Troubleshooting - YASKAWA VS mini J7 Series Instruction Manual

Troubleshooing
Trouble
The motor does The operation method selection is
not operate when wrong.
an external The run command (n02) is not set to
operation signal is Control Circuit Terminal.
input.
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.
The frequency reference is too
low.
The input frequency reference is
lower than the setting for the
min.output frequency (n14).
Local mode is in effect.
The SW setting for the reference
selection is wrong.
Example: The reference 4-20mA is
input, but the SW is set to "V".
The motor stops. The stall prevention level during
The torque is not acceleration is too low.
output. 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.
The stall prevention level during
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.
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.
Cause Corrective Actions
Set the run command (n02) to
Control Circuit Terminal.
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.
Input a frequency reference
greater than the min. output
frequency (n14).
Set the LO/RE selection of the
digital operator to RE.
For analog input, make sure that
the frequency reference (n03)
and SW settings are correct.
Check if the stall prevention level
during acceleration (n56) is set to
an appropriate value.
Check if the stall prevention level
during running (n57) is set to an
appropriate value.
Lengthen the set acceleration
time (n16). Reduce the load.
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