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SJ300 Inverter
Troubleshooting
and Maintenance
6–3
Troubleshooting
Tips
The table below lists typical symptoms and the corresponding solution(s).
Symptom/condition Probable Cause Solution
The motor
will not run.
The inverter
outputs U, V, W
are not supplying
voltage.
• Is the frequency command source
A001 parameter setting correct?
• Is the Run command source A002
parameter setting correct?
• Make sure the parameter
setting A001 is correct.
• Make sure the parameter
setting A002 is correct.
• Is power being supplied to terminals
[R], [S], and [T] ([L1], [L2], and
[L3])? If so, the POWER lamp should
be ON.
• Check terminals [R], [S], and
[T] ([L1], [L2], and [L3]), then
[U], [V], and [W] ([T1], [T2],
and [T3]).
• Turn ON the power supply or
check fuses.
• Is there an error code
EXX.X
displayed?
• Press the Func. key and deter-
mine the error type. Eliminate
the error cause, then clear the
error (Reset).
• Are the signals to the intelligent input
terminals correct?
• Is the Run Command active?
• Is the [FW] terminal (or [RV])
connected to P24 (via switch, etc.)
• Verify the terminal functions
for C001 - C008 are correct.
• Turn ON Run command
enable.
• Supply 24V to [FW] or [RV]
terminal, if configured.
• Has the frequency setting for F001
been set greater than zero?
• Are the control circuit terminals [H],
[O], and [L] connected to the potenti-
ometer?
• Set the parameter for F001 to a
safe, non-zero value.
• If the potentiometer is the
frequency setting source, verify
voltage at [O] > 0V.
• Is the RS (reset) function or FRS (free-
run stop) function ON?
• Turn OFF the command(s).
Inverter outputs
U, V, W are
supplying voltage.
• Is the motor load too heavy? • Reduce load or test the motor
independently of the load.
The direction of the motor is
reversed.
• Are the connections of output termi-
nals [U/T1], [V/T2], and [W/T3]
correct?
• Is the phase sequence of the motor
forward or reverse with respect to
[U/T1],[V/T2], and [W/T3]?
• Make connections according to
the phase sequence of the
motor. In general:
FWD = U-V-W, and REV=U-
W-V.
• Are the control terminals [FW] and
[RV] wired correctly?
• Is parameter F004 properly set?
• Use terminal [FW] for forward,
and [RV] for reverse.
• Set motor direction in F004.