Startup Procedure and
Test Run
4
4.8 Fine Tuning during Test Runs (Adjust the Control Function)
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 155
4.8 Fine Tuning during Test Runs (Adjust the Control
Function)
This section gives information about the adjustment procedures to stop hunting or oscillation errors caused by
control function during a test run. Adjust the applicable parameters as specified by your control method and drive
status.
Note:
This section only lists frequently adjusted parameters. If you must adjust parameters that have a higher degree of precision, contact the
manufacturer.
◆ V/f Control and Closed Loop V/f Control
Table 4.17 Parameters for Fine Tuning the Drive (V/f Control and Closed Loop V/f Control Methods)
Issue Parameter Number Solution Default
Setting
Recommended Setting
Hunting or oscillation at mid-range
speeds (10 Hz to 40 Hz)
n1-02 [HuntPrev Gain Setting
[
• If torque is not sufficient with heavy loads, decrease
the setting value.
• If hunting or oscillation occur with light loads,
increase the setting value.
• If hunting occurs with a low-inductance motor, for
example a motor with a larger frame size or a high-
frequency motor, lower the setting value.
1.00 0.10 - 2.00
• The volume of the motor
excitation sound is too high.
• Hunting or oscillation at low
speeds (10 Hz or lower), or at
mid-range speeds (10 Hz to 40
Hz)
C6-02 [Carrier Frequency
Selection]
• If the volume of the motor excitation sound is too
high, increase the carrier frequency.
• If hunting or oscillation occur at low or mid-range
speeds, decrease the carrier frequency.
1 (2 kHz)
*1
1 to upper limit value
• Torque or speed response are
slow.
• Hunting or oscillation
C4-02 [Trq Comp Delay
Time]
• If torque or speed response are slow, decrease the
setting value.
• If hunting or oscillation occur, increase the setting
value.
200 ms
*2
100 - 1000 ms
• Torque at low speeds (10 Hz or
lower) is not sufficient.
• Hunting or oscillation
C4-01 [Trq Comp Gain]
• If torque at low speeds (10 Hz or lower) is not
sufficient, increase the setting value.
• If hunting or oscillation occur with light loads,
decrease the setting value.
1.00 0.50 - 1.50
• Torque at low speeds (10 Hz or
lower) is not sufficient.
• Large initial vibration at start up.
• E1-08 [Mid AVoltage]
• E1-10 [Min Output
Voltage]
• If torque at low speeds (10 Hz or lower) is not
sufficient, increase the setting value.
• If there is large initial vibration at start up, decrease
the setting value
• E1-08: 15.0
V
*3
• E1-10: 9.0 V
*3
Default setting +/- 5 V
*4
In V/f control method, speed
precision is unsatisfactory.
C3-01 [Slip Comp Gain]
Set Mot Rated Current (FLA), Mot Rated Slip, and Mot
No-Load Current, then adjust C3-01.
0.0 (no slip
compensation)
0.5 - 1.5
In Closed Loop V/f control method,
speed precision is unsatisfactory.
• C5-01 [ASR PGain 1]
• C5-02 [ASR ITime 1]
*5
Adjust C5-01, C5-02.
• C5-01: 0.20
• C5-02: 0.200
s
• Proportional gain = 0.10 to
1.00
• Integral time = 0.100 to
2.000 s
*1 Default value changes when o2-04 [Drive KVA Selection] and C6-01 [ND/HD Duty Selection] values change.
*2 Default value changes when A1-02 [Control Method] and o2-04 [Drive KVA Selection] values change.
*3 Default value changes when A1-02 [Control Method] and E1-03 [V/f Pattern Selection] values change.
*4 Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
*5 In Closed Loop V/f Control, ASR only controls the output frequency. You cannot make a high-gain as in Closed Loop Vector control.
◆ Open Loop Vector Control Method
In Open Loop Vector Control, keep C4-01 [Trq Comp Gain] at its default setting (1.00). Do not adjust it.
If you cannot get speed precision during regeneration in Open Loop Vector Control, set C3-04 = 1 [Slip
Comp@Regen = Enable>6 Hz].
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