2-14
2-15
– Mount the drive onto the metal board and
connect the whole board to ground.
– Connect a noise filter to the drive power wires.
3) When implementing measures against noise gener-
ated from peripheral equipment:
– For the control circuit wires, use twisted or
shielded-twisted wires. If using shielded-twisted
wires, connect the shield of the shielded wires
to the common terminals of the control circuit.
– Connect a surge absorber in parallel with the
coil or solenoid of the magnetic contactor.
(3) Leakage current
Harmonic component current generated by transistors
(IGBT) in the drive switching ON/OFF becomes leakage
current through stray capacitance of the drive input and
output wires or the motor. If any of the problems listed
below occur, take appropriate measures against them.
Table 2.5 Leakage Current Countermeasures
Problem
Measures
A ground fault circuit interrupter* (GFCI) that is
connected to the power supply has isolated the drive
from the power supply.
Decrease the carrier frequency.
2) Make the wires between the drive and motor shorter.
3) Use a less sensitive ground fault circuit interrupter.
4) Use a ground fault circuit interrupter that includes protection against
harmonic component.
An external thermal relay was activated.
1) Decrease the carrier frequency.
2) Increase thermal time constant.
3) Use the thermal relay built in the drive.
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Содержание Fuji Electric MICRO-SAVER AF-300
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