SJ700
2
Inverter
T
roub
leshooting
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
E--.-
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 P24 (via switch, etc.)
•
Verify the terminal functions for
C001 - C008 are correct.
•
Turn ON Run command enable.
•
Supply 24V to [FW] or [RV] termi-
nal, 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.