Toshiba Q9 Plus ASD, Installation & Operation Manual

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E6581611
A-24
1
1.4.2 Inverters
Protecting inverters from overcurrent
The inverter has an overcurrent protection function. The programmed current level is set to the
inverter's maximum applicable motor. If the motor used has a small capacity, the overcurrent level and
the electronic thermal protection must be readjusted. If adjustment is necessary, refer to section 5.6,
and make adjustments as directed.
Inverter capacity
Do not use a small-capacity (kVA) inverter to control the operation of a large-capacity motor (two-class
or more larger motor), no matter how light the load is. Current ripple will raise the output peak current
making it easier to set off the overcurrent trip.
Power factor correction capacitor
Power factor correction capacitors cannot be installed on the output side of the inverter. When a motor
is run that has a power factor correction capacitor attached to it, remove the capacitors. This can cause
inverter malfunction and capacitor destruction.
Remove the power factor correction
capacitor and surge absorber
Power factor correction capacitor
U/T1
V/T2
W/T3
Inverter
M
Operating at other than rated voltage
Connections to voltages other than the rated voltage described in the rating label cannot be made. If a
connection must be made to a power supply other than one with rated voltage, use a transformer to
raise or lower the voltage to the rated voltage.