Performance Optimization - Omron VARISPEED L7 Manual

Performance Optimization

The following table gives adjustment advice for performance improvement after the basic setup has been
done.
Problem
Rollback at start
Jerk at start
Vibrations in low
and medium speed
area
Vibrations in the
high and top speed
area
Table 4.3 Performance Optimization
Possible Reason
V/f and
• Too less torque when the brake opens
OLV
• Too slow ASR response when the brake
CLV
opens.
• Motor torque is not fully established when
the brake opens.
Common
• Motor contactors close too late
• Motor starts turning when the brake is not
completely opened or runs against the
Common
brake
• Too fast acceleration rate change
• Too high output voltage
V/f
• Too fast torque compensation
OLV
• Too high output voltage
• Too high ASR settings
CLV
• Wrong motor slip value
• Too fast torque compensation
OLV
• Too high ASR settings
CLV
Countermeasure
• Increase the DC injection current at
start in parameter S1-02.
• Set the DC injection time at start S1-
04 as short as possible, but make
sure, that brake opens completely
before the motor starts to turn.
• Increase the minmum (E1-10) and
medium (E1-08) V/f pattern voltages.
Make sure, that the starting and level-
ing current does not rise too high.
• Increase the ASR gain at start (C5-
03) and decrease the ASR I time at
start (C5-04). If vibrations occur set
the values back in small steps.
• Increase the Zero servo gain in
parameter S1-20.
• Lengthen the brake release delay
time S1-06 and the DC injection/
zero servo time at start S1-04
• Make sure, that the contactors are
cosed before the Up/Down com-
mand is set.
• Increase the DC injection time at start
S1-04.
• Increase the S-Curve at start C2-01
• Reduce the V/f pattern settings (E1-
08 / E1-10)
• Increase the torque compesation
delay time (C4-02)
• Reduce the V/f pattern settings (E1-
08 / E1-10)
• Decrease C5-01 / C5-03 and increase
C5-02 / C5-04
• Check the motor slip value in param-
eter E2-02. Increase or decrease it in
steps of 0.2 Hz.
• Increase the torque compesation
delay time (C4-02)
• Decrease C5-01 / C5-03 and increase
C5-02 / C5-04
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