Appendix
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12
A.1.9 Solutions to Common EMC Interference Problems
AC drive generates very strong interference. Although EMC measures are taken, interference
may still exist due to improper cabling or grounding during use. When AC drive interferes with
other devices, adopt the following solutions.
Interference Type
Solution
Leakage
protection switch
tripping
Ɣ
Reduce carrier frequency.
Ɣ
Shorten length of the AC drive cables.
Ɣ
Wind ferrite core around the drive input cable except PE cable.
Ɣ
For tripping at the moment of power-on, cut off the large capacitance
to ground on power input side by disconnecting grounding terminal
RIH[WHUQDORUEXLOWLQ¿OWHUDQGGLVFRQQHFWLQJJURXQGLQJWHUPLQDORI<
capacitance to ground of input terminals.
Ɣ
For tripping during drive running or when drive enabled, take leakage
FXUUHQWVXSSUHVVLRQPHDVXUHVLQVWDOODOHDNDJHFXUUHQW¿OWHULQVWDOO
safety cap wind ferrite core).
AC drive
interference
during running
Ɣ
Connect motor housing to PE of AC drive.
Ɣ
Connect PE of AC drive to PE of grid.
Ɣ
Wind power input cable with ferrite core.
Ɣ
Add a safety capacitor or ferrite core to interfered signal terminal.
Ɣ
Add an extra common ground.
Communication
interference
Ɣ
Connect motor housing to PE of AC drive
.
Ɣ
Connect PE of AC drive to PE of grid.
Ɣ
Wind power input cable with ferrite cores.
Ɣ
Add a matching resistor between communication cable source and load.
Ɣ
Add a common grounding cable besides communication cable.
Ɣ
Use a shielded cable as communication cable and connect cable shield to
common grounding point.
Ɣ
Adopt daisy chain mode for multi-node communication and reserve
branch length of less than 30 cm.
I/O interference
Ɣ
Enlarge capacitance at low-speed DI. A maximum of 0.11 uF capacitance
is suggested.
Ɣ
Enlarge capacitance at AI. A maximum of 0.22 uF is suggested.
Summary of Contents for MD290 Series
Page 1: ......
Page 79: ...3 Electrical Installation 78 3 ...
Page 80: ...4 Operating Panel Keypad Display 4 1 Introduction 80 4 2 Inbuilt LED Operating Panel 80 ...
Page 92: ...5 Quick Setup 5 1 Get Familiar With Operating Panel 92 5 2 Setup Flowchart 93 ...
Page 227: ...7 Interfaces and Communication 226 7 ...
Page 285: ...10 Troubleshooting 284 11 ...
Page 349: ......
Page 350: ......