4.8 Fine Tuning during Test Runs (Adjust the Control Function)
158 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
◆ Fine-Tuning Open Loop Vector Control for PM Motors
Table 4.21 Parameters for Fine-Tuning Performance in OLV/PM
Issue Parameter Number Solution Default
Setting
Recommended Setting
Unsatisfactory motor performance
E1: V/F PARAMETER
MOTOR 1 parameters,
E5: PM MOTOR SETTINGS
parameters
• Check the settings for E1-06 [Base Frequency], E1-
04 [Max Output Frequency].
• Check the E5: PM MOTOR SETTINGS parameters
and make sure that all motor data has been set
correctly.
Note:
Do not set E5-05 [PM Mot Resistance (Ohms/
Phase)] to a line-to-line resistance value.
• Do Auto-Tuning.
- -
Unsatisfactory motor torque and
speed response
n8-55 [Load Inertia]
Adjust to match the load inertia ratio of the motor and
machine.
1
Near the actual load inertia
ratio.
n8-45 [SpdFbck Det.Gain] Decrease the setting value in increments of 0.05. 0.80 -
C4-01 [Trq Comp Gain]
Adjust the setting value.
Note:
Setting this value too high can cause
overcompensation and motor oscillation.
0.00 1.00
• Oscillation at start.
• Motor stalls.
n8-51 [Ac/Dec Pull-In
Current]
Increase the setting value in increments of 5%. 50% -
• b2-02 [DCI Braking
Current]
• b2-03 [DCInj Time@Start]
Use DC Injection Braking at start.
Note:
This can cause the motor to rotate in reverse for
approximately 1/8 of a turn at start.
• b2-02: 50%
• b2-03: 0.0 s
• b2-02: Adjust as necessary.
• b2-03: 0.5 s
n8-55 [Load Inertia]
Increase the setting value.
Note:
When operating a single motor or with a minimum
amount of inertia, setting this value too high can
cause motor oscillation.
1
Near to the actual load inertia
ratio.
There is too much current during
deceleration.
n8-79 [Pull-In
Curr@Deceleration]
Set n8-79 < n8-51.
0%
Note:
When n8-
79 = 0, the
drive will
apply the
n8-51
setting to
the pull-in
current
during
decelera
tion.
Decrease in increments of 5%.
Stalling or oscillation occurs when
load is applied during constant speed
n8-47 [Pull-In Comp.Time
Constant]
Decrease the setting value in increments of 0.2 s. 5.0 s -
n8-48 [Pull-In Current (for
PM Motors)]
Increase the setting value in increments of 5%. 30% -
n8-55 [Load Inertia]
Increase the setting value.
Note:
When operating a single motor or with a minimum
amount of inertia, setting this value too high can
cause motor oscillation.
1
Near to the actual load inertia
ratio.
Hunting or oscillation n8-45 [SpdFbck Det.Gain] Increase the setting value in increments of 0.05. 0.80 -
The drive detects STPo [Motor Step-
Out Detected] fault when the load is
not too high.
• E5-09 [PM BackEMF
Vpeak (mV/(rad/ s))]
• E5-24 [PM BackEMF L-L
Vrms (mV/rpm)]
• Adjust the setting value.
• Examine the motor code on the motor nameplate or
the data sheet, then set correct values for E5-09 or
E5-24.
*1
• Yaskawa motor
Set the motor code from
the motor nameplate.
• Motor from another
manufacturer
Set the values from the test
report.
The drive detected stalling or STPo
[Motor Step-Out Detected] at high
speed and maximum output voltage.
n8-62 [Output Volt Limit
Level]
Set to a value lower than the actual input voltage. • 400.0 V -
*1 Default value changes when E5-01 [PM Mot Code Selection] and o2-04 [Drive KVA Selection] values change.
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