N5: Feed Forward Control - Omron Q2A Series Technical Manual

12.9 n: SPECIAL
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.
Name
(Hex.)
n4-73 PGO Recover Selection
(1B8D)
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.
Name
(Hex.)
n4-74 Flux Control Limit
(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.
◆

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
12.141 for more information. Refer to
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.
792
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.
Figure 12.142 for more information about parameters related to feed
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Default
(Range)
1
(1, 2)
Default
(Range)
160%
(100 - 500%)
Figure