Inverters - Toshiba TOSVERT VF-AS1 Instruction Manual

1.5.2 Inverters

Power supply voltage
VFAS1-5015PM to 5075PM cannot be applied to input voltage 690V.
It is necessary to change the parameter setting according to the power supply voltage ( 500/600/690V ).
In case of VFAS1-5015PM to 5075PM
Power supply Three-phase-500V:  = 
Power supply Three-phase-600V:  =  (default setting)
In case of VFAS1-6022PL to 6630KPC
Power supply Three-phase-500V:  = 
Power supply Three-phase-600V:  =  (default setting)
Power supply Three-phase-690V:  = 
When this parameter setting is mistaken, a motor can not be driven smoothly.
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 stall prevention level, overcurrent level and the motor
electronic thermal protection must be readjusted. If adjustment is necessary, refer to Section 5.14, and make
adjustments as directed.
Inverter capacity
Do not operate a large capacity motor with a small capacity (kVA) inverter even with light loads. 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
trips and capacitor destruction.
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.
Circuit interrupting when two or more inverters are used on the same power line.
There is no fuse in the inverter's main circuit. Thus, as the diagram above shows, when more than one inverter is
used on the same power line, you must select interrupting characteristics so that only the MCCB2 will trip and the
MCCB1 will not trip when a short occurs in the inverter (INV1). When you cannot select the proper characteristics
install a circuit interrupting fuse between the MCCB2 and the INV1.
U
Inverter
V
W
Power factor correction
MCCB1 MCCB2
MCCB3
MCCBn
Breaking of selected inverter
A-21
IM
Remove the power factor
correction capacitor and surge
absorber
(Circuit interrupting fuse)
INV1
INV2
INVn
E6581528
1