Hitachi SJ Series User Manual page 251

Chapter 12 Chapter 12 Chapter 12
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• Please refer to the following in addition to the notes • Please refer to the following in addition to the notes • Please refer to the following in addition to the notes • Please refer to the following in addition to the notes • Please refer to the following in addition to the notes • Please refer to the following in addition to the notes
for each control mode. for each control mode.
Phenomenon► Phenomenon
• The motor speed • The motor speed
follows the command follows the command
slowly.
• • The motor operates The motor operates
unstably.
• Overshoot and/or • Overshoot and/or
hunting occur. hunting occur.
• The motor speed • The motor speed
oscillates gently. oscillates gently.
• Stabilization of the • Stabilization of the
operation requires a long operation requires a long
time.
• It takes time for the • It takes time for the
command value and the command value and the
motor speed to be equal motor speed to be equal
to each other. to each other.
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• • When the revolution of the motor is hindered by When the revolution of the motor is hindered by When the revolution of the motor is hindered by When the revolution of the motor is hindered by When the revolution of the motor is hindered by
breaking or the motor lock caused by foreign breaking or the motor lock caused by foreign breaking or the motor lock caused by foreign breaking or the motor lock caused by foreign
objects may cause over current or the like. When objects may cause over current or the like. When objects may cause over current or the like. When objects may cause over current or the like. When objects may cause over current or the like. When
no such adjustment as ones mentioned above no such adjustment as ones mentioned above no such adjustment as ones mentioned above no such adjustment as ones mentioned above
improves the state, checking the porti improves the state, checking the porti improves the state, checking the porti improves the state, checking the portion around the
motor may sometimes improves it. motor may sometimes improves it. motor may sometimes improves it.
Estimated cause(s)► Estimated cause(s)
►
• Response of the output Response of the output Response of the output
is slow and the change is slow and the change is slow and the change
in the fed-back value is in the fed back value is
slow.
• Response to the Response to the
fed-back value is too back value is too back value is too
quick.
• Response to the Response to the
integral operation is integral operation is integral operation is
slow.
• Response of the output Response of the output Response of the output
is slow and the change is slow and the change is slow and the change
in the fed-back value is in the fed back value is
slow.
on around the
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Exemplar measures to be taken Exemplar measures to be taken Exemplar measures to be taken Exemplar measures to be taken
• Increment the proportional (P) gain [Hb170]. Increment the proportional (P) gain [Hb170]. Increment the proportional (P) gain [Hb170]. Increment the proportional (P) gain [Hb170]. Increment the proportional (P) gain [Hb170].
• Decrement the proportional (P) gain [Hb170]. Decrement the proportional (P) gain [Hb170]. Decrement the proportional (P) gain [Hb170]. Decrement the proportional (P) gain [Hb170]. Decrement the proportional (P) gain [Hb170].
• Increment the integral (I) gain [Hb171]. Increment the integral (I) gain [Hb171]. Increment the integral (I) gain [Hb171]. Increment the integral (I) gain [Hb171].
• Decrement the integral (I) gain [Hb171]. Decrement the integral (I) gain [Hb171]. Decrement the integral (I) gain [Hb171]. Decrement the integral (I) gain [Hb171].
• If an application of load results in a great amount of If an application of load results in a great amount of If an application of load results in a great amount of If an application of load results in a great amount of If an application of load results in a great amount of If an application of load results in a great amount of
change in the inverter's outp change in the inverter's outp change in the inverter's outp change in the inverter's output frequency monitor
[dA-01], function [dA functions which change frequencies
automatically, such as overload limiting function, automatically, su automatically, su ch as overload limiting function, ch as overload limiting function,
non-stop at momentary non t momentary-stop, and over volt
suppression function may work depending upon suppression function may work depending upon suppression function may work depending upon suppression function may work depending upon suppression function may work depending upon
the settings of the functions. For details, see "Chap. the settings of the functions. For details, see "Chap. the settings of the functions. For details, see "Chap. the settings of the functions. For details, see "Chap. the settings of the functions. For details, see "Chap. the settings of the functions. For details, see "Chap.
18: Troubleshooting." 18: Troubleshooting." 18: Troubleshooting."
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Inverter Function Inverter Function Inverter Function
ut frequency monitor ut frequency monitor
which change frequencies which change frequencies
stop, and over voltage stop, and over volt