YASKAWA GA80U4720ABM Manual page 29

PM Open Loop Vector
Control method
Control
selection
(OLV/PM)
Controlled
Motor
High Slip Braking No (induction motor-specific
(HSB) function)
Feed Forward
No
*5
Control
KEB Ride-Thru
Yes
*5
Function
Overexcitation No (induction motor-specific
Deceleration function)
Overvoltage
Suppression Yes
*5
Function
Sensorless Zero
No
*5
Speed Control
*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 and motor 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.
Note:
When you set n8-35 = 1 [Initial Pole Detection Method = High Frequency Injection] and n8-57 = 1, do High Frequency Injection Auto-
Tuning.
YASKAWA SIEPC71061737B GA800 Drive Technical Reference
PM Advanced Open PM Closed Loop Vector
Loop Vector
(AOLV/PM) (CLV/PM)
PM Motor
No (induction motor-specific No (induction motor-specific
function) function)
Yes Yes
Yes Yes
No (induction motor-specific No (induction motor-specific
function) function)
Yes Yes
Yes (IPM motors only) -
1.3 Features and Advantages of Control Methods
EZ Open Loop Vector
Control Control
(EZOLV)
SynRM (Synchronous
Reluctance Motors)
No
No
Yes
No
Yes
No
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 restores power 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.
Enabled with high frequency
injection with IPM motors.
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