YASKAWA CIPR-GA50C series Technical Manual page 25

Control Method Selection
Controlled Motor
Starting Torque
*2
Auto-Tuning
*2
Torque Limits
*2
Speed Search
*2
Automatic Energy-saving Control
High Slip Braking (HSB)
Feed Forward Control
*2
KEB Ride-Thru Function
*2
Overexcitation Deceleration
*2 *3
Overvoltage Suppression Function
*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 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).
*3 Do not use this function with hoist application.
Table 1.7 Features and Advantages of OLV/PM, AOLV/PM, and EZOLV Control
PM Open Loop Vector
Control Method
Control
Selection
(OLV/PM)
Controlled Motor
Parameter Settings A1-02 = 5
PM Open Loop Vector Control (no
Basic Control
speed controller)
• General-purpose variable speed
control for PM motors
• Applications in which a high
Main Applications
level of responsiveness and
accurate speed control are not
necessary.
Maximum Output
590 Hz
Frequency
Speed Control Range 1:10
Starting Torque 100% / 5% speed
Stationary, Stator Resistance,
*5
Auto-Tuning
Rotational
YASKAWA SIEPC71061753A GA500 Technical Manual
Open Loop Vector
(OLV)
Induction Motor
*1
150% / 1 Hz
Rotational, Stationary, and Line-to-Line Resistance
Yes
Yes
Yes
No
No
Yes
Yes
Yes
PM Advanced Open Loop
Vector
(AOLV/PM)
PM Motor
A1-02 = 6
PM Open Loop Current Vector
Control (with speed controller)
• General-purpose variable speed
control for IPM motors
• Applications in which high-
precision speed control and
torque limits are necessary.
270 Hz
1:10
*1 *2 *3
1:100
100% / 5% speed
*1
100% / 0 min -1
Stationary, Stator Resistance,
Rotational
1.3 Features and Advantages of Control Methods
This is the motor torque that the drive can supply at low speed during
start-up and the related output frequency (rotation speed).
You must think about drive capacity when a large quantity of torque is
necessary at low speed.
Automatically tunes electrical motor parameters.
Controls maximum motor torque to prevent damage to machines and
loads.
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.
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.
EZ Open Loop Vector 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
120 Hz
1:10
100% / 10% speed
Line-to-Line Resistance
Notes
-
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).
You must think about drive capacity when
a large quantity of torque is necessary at
low speed.
Automatically tunes electrical motor
parameters.
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