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Troubleshooting
Troubleshooting
and Maintenance
6–4
The motor speed will not reach
the target frequency (desired
speed).
•
If using the analog input, is the
current or voltage at “O” or “OI?”
•
Check the wiring.
•
Check the potentiometer or
signal generating device.
•
Is the load too heavy?
•
Reduce the load.
•
Heavy loads activate the
overload restriction feature
(reduces output as needed).
The rotation is unstable.
•
Is the load fluctuation too great?
•
Is the supply voltage unstable?
•
Is the problem occurring at a partic-
ular frequency?
•
Increase the motor capacity
(both inverter and motor).
•
Fix power supply problem.
•
Change the output frequency
slightly, or use the jump
frequency setting to skip the
problem frequency.
The RPM of the motor does not
match the inverter output
frequency setting.
•
Is the maximum frequency setting
A04 correct?
•
Does the monitor function D01
display the expected output
frequency?
•
Verify the V/F settings
match motor specifications.
•
Make sure all scaling (such
as A11 to A14) is properly
set.
Inverter data
is not
correct.
No downloads
have occurred.
•
Was power turned off after a
parameter edit but before pressing
the Store key?
•
Edit the data and press the
Store key once.
•
Edits to data are permanently
stored at power down. Was the time
from power Off to power On less
than six seconds?
•
Wait six seconds or more
before turning power Off
after editing data.
A download to
the inverter was
attempted.
•
Was the power turned off within six
seconds after the display changed
from REMT to INV?
•
Copy the data to the inverter
again, and keep power on for
six seconds or more after
copying.
A parameter
will not
change after
an edit
(reverts to
old setting).
True for certain
parameters
•
Is the inverter in Run Mode? Some
parameters cannot be edited during
Run Mode.
•
Put inverter in Stop Mode
(press the Stop/reset key).
Then edit the parameter.
True for all
parameters
•
If you’re using the [SFT] intelligent
input (software lock function), — is
the [SFT] input on?
•
Is switch 4 (located on the back of
the remote operator copy unit) On?
•
Change the state of the SFT
input, and check the B31
parameter (SFT mode).
•
Turn the switch off.
Symptom/condition Probable Cause Solution
Technologies Inc.
Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com