104
Troubleshooting
Trouble
Cause
Corrective Actions
The motor does not
operate when an
external operation
signal is input.
The operation method selection
is wrong.
The run command (n02) is not set to
Control Circuit Terminal
.
Set the run command (n02) to
Control Circuit Terminal.
A 3-wire sequence is in effect.
The multi-function input method (n37)
is set to 3-wire sequence, and the S2
control terminal is not closed.
To use a 3-wire sequence, make the
wiring so that the S2 control terminal
is closed. To use a 2-wire sequence,
set the multi-function input (n37) to a
value other than 3-wire sequence.
The frequency reference is too
low.
The input frequency reference is
lower than the setting for the
min.output frequency (n14).
Input a frequency reference greater
than the min. output frequency (n14).
Local mode is in effect.
Set the LO/RE selection of the digital
operator to RE.
The SW setting for the refer-
ence selection is wrong.
Example: The reference 4-20 mA is
input, but the SW is set to “V.”
For analog input, make sure that the
frequency reference (n03) and SW8
settings are correct.
The setting of NPN/PNP switch
(SW7) is not correct.
Set SW7 correctly.
The motor stops. The
torque is not output.
The stall prevention level dur-
ing acceleration is too low.
Because the stall prevention level
during acceleration (n56) is set too
low, the output current reaches the
set level, the output frequency is
stopped, and the acceleration time is
lengthened.
Check if the stall prevention level
during acceleration (n56) is set to an
appropriate value.
The stall prevention level dur-
ing running is too low.
Because the stall prevention level
during running (n57) is set too low, the
output current reaches the set level,
and the speed drops.
Check if the stall prevention level
during running (n57) is set to an
appropriate value.
The load is too heavy.
If the load is too heavy, stall
prevention is activated, the output
frequency is stopped, and the
acceleration time is lengthened.
• Lengthen the set acceleration time
(n16).
• Reduce the load.
When the maximum frequency
was changed, the maximum
voltage frequency was also
changed.
To increase the speed of a general-
purpose motor, only change the
maximum frequency.
The V/f set value is too low.
Set the V/f (n09 to n15) according to
the load characteristics.