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(2) Wiring
CAUTION
Do not fit capacitive equipment such as power factor correction capacitor, radio
noise filter or surge suppressor to the output of the inverter.
The connection orientation of the output cables U, V, W to the motor will affect
the direction of rotation of the motor.
(3) Trial run
CAUTION
Check all parameters, and ensure that the machine will not be damaged by a
sudden start-up.
When the load GD
2
is small (at the motor GD
2
or smaller) for 400V from 1.5K to
3.7K, the output current may vary when the output frequency is in the 20Hz to
30Hz range.
If this is a problem, set the Pr. 72 "PWM frecuency selection" to 6kHz or higher.
When setting the PWM to a higher frequency, check for noise or leakage current
problem and take countermeasures against it.
(4) Operation
WARNING
When you have chosen the retry function, stay away from the equipment as it will
restart suddenly after an alarm stop.
The [STOP] key is valid only when the appropriate function setting has been
made. Prepare an emergency stop switch separately.
Make sure that the start signal is off before resetting the inverter alarm. A failure
to do so may restart the motor suddenly.
The load used should be a three-phase induction motor only. Connection of any
other electrical equipment to the inverter output may damage the equipment.
Do not modify the equipment.
CAUTION
The electronic overcurrent protection does not guarantee protection of the motor
from overheating.
Do not use a magnetic contactor on the inverter input for frequent
starting/stopping of the inverter.
Use a noise filter to reduce the effect of electromagnetic interference. Otherwise
nearby electronic equipment may be affected.
Take measures to suppress harmonics. Otherwise power harmonics from the
inverter may heat/damage the power capacitor and generator.
When a 400V class motor is inverter-driven, it should be insulation-enhanced or
surge voltages suppressed. Surge voltages attributable to the wiring constants
may occur at the motor terminals, deteriorating the insulation of the motor.
When parameter clear or all clear is performed, each parameter returns to the
factory setting. Re-set the required parameters before starting operation.
The inverter can be easily set for high-speed operation. Before changing its
setting, fully examine the performances of the motor and machine.
In addition to the inverter's holding function, install a holding device to ensure
safety.
Before running an inverter which had been stored for a long period, always
perform inspection and test operation.