N: Special; N1: Hunting Prevention - Omron Q2A Series Technical Manual

12.9

n: SPECIAL

n parameters set these functions:
• Function to prevent hunting
• High-slip braking
• Motor line-to-line resistance online tuning
• Fine-tune the parameters that adjust motor control
◆

n1: HUNTING PREVENTION

The Hunting Prevention function will not let low inertia or operation with a light load cause hunting. Hunting
frequently occurs when you have a high carrier frequency and an output frequency less than 30 Hz.
■
n1-01 HuntPrev Selection
No.
Name
(Hex.)
n1-01 HuntPrev Selection
(0580)
When drive response is more important than the decrease of motor vibration, disable this function.
If hunting occurs, or if you use a high carrier frequency or SwingPWM, set this parameter to 2 for better hunting
prevention.
1 : Enabled
2 : Enabled (High Carrier)
3 :
■
n1-02 HuntPrev Gain Setting
No.
Name
(Hex.)
n1-02 HuntPrev Gain Setting
(0581)
Expert
Adjust this parameter in these conditions:
• When n1-01 = 2, 3 [HuntPrev Selection = Enabled (High Carrier), ]: If oscillation occurs when you operate a
motor with a light load, increase the setting value in 0.1-unit increments.
• When n1-01 = 2, 3, if the motor stalls: Decrease the setting value in 0.1-unit increments.
■
n1-03 HuntPrev Time Constant
No.
Name
(Hex.)
n1-03 HuntPrev Time Constant
(0582)
Expert
Adjust this parameter in these conditions:
• Load inertia is large: Increase the setting value. If the setting value is too high, response will be slower. Also,
there will be oscillation when the frequency is low.
• Oscillation occurs at low frequencies: Decrease the setting value.
■
n1-05 HuntPrev Gain Reverse Mode
No.
Name
(Hex.)
n1-05 HuntPrev Gain Reverse
Mode
(0530)
Expert
Note:
When you set this parameter to 0, the value set in n1-02 [HuntPrev Gain Setting] is effective when the motor rotates in reverse.
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets the function to prevent hunting.
V/f CL-V/f OLV CLV AOLV
Adjusts the behavior of the hunting prevention function. Usually it is not necessary to change this
setting.
V/f CL-V/f OLV CLV AOLV
Sets the primary delay time constant of the hunting prevention function. Usually it is not
necessary to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the performance of the hunting prevention function. This parameter adjusts Reverse run.
Usually it is not necessary to change this setting.
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

12.9 n: SPECIAL

Default
(Range)
Determined by o2-04
(0 - 2)
Default
(Range)
1.00
(0.00 - 2.50)
Default
(Range)
Determined by o2-04
(0 - 500 ms)
Default
(Range)
0.00
(0.00 - 2.50)
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