Omron EasySpeed 3G3JE, Руководство пользователя

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Chapter 4
4-9
Maintenance Operations
The motor only rotates in one direction.
The motor is rotating in the wrong direction.
The motor is burning out.
Problem Probable cause Correction
Reverse rotation prohi-
bition is selected. If P13 (reverse rotation prohibit
selection) is set to FWD (prohibit
reverse operation), the Inverter
will not accept reverse-rotation
commands. To use both forward and reverse rotation, set
P13 to “F.R.”
Problem Probable cause Correction
The output wiring of the
motor is faulty. The U/T1, V/T2, and W/T3 termi-
nals of the Inverter are not prop-
erly connected to the U, V and W
terminals of the motor. When the U/T1, V/T2, and W/T3 terminals of
the Inverter are properly connected to the U, V
and W terminals of the motor, the motor will
operate in a forward direction when a forward
rotation command is executed. The forward
direction depends on the manufacturer and the
motor type. Therefore, be sure to check the
specifications.Switching two wires among the
U/T1, V/T2, and W/T3 will reverse the direction
of rotation.
Problem Probable cause Correction
The load is too big. If the load of the motor is too big
and the motor is used with the
effective torque exceeding the
rated torque of the motor, the
motor will burn out. Reduce the load amount by either reducing the
load or lengthening the acceleration/decelera-
tion time. Also consider increasing the motor
capacity.
Note: For example, the rated torque of the
motor and capacity may be limited to eight
hours of use if the inscription on the motor
states that the motor is rated for eight hours. If
the 8-hour rated torque is used for normal
operation, it may cause the motor to burn out.
The ambient tempera-
ture is too high The rating of the motor is deter-
mined within a particular ambient
operating temperature range. The
motor will burn out if it runs con-
tinuously at the rated torque in an
environment in which the maxi-
mum ambient operating tempera-
ture is exceeded. Lower the ambient temperature of the motor to
within the acceptable ambient operating tem-
perature range.
The withstand voltage
between the phases of
the motor is insufficient. When the motor is connected to
the output of the Inverter, a surge
will be generated between the
switching of the Inverter and the
coil of the motor. Normally, the
maximum surge voltage is
approximately three times the
input power supply voltage of the
Inverter (i.e., approximately 600 V
for 200-V Inverters). Therefore, the dielectric strength of the motor
to be used must be higher than the maximum
surge voltage.