
Sensorless Zero
No
*4
Speed Control
*1 Sets n8-57 = 1 [HFI Overlap Selection = Enabled]. When you use a non-Yaskawa PM motor, do Rotational Auto-Tuning.
*2 Speed control range of 1:100 is Instantaneous operation range. Correctly select the drive and motor capacity for continuous
operation.
*3 Correctly select the drive and motor capacity.
*4 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 if you connect more than one motor 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.
*5 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.
Note:
When you set n8-35 = 1 [Initial Pole Detection Method = High Frequency Injection] and n8-57 = 1, do High Frequency Injection Auto-
Tuning.
*6 Do not use this function with hoist application.
30
PM Advanced Open PM Closed Loop Vector
Loop Vector
(AOLV/PM)
PM motor
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) -
EZ Open Loop Vector
Control Control
(CLV/PM) (EZOLV)
Induction Motors/PM
Motors/SynRM
(Synchronous
Reluctance Motors)
No
No
Yes
No
Yes
No
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Notes
-
Increases motor loss to let the
motor decelerate faster than usual
without a braking resistor. Motor
characteristics have an effect on
this function.
Compensates effects of the system
inertia to increase the speed
precision when the load changes.
Quickly and safely stops the motor
during power loss and
automatically starts operation at the
previous speed when the drive
applies power again without
coasting the motor.
Sets the V/f higher than the setting
value during deceleration to
increase motor loss and decrease
deceleration time.
Adjusts speed during regeneration
to prevent overvoltage.
Enables zero speed control using
high frequency injection on IPM
motors.