Delta EB3000 Series User Manual page 468

A-5-2 Harmonic Interference
The AC motor drive's input current is non-linear, the input rectifier generates harmonics. Harmonics
must be limited to within a certain range to avoid impact the mains power and to avoid current
distortion to ensure surrounding devices are not influenced. An AC Motor Drive with built-in DC reactor
suppresses harmonic currents (Total Harmonic Current Distortion THID) effectively and therefore
reduces the harmonic voltage peaks (Total Harmonic Voltage Distortion).
Harmonic Current at the Power Supply Side
Suppression of Harmonic Currents
When a large portion of lower order harmonic currents (5
surrounding devices will be disturbed and the power factor will be low as a result of reactive power.
Installing a reactor at the AC Motor Drive's input effectively suppresses lower order harmonic currents.
(A) Fund amen tal Sin e Wa ve
(6 0Hz)
(B) 3 r d Ha rmo nic
(1 80H z)
(C) H armo nica lly
Di sto rte d Wa ve
Figure A-27
Figure A-28
A-21
Appendix A. EMC Standard Installation GuideEB3000
, 7 , 11 etc.) occur at the power input,
th th th ,
(A) Fund amen tal Sin e Wa ve
(6 0Hz)
(B) 5 th Ha rmon ic
(3 00H z)
(C) H armo ni ca lly
Di sto rted Wa ve