Motor Operation Out Of Ordinary - Mitsubishi Electric MELIPM Series Instruction Manual

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 the main
circuit.
Check the control
signals.
Motor remains
stopped.
Check the
parameter
settings.
Check the load.
Others
Check the main
Motor rotates in circuit.
opposite
Check the control
direction.
signals.
Check the control
signals.
Speed differs
Check the
from the setting.
parameter
settings.
Acceleration/
Check the
deceleration is
parameter
not smooth.
settings.
Check the control
signals.
Speed varies.
Check the load.
At start, motor
shaft runs in
Check the
opposite
parameter
direction
settings.
instantaneously.
Check Point
A normal power supply voltage is not applied.
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.
The start signal has not been initiated.
Both the forward and reverse rotation signals
are input.
The speed setting signal is not input.
The MRS signal remains ON.
The reverse rotation prevention, Pr. 78 [Section
8.5.1], value has been set.
0 was set as the maximum speed, Pr. 1 [Section
8.5.1], value.
The load is too heavy.
(The alarm message OL appears.)
The motor shaft is locked.
The alarm lamp is lit.
The POWER lamp is off.
Terminals PC and SD are shorted.
The wiring of the motor connection terminals U,
V, W does not match the motor phase sequence.
The wiring of the forward rotation signal
(terminal STF) and that of the reverse rotation
signal (terminal STR) was exchanged.
The speed setting signal differs from the setting.
The speed setting signal is compounded with noise.
The speed signal bias/gain, Pr. 902, Pr. 903
[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 was activated.
• Increase the acceleration or deceleration time
setting.
• Reduce the load.
The stall prevention function was activated.
• Increase the acceleration or deceleration time
setting.
• Reduce the load.
The speed setting signal varies.
The load varies.
The acceleration time setting is more than that
for the maximum permissible starting torque.
• Increase the acceleration time setting.
• Reduce the stall prevention operation level in
Pr. 22.
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Possible Cause ( ) and
Corrective Action (•)
6-6
6. TROUBLESHOOTING