12.9 n: SPECIAL
792 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
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 = CLVector] when you use an encoder option.
• When you set this parameter to 1, also set the number of PG pulses in F1-01 [Enc1 Pulse Count (PPR)].
1 : Without PG
2 : With PG
■ n4-73 PGO Recover Selection
No.
(Hex.)
Name Description
Default
(Range)
n4-73
(1B8D)
PGO Recover Selection
Sets the restart mode to Without Encoder Mode or the With Encoder Mode when an encoder is
disconnected.
1
(1, 2)
Set A1-02 = 4 [Control Method = Adv OLVector] and n4-72 = 1 [Spd Fbk Mode = Without PG] to use this
parameter.
Parameter F1-02 [PGOpen Detection Select], 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 when 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.
1 : Without PG
2 : With PG
■ n4-74 Flux Control Limit
No.
(Hex.)
Name Description
Default
(Range)
n4-74
(1B8E)
Flux Control Limit
Sets the control level for flux loop control output.
160%
(100 - 500%)
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.
◆ n5: FEED FORWARD CONTROL
Feed forward control increases the responsiveness of acceleration and deceleration as specified by the speed
reference.
Increase the values set in C5-01 [ASR PGain 1] and C5-03 [ASR PGain 2] to apply feed forward control to
machines that have low rigidity and are possible to have hunting and vibration or to machines that have a large
quantity of inertia. When you use this function in CLV control, it also helps prevent overshoot. Refer to Figure
12.141 for more information. Refer to Figure 12.142 for more information about parameters related to feed
forward control.
Set A1-02 [Control Method] is set to one of these values to enable feed forward control:
• 3: CLVector
• 4: Adv OLVector
• 6: PM AOLVector
• 7: PM CLVector
Note:
• You cannot use feed forward control to increase responsiveness in applications where you apply loads externally during run at constant
speed.
• When you use the Droop control function, set n5-01 = 0 [FF Control Selection = Disabled].
• You cannot use feed forward control with motor 2.
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