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Troubleshooting
ERRORS AND PROTECTIVE FUNCTIONS
6
6.4.7 Motor rotates but speed does not change
(1) Speed control
Y
N
Y
N
Y
N
Y
Y
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Y
Y
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N
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N
The motor rotates but
speed does not change.
Is the maximum speed
(Pr. 1) lower than the
speed setting?
Is the speed setting method
an external command?
Is the speed setting an
analog command?
Does the voltage of the
speed setting signal
(across 2-5) change?
Is the multi-speed
terminal off?
Is the torque restriction
function deactivated?
Is the acceleration/
deceleration time
adequate (not too long)?
Change the maximum speed
(Pr. 1) or speed setting to
match the specifications.
Speed setting
potentiometer fault
Open cable between
setting potentiometer
and terminal
Turn off the multi-
speed command.
Change the torque
restriction level to match
the specifications.
Rewrite the parameter
(Pr. 7, Pr. 8) value to
match the specifications.
Is the multi-speed terminal
on (changed)?
Have you input the speed
data to multiple speeds
(Pr. 4 to Pr. 6, Pr. 24 to
Pr. 27, Pr. 232 to Pr. 239)?
Input speeds to the
corresponding
parameters.
Have you changed the
speed command from
the PU?
Set the speed.
Turn on the multi-speed
terminal (change the ON
of the terminal.)
Please contact your sales
representative.