YASKAWA CR700

Startup Procedure and Test Run
3
3.12 Controllability Problems and Possible Solutions
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 239
Table 3.30 Parameters for Fine Tuning the Drive (Open Loop Vector Control Method)
Issue Parameter Number Possible Solutions Default Recommended Setting
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation at mid-
range speeds (10 Hz to 40 Hz)
n2-01 [Automatic Freq Regulator
Gain(F)]
• To increase the speed of torque
or speed response, decrease
the setting value in 0.05-unit
increments.
• If hunting or oscillation occur,
decrease the setting value in
0.05-unit increments.
1.00 0.50 - 2.00
n2-02 [Automatic Freq Regulator
Time 1]
• To increase the speed of torque
or speed response, decrease
the setting value in 10 ms
increments and examine the
response.
• If hunting or oscillation occur
or if the load inertia is too
much, increase the setting
value in 50 ms increments and
examine the response.
Note:
Make sure that this parameter
setting is: n2-02 ≤ n2-03
[Automatic Freq Regulator
Time 2].
When you adjust n2-02, you
must also increase the C4-02
[Torque Compensation Delay
Time] value by the same ratio.
50 ms 50 ms to 2000 ms
ov [Overvoltage] occurs when the
drive stops accelerating, starts to
decelerate, or when there are
large changes in the load.
n2-03 [Automatic Freq Regulator
Time 2]
• If ov occurs, increase the
setting value in 50 ms
increments and examine the
response.
• If the response is not
sufficient, decrease the setting
value in 10 ms increments and
examine the response.
Note:
Make sure that this parameter
setting is: n2-02 [Automatic
Freq Regulator Time 1] ≤ n2-
03. When you adjust n2-03,
you must also increase the
C4-06 [Motor 2 Torque Comp
Delay Time] value by the
same ratio.
750 ms 750 ms to 2000 ms
C4-06 [Motor 2 Torque Comp
Delay Time]
• If ov occurs, increase the
setting value in 10 ms
increments and examine the
response.
• If the response is not
sufficient, decrease the setting
value in 2 ms increments and
examine the response.
Note:
Make sure that this parameter
setting is: C4-02 [Torque
Compensation Delay Time] ≤
C4-06.
When you adjust C4-06, you
must also increase the n2-03
[Automatic Freq Regulator
Time 2] value by the same
ratio.
150 ms 150 ms to 750 ms
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation
C4-02 [Torque Compensation
Delay Time]
• If torque or speed response are
slow, decrease the setting
value in 2 ms increments.
• If hunting or oscillation occur,
increase the setting value in 10
ms increments.
Note:
Make sure that this parameter
setting is: C4-02 ≤ C4-06
[Motor 2 Torque Comp Delay
Time].
When you adjust C4-02, you
must also increase the n2-02
[Automatic Freq Regulator
Time 1] value by the same
ratio.
20 ms
*1
20 ms - 100 ms
*1
• Speed response is slow.
• Speed is not stable.
C3-02 [Slip Compensation Delay
Time]
• If speed response is slow,
decrease the setting value in
10 ms increments.
• If speed is not stable, increase
the value in 10 ms increments.
200 ms
*1
100 ms to 500 ms