Motor Rotates But Speed Does Not Change; Speed Control - Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual

6.4.7

Motor rotates but speed does not change

(1) Speed control

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)?
Please contact your sales
representative.
N
Change the maximum speed
(Pr. 1) or speed setting to
Y
match the specifications.
N
Y
N
Y
Is the multi-speed terminal
on (changed)?
N
Speed setting
Y potentiometer fault
Open cable between
setting potentiometer
Have you input the speed
and terminal
data to multiple speeds
(Pr. 4 to Pr. 6, Pr. 24 to
N
Pr. 27, Pr. 232 to Pr. 239)?
Turn off the multi-
Input speeds to the
speed command.
Y corresponding
parameters.
N
Change the torque
Y
restriction level to match
the specifications.
N
Rewrite the parameter
Y
(Pr. 7, Pr. 8) value to
match the specifications.
90
Y
Have you changed the
speed command from
the PU?
N
Set the speed.
N
Y
Turn on the multi-speed
terminal (change the ON
of the terminal.)
Y
N
Troubleshooting
6