Inovance MD500T75G - Page 320

13. EMC MD500 User Manual
- 320 -
6ROXWLRQVWR&RPPRQ(0&,QWHUIHUHQFH3UREOHPV
The AC drive generates very strong interference. Although EMC measures are taken, the interference may still exist due to
improper cabling or grounding during use. When the AC drive interferes with other devices, adopt the following solutions.
Interference Type Solution
Leakage protection
switch tripping
ƕ Reduce the carrier frequency.
ƕ Shorten the length of the AC drive cables.
ƕ Wind magnetic ring around the drive input cable except the PE cable.
ƕ For tripping at the moment of power-on, cut off the large capacitance to ground on the
SRZHULQSXWVLGHE\GLVFRQQHFWLQJWKHJURXQGLQJWHUPLQDORIWKHH[WHUQDORUEXLOWLQÀOWHUDQG
disconnecting the grounding terminal of the Y capacitance to ground of the input terminals .
ƕ For tripping during drive running or when drive enabled, take leakage current suppression measures
LQVWDOODOHDNDJHFXUUHQWÀOWHULQVWDOOVDIHW\FDSDFLWRUZLQGPDJQHWLFULQJZLQGPDJQHWLFULQJ
AC drive interference
during running
ƕ Connect the motor housing to the PE of the AC drive.
ƕ Connect the PE of the AC drive to the PE of the line voltage.
ƕ Wind the power input cable with magnetic ring.
ƕ Add a safety capacitor or magnetic ring to the interfered signal terminal.
ƕ Add an extra common ground.
Communication
interference
ƕ Connect the motor housing to the PE of the AC drive.
ƕ Connect the PE of the AC drive to the PE of the mains voltage.
ƕ Wind the power input cable with magnetic rings.
ƕ Add a matching resistor between the communication cable source and the load side.
ƕ Add a common grounding cable besides the communication cable.
ƕ Use a shielded cable as the communication cable and connect
the cable shield to the common grounding point.
ƕ Adopt daisy chain mode for multi-node communication and reserve branch length of less than 30 cm.
,2LQWHUIHUHQFH
ƕ Enlarge the capacitance at the low-speed DI. A maximum of 0.11 uF capacitance is suggested.
ƕ Enlarge the capacitance at the AI. A maximum of 0.22 uF is suggested.
efesotomasyon.com