YASKAWA GA700 Technical Manual page 170

3.10 Fine Tuning during Test Runs (Adjustment of Control Functionality)
Issue
n8-51 [Accel / Decel Pull-
In Current]
• b2-02 [DC Injection
• b2-03 [DC Inject
• Oscillation occurs
when motor starts.
• Motor stalls.
n8-55 [Load Inertia]
n8-47 [Pull-
InCurCompensationTime
Const]
n8-48 [Pull-In Current
(for PM Motors)]
Load is connected, and
while running at a
constant speed, motor
stalls or oscillates.
n8-55 [Load Inertia]
n8-45 [Spd Feedback
Hunting, oscillation
Detect Control Gain]
• E5-09 [PM Back-EMF
Even though the load is
not large, STPo [Pull-Out
• E5-24 [PM Back-EMF
Detection] occurs.
Output voltage was
saturated during high-
n8-62 [Output Voltage
speed operation and
Limit (for PM)]
oscillation or STPo [Pull-
Out Detection] occurred.
*1 Differs depending on settings for E5-01 [Motor Code Selection] and o2-04 [Drive Model Selection], when at default settings.
170
Parameter Number
Increase setting value.
Perform DC Injection
Braking when the motor
starts up.
Note:
Braking Current]
When the motor starts,
it may rotate in reverse
Braking Time at Start]
for about 1/8 of a turn,
so caution should be
observed.
Increase setting value.
Note:
Caution should be
observed when running
the motor by itself or
with a minimum
amount of inertia. If
too high a value is set,
oscillation may be
produced.
Reduce the setting value.
Increase setting value.
Increase setting value.
Note:
Caution should be
observed when running
the motor by itself or
with a minimum
amount of inertia. If
too high a value is set,
oscillation may be
produced.
Increase setting value.
• Adjust the setting
value.
• While referring to the
Vpeak (mV/(rad/s))]
motor code on the
motor nameplate or the
L-L Vrms (mV/rpm)] data sheet, correctly
input values for E5-09
or E5-24.
Set so it is lower than the
actual input power supply
voltage.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Solution Default Setting
50 %
• b2-02: 50%
• b2-03: 0.0 s
0
5.0 s
30 %
0
0.80
*1
• 200.0 V
• 400.0 V
Suggested Setting
Increase in increments of
5%.
• b2-02: Adjust as
necessary.
• b2-03: 0.5 s
Adjust to match the actual
inertia ratio.
Reduce in increments of
0.2 s.
Increase in increments of
5%.
Adjust to match the actual
inertia ratio.
Increase in increments of
0.05.
• Yaskawa motor
Input the motor code
found on the motor
nameplate.
• Motor from another
manufacturer
Input the values listed
in the test report.
Set so it is lower than the
actual input power supply
voltage.