YASKAWA GA800

1.3 Features and Advantages of Control Methods
32 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Control Method
Selection
PM Open Loop Vector
Control
(OLV/PM)
PM Advanced Open
Loop Vector
(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)
-
High Slip Braking
(HSB) Activate
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
*4
No Yes Yes No
Compensates effects of the system
inertia to increase the speed
precision when the load changes.
KEB Ride-Thru
Function
*4
Yes Yes Yes Yes
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.
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
*4
Yes Yes Yes Yes
Adjusts speed during regeneration to
prevent overvoltage.
Sensorless Zero
Speed Control
*4
No Yes (IPM motors only) - No
Enables zero speed control using
high frequency injection on IPM
motors.
*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.