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Main circuit terminals
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WIRING
1.2.5 Leakage current and installation of earth (ground)
leakage circuit breaker
Due to static capacitances existing in the inverter I/O wiring and motor, leakage
currents flow through them. Since their values depend on the static capacitances,
carrier frequency, etc., take the following countermeasures.
(1) To-earth (ground) leakage currents
Leakage currents may flow not only into the inverter's own line but also into the
other line through the earth (ground) cable, etc.
These leakage currents may operate earth (ground) leakage circuit breakers and
earth (ground) leakage relays unnecessarily.
Countermeasures
• If the carrier frequency setting is high, decrease the carrier frequency (Pr. 72) of the
inverter.
Note that motor noise increases. Selection of Soft-PWM control (Pr. 70) will make it
unoffending. (Factory setting)
• By using earth leakage circuit breakers designed for harmonic and surge
suppression in the inverter's own line and other line, operation can be performed
with the carrier frequency kept high (with low noise).
REMARKS
When the filter pack is provided, leakage current can be reduced by removing the earth (ground)
cable for the capacitive filter and securing it with the supplied screw for leakage current
countermeasure (plastic) and spacer (plastic). However, the noise reduction effect of the
capacitive filter is lost.
(Pull out the earth (ground) cable for the capacitive filter a little to wire.)
Screw for leakage current countermeasure (plastic)
<Mounting method>
Filter pack
(Tightening torque is 0.35 0.05N m)
Spacer
(plastic)
Earth (Ground) cable for capacitive filter
CAUTION
If the earth (ground) cable for the capacitive filter is removed, it is charged
while power is on or shortly after power off. Do not touch the earth (ground)
cable as you may get an electric shock.