Service manual

www.enc.net.cn/en Tel/Fax:[phone] installation and wiring
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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 R, S, T, 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 (R, S, T 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 layer
close-to–inverter side earthed after connected with PE terminal of inverter.
(4) Cable educed from inverter PE terminal must be connected directly to
earth-plate and can’t be connected to ground through grounding wire of other
devices.
(5) Powerful cable(R, S, T, U, V, W)should not parallel control signal cable
closely, say nothing of being bundled together, must keep distance of 20~60cm
above (related to size of powerful current). Should cross each other vertically if
intersection, as Fig.3-20.
(6) Powerful grounding wire must be connected to earth separately from weak
grounding cable such as control signal and sensor cable etc.
(7) Forbid to connect other electricity consumption device to inverter power
supply input end(R, S, T).
3.7.3 Relation of long-distance wiring and current leak and the
countermeasure
High-order harmonic will form between-line leak current through distributing
capacitor and to-earth leak current when long-distance wiring between inverter
and motor commence. Can adopt following method to suppress:
(1) install ferrite magnetic circle or output reactor at inverter output side.
(2) Reduce carrier wave frequency but motor noise would increase accordingly.
3.7.4 Installation demand for electromagnetic on-off electronic device
Relay，magnetic control conductor and electromagnetic iron and so on,
Power supply wire or
motor cable
Control signal cable
Fig.3-20 system wiring demand
End voltage of the motor will be reduced markedly when installing reactor of 5%
above rated voltage dropn and make long-distance wiring to U, V, W. Fully loaded
motor have the danger of burning itself，should work in lower volume or step up its
in
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ut out
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ut volta
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