YASKAWA GA800 Technical Reference page 31

*3 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.
• Motor loss increases during overexcitation braking and high-slip braking. Use a maximum braking frequency of 5% ED and a
maximum braking time of 90 seconds. After you start high-slip braking, you cannot restart the motor until it stops. Use overexcitation
braking to decelerate over a shorter time at a pre-determined speed.
• Acceleration and deceleration have priority over torque limits in Open Loop Vector Control during acceleration and deceleration (soft
start changes). The drive will not operate until the speed is at the minimum frequency or the reverse direction of motor rotation when
the motor speed decreases because of torque limits during constant speed control. Set L7-07 = 1 [Torque Limit during Accel/Decel =
Proportional & Integral control] to enable torque limits during acceleration/deceleration (for winding applications).
Table 1.7 OLV/PM, AOLV/PM, CLV/PM and EZOLV Features and Advantages of Control Methods
PM Open Loop Vector
Control Method
Control
Selection
(OLV/PM)
Controlled
Motor
Parameter Settings A1-02 = 5
PM Open Loop Vector
Basic Control
Control (no speed controller)
• General-purpose variable
speed control for PM
motors
• Applications in which a
Main Applications
high level of
responsiveness and
accurate speed control are
not necessary.
PG Option Card Not necessary
Maximum Output
590 Hz
Frequency
Speed Control
1:20 AM
Range
Starting Torque 100% / 5% speed
Stationary, Stator Resistance,
*4
Auto-Tuning Rotational, High Frequency
Injection
*4
Torque Limits No
*4
Torque Control No
*4
Droop Control No
Zero Servo Control
No
*4
*4
Speed Search Yes
Automatic Energy-
No
*4
saving Control
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
PM Advanced Open PM Closed Loop Vector
Loop Vector
(AOLV/PM) (CLV/PM)
PM motor
A1-02 = 6 A1-02 = 7
PM Open Loop Current PM Closed Loop Current
Vector Control (with speed Vector Control (with speed
controller) controller)
• General-purpose variable
speed control for IPM Very high-performance PM
motors motor control with motor
encoders
• Applications in which
high-precision speed Example: Torque control and
control and torque limits torque limits
are necessary.
Not necessary Necessary (PG-X3)
400 Hz 400 Hz
1:20 AM
1:1500
*1 *2
1:100
100% / 5% speed
200% / 0 min
*1 *3
200% / 0 min -1
Stationary, Stator Resistance, Stationary, Stator Resistance,
Rotational, High Frequency Z-phase, Rotational, High
Injection Frequency Injection
Yes Yes
*5
Yes Yes
No Yes
No Yes
Yes Yes
Yes (IPM motors only) Yes (IPM motors only)
1.3 Features and Advantages of Control Methods
EZ Open Loop Vector
Control Control
(EZOLV)
Induction Motors/PM
Motors/SynRM
(Synchronous
Reluctance Motors)
A1-02 = 8
Open Loop Current Vector
Control
Low-speed torque
applications
Example: Fans and pumps
Not necessary
120 Hz
1:100
*3
-1
100% / 1% speed
Line-to-Line Resistance
Yes
No
No
No
Yes (Although NOT
operation in the reverse
direction of the Run
command)
Yes
Notes
-
-
-
-
-
-
This is the range of variable control.
When you connect and operate
motors in this mode, think about the
increase in motor temperature.
This is the motor torque that the
drive can supply at low speed during
start-up and the related output
frequency (rotation speed).
When a large quantity of torque is
necessary at low speed, you must
think about drive capacity and motor
capacity.
Automatically tunes electrical motor
parameters.
Controls maximum motor torque to
prevent damage to machines and
loads.
Directly controls motor torque to
control tension and other
parameters.
Sets load torque slip for motors.
Distributes motor loads.
Locks servos without an external
position controller to prevent
movement caused by external force.
Immediately estimates (or detects)
motor speed and direction when
coasting to a stop to quickly start-up
the drive without stopping the
motor.
Automatically adjusts the voltage
that the drive applies to the motor to
maximize motor efficiency for small
and large loads.
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