Delta Electronics AC Motor Drive VFD-EL User Manual page 186

Silicon rectifier and AC motor drive are
connected to the same power.
Correct wiring
power
Used to improve the input power factor, to
reduce harmonics and provide protection from
AC line disturbances. (surges, switching
spikes, short interruptions, etc.). The AC line
reactor should be installed when the power
supply capacity is 500kVA or more and
exceeds 6 times the inverter capacity, or the
mains wiring distance
Correct wiring
large-capacity
power
Revision August 2008, 2ELE, V1.02
Application 2
reactor
reactor
Application 3
≤
10m.
reactor
Appendix B Accessories|
Question
Switching spikes will be generated when the
silicon rectifier switches on/off. These spikes
may damage the mains circuit.
Silicon Controlled Rectifier
AC motor drive
Question
When the mains power capacity is too large,
line impedance will be small and the charge
current will be too high. This may damage AC
motor drive due to higher rectifier
temperature.
small-capacity
AC motor drive
DC
motor
motor
B-11