Locale Wiring And Earthing - SHENZHEN ENCOM ELECTRIC TECHNOLOGIES CO. enc eds800-2s0002n User Manual

When grounding wire of peripheral device and wiring of the inverter compose closed-loop, inverter
①
grounding wire leakage current would make the device do wrong action. Can reduce wrong action if
the device is not earthed here.
High-order harmonic from the inverter would make voltage and current transmit through power
supply wire when peripheral device and the inverter electrified by same power supply, would disturb
other devices in this same power supply system，can take following suppressing measure: assemble
②
electromagnetic noise filter at inverter input end；isolate other devices by isolation transformer;
connect power supply for peripheral device with remote power source; install ferrite filter magnetic
circle for L1, L2, L3 three-phase conducting wire of the inverter to suppress conduction of
high-frequency harmonic current.
Keep device and signal wire prone to disturbance from the inverter. Should use shielded signal
wire, shielding layer single end earthed and try best to keep away from the inverter and its input,
output wire. If signal wire must intersect strong power cable, must keep them in real intersection and
avoid parallel.
Install high-frequency noise filter(ferrite common module choke, folksay magnetic circle)
③④⑤
separately at input, output root，which can effectively suppress emission disturbance from dynamic
wire.
Should place motor cable shield of biggish thickness, for instance set it in tube with biggish
thickness (above 2mm) or bury it in cement slot. Dynamic wire set into metal tube and use shielding
wire to be grounded (use 4-core motor cable, one side is earthed through the inverter, the other side
connected to motor shell).
To prevent parallel or bundled power and weak conducting wire；should keep away from inverter
mounted device to the best and its wiring should keep away from power wire of the inverter such as
⑥⑦⑧
L1, L2, L3, U, V, W etc.. Should pay attention to relative mounting place between device with strong
electric field or strong magnetic field and the inverter, should keep distance and vertical intersection.
3.7.2 Local wiring and earthing
(1) Avoid parallel cable from inverter to motor (U, V, W terminal education wire) and power
supply wire (L1, L2, L3 terminal input wire). Should keep distance of 30cm above.
(2) Try your best to place motor table from U, V, W
terminals in metal tube or metal wiring slot.
(3) Should use shielded cable as common control
signal cable，shielding layerclose-to–inverter side
earthed after connected with
(4) Cable educed from inverter
and can't be connected to ground through grounding wire of other devices.
(5) Powerful cable(L1, L2, L3, U, V, W)should not parallel control signal cable
closely, say nothing of being bundled together, must keep distance of 20~60cm
EDS800 series Service Manual
terminal of inverter.
terminal must be connected directly to earth-plate
22
Power supply wire or
motor cable
Control signal cable
Fig.3-16 system wiring demand