YASKAWA GA700 Series Technical Manual page 927

Note:
Increase the setting value to increase the stability when the drive is operating at low speed. It can make the speed control less accurate.
• When the motor rotates faster than the frequency reference at low speed, decrease the setting value in 0.1 Hz
increments.
Note:
If you set the value too low, the motor can rotate in reverse.
■
n4-71: Flux Estimation Method
No.
Name
(Hex.)
n4-71 Flux Estimation Method
(1B8B)
Expert
0 : Method 1
1 : Method 2
■
n4-72: Speed Feedback Mode
No.
Name
(Hex.)
n4-72 Speed Feedback Mode
(1B8C)
You can connect a PG-B3 or PG-X3 encoder option in AOLV control. You can use the encoder option for better
speed control precision.
Note:
• When you use an encoder option in AOLV control to operate machinery, specialized tuning of the drive can be necessary. You should
usually set A1-02 = 3 [Control Method Selection = Closed Loop Vector] when you use an encoder option.
• When you set this parameter to 1, also set the number of PG pulses in F1-01 [Encoder 1 Pulse Count (PPR)].
0 : Without Encoder
1 : With Encoder
■
n4-73: PGo Recovery Selection
No.
Name
(Hex.)
n4-73 PGo Recovery Selection
(1B8D)
Set A1-02 = 4 [Control Method Selection = AOLV] and n4-72 = 1 [Speed Feedback Mode = With Encoder] to
use this parameter.
Parameter F1-02 [Encoder Signal Loss Detect Sel] sets the drive response when the drive detects a disconnected
encoder. This parameter sets the drive to start up in the Without Encoder Mode or With Encoder Mode if the drive
detects PGo [Encoder (PG) Feedback Loss].
Note:
A PG-B3 encoder option is necessary to use this parameter. When you use a PG-X3 option, it is not necessary to set this parameter.
If the drive detects PGo, de-energize the drive and examine the wiring for the encoder.
0 : Without Encoder
1 : With Encoder
■
n4-74: Limit of Flux Loop
No.
Name
(Hex.)
n4-74 Limit of Flux Loop
(1B8E)
If the torque is not sufficient because of 100% or more loads, increase the setting value in 20% increments. If the
setting is too high, overexcitation could occur and overheat the motor.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets the flux estimation method. Usually it is not necessary to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the requirement for an encoder option when A1-02 = 4 [Control Method Selection =
Advanced Open Loop Vector].
V/f CL-V/f OLV CLV AOLV
Sets the restart mode to Without Encoder Mode or the With Encoder Mode when an encoder is
disconnected.
V/f CL-V/f OLV CLV AOLV
Sets the control level for flux loop control output.
12.10 n: Special Adjustment
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
0
(0, 1)
Default
(Range)
0
(0, 1)
Default
(Range)
0
(0, 1)
Default
(Range)
250%
(100 - 500%)
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