Common drives and motor problems
The common drives and motor problems occur
due to an error in the
• Control logic
• Programming
• Motor/load
• Internal drive
Control logic problem occurs when the drive
does not respond to a given command.
Control logic problem is located by using the
status information displayed by the drive.
Correct reading indicates that the desired signal
is detected by the microprocessor of the drive.
If there is not a correct indication, the next step is
to determine whether the signal is present at the
control terminals of the drive.
This can be performed with a voltmeter or
oscilloscope.
Three areas where programming errors may
affect the drive and motor operation are
motor settings, references and limits, and I/O
configuration.
The drives must be set up correctly for the
compressors connected to it. If not, the
compressor may fail to start or use higher than
normal amount of current.
Check if the correct compressor is selected in
par. 1-13.
Any references or limits set incorrectly will result
in less than acceptable drive performance.
In case of doubt, reset the drive to factory
settings using par. 14-22.
Download again the OEM settings using the
copy and paste function in par. 0-50.
•
If the signal is present at the terminal,
the control card is defective and must be
replaced.
• If the signal is not present, the problem is
external to the drive.
The circuitry providing the signal along with its
associated wiring must then be checked.
Control logic problems
Programming problems
Figure 10: checking control
signal in the control card
11
FRCC.PC.036.A2.02
Check List
Summary of Contents for VLT CDS 302
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