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6. TROUBLESHOOTING
6-7
6
6.2 Motor operation out of ordinary
If any of the following faults has occurred in the motor, find out its cause and take adequate measures.
Event Check Point
Estimated Cause (
)
and
Corrective Action (
•
)
Check the main
circuit.
A normal power supply voltage is not applied.
The jumper across terminals R1-S1 has been
disconnected.
The jumper across terminals P/+-P1 has been
disconnected.
The motor is not wired properly.
The switch connected between the motor and drive
unit is open.
Check the control
signals.
The start signal has not been initiated.
Both the forward and reverse rotation signals are
input.
The speed setting signal is not input.
The AU signal is not ON for the 4 to 20mA speed
setting signal.
The MRS signal remains ON.
Check the
parameter settings.
The reverse rotation prevention, Pr. 78 [Section
8.5.1], value has been set.
The operation mode, Pr. 79 [Section 8.2], setting is
incorrect.
0 was set as the maximum speed, Pr. 1 [Section
8.5.1], value.
Check the load.
The load is too heavy.
(The alarm message OL appears.)
The motor shaft is locked.
Motor remains
stopped.
Others
The alarm lamp is lit.
The POWER lamp is off.
The capacities of the drive unit and motor do not
match.
Check the main
circuit.
The wiring of the motor connection terminals U, V, W
does not match the motor phase sequence.
Motor rotates in
opposite direction.
Check the control
signals.
The wiring of the forward rotation signal (terminal
STF) and that of the reverse rotation signal (terminal
STR) was exchanged.
Check the control
signals.
The speed setting signal differs from the setting.
The speed setting signal is compounded with noise.
Speed differs from
the setting.
Check the
parameter settings.
The speed signal bias/gain, Pr. 902 to 905 [Section
8.3.1], values have been set.
The maximum speed, Pr. 1 [Section 8.5.1], value or
minimum speed, Pr. 2 [Section 8.5.1], value has
been set.
The stall prevention function, Pr. 22 [Section 8.5.6]
was activated.
•
Increase the acceleration or deceleration time
setting.
•
Reduce the load.
Acceleration/
deceleration is not
smooth.
Check the
parameter settings.
The stall prevention function, Pr. 22 [Section 8.5.6]
was activated.
•
Increase the acceleration or deceleration time
setting.
•
Reduce the load.
Check the control
signals.
The speed setting signal varies.
Speed varies.
Check the load.
The load varies.
At start, motor
shaft runs in
opposite direction
instantaneously.
Check the
parameter settings.
The acceleration time setting is more than that for the
maximum permissible starting torque.
•
Increase the acceleration time setting.