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Troubleshooting Tips
The table below lists typical symptoms and the corresponding solution(s).
Symptom/condition Probable Cause Solution
• 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
[L1], [L2], and [L3/N]? If so, the
POWER lamp should be ON.
• Check terminals [L1], [L2],
and [L3/N], then [U/T1],
[V/T2], and [W/T3].
• Turn ON the power supply or
check fuses.
• Is there an error code
E X X
displayed?
• Press the Func. key and
determine 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 [PCS] (via switch, etc.)
• Verify the terminal functions
for C001–C005 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
potentiometer?
• Set the parameter for F001 to
a safe, non-zero value.
• If the potentiometer is the
frequency setting source,
verify voltage at [O] > 0V.
The inverter
outputs [U], [V],
[W] are not
supplying
voltage
• 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 the load, and test the
motor independently.
The motor
will not run
The optional
remote
operator is
used (SRW).
• Are the operational settings
between the remote operator and
the inverter unit correct?
• Check the operator type
setting.
• Are the connections of output
terminals [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.
The direction of the motor is
reversed
• 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.
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Troubleshooting and
Maintenance