Common Drives And Motor Problems; Control Logic Problems; Programming Problems - Danfoss CDS 302 Troubleshooting Manual

Check List

Control logic problems

Figure 10: checking control
signal in the control card

Programming problems

Common drives and motor problems

The common drives and motor problems occur
due to an error in the
• Control logic
• Programming
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 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.
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.
• Motor/load
• Internal 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.
The circuitry providing the signal along with its
associated wiring must then be checked.
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.
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