YASKAWA CR700, Техническое руководство, Страница: 27 / 886

Receiving
1
1.4 Control Method Type and Corresponding Features
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 27
Control Method
Open Loop Vector Control
(OLV)
Closed Loop Vector Control
(CLV)
Advanced Open Loop Vector
Control
(AOLV)
Notes
Controlled Motor Induction Motor -
Auto-Tuning
*2
Rotational, Stationary, and Line-
to-Line Resistance
Rotational, Stationary, and Line-
to-Line Resistance
Rotational, Stationary, and Line-
to-Line Resistance
Automatically tunes electrical motor
parameters.
Torque Limits
*2
Yes Yes Yes
Controls maximum motor torque to protect
machines and loads.
Droop Control
*2
No Yes Yes
Sets load torque slip for motors. Used to
distribute motor loads.
Zero Servo Control
*2
No Yes No
Locks servos without an external position
controller to prevent movement caused by
external force.
Feed Forward Control
*2
No Yes Yes
Improves speed accuracy when the load
changes by compensating effects of the
system inertia.
Overexcitation
Deceleration
*2
Yes Yes Yes
Decreases the deceleration time by
increasing motor loss by setting V/f higher
than the setting value during deceleration.
*1 Select the drive capacity accordingly.
*2 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.
• 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 s. Use overexcitation braking to decelerate over a shorter time at a pre-determined speed.
• Acceleration and deceleration have priority over torque limits in OLV 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).