Omron JX-A4004, Руководство пользователя, Страница: 49 / 220

2-25
2-2 Wiring
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•Integrated EMC filter contains Y-capacitors connected to earth. That means the leakage current
from the Y-capacitors may effect on the Earth Leakage Breaker (ELB) at input side. Please refer
to the following table to help selecting ELB. Note that the values are nominal ones only flow via the
capacitor. Leakage current from the motor cable and motor should also be considered when
selecting the ELB. Actual value may be different depending on your system.
The values are almost proportional to the input voltage.
•As user you must ensure that the HF (high frequency) impedance between adjustable frequency
inverter, filter, and ground is as small as possible.
•Ensure that the connections are metallic and have the largest possible contact areas (zinc-
plated mounting plates).
•Avoid conductor loops that act like antennas, especially loops that encompass large areas.
•Avoid unnecessary conductor loops.
•Avoid parallel arrangement of low-level signal wiring and power-carrying or noise-prone
conductors.
•Use shielded wiring for the motor cable and all analog and digital control lines.
•Allow the effective shield area of these lines to remain as large as possible; i.e., do not strip
away the shield (screen) further away from the cable end than absolutely necessary.
•With integrated systems (for example, when the adjustable frequency inverter is
communicating with some type of supervisory controller or host computer in the same
control cabinet and they are connected at the same PE-potential), connect the
shields of the control lines to PE (protective earth) at both ends. With distributed
systems (for example the communicating supervisory controller or host computer is not in
the same control cabinet and there is a distance between the systems), we recommend
connecting the shield of the control lines only at the end connecting to the adjustable
frequency inverter. If possible, route the other end of the control lines directly to the cable
entry section of the supervisory controller or host computer. The shield conductor of the
motor cables always must connected to PE at both ends.
•To achieve a large area contact between shield and PE-potential, use a PG screw
with a metallic shell, or use a metallic mounting clip.
•Use only cable with braided, tinned copper mesh shield (type “CY”) with 85% coverage.
•The shielding continuity should not be broken at any point in the cable. If the use of reactors,
contactors, terminals, or safety switches in the motor output is necessary, the unshielded
section should be kept as short as possible.
•Some motors have a rubber gasket between terminal box and motor housing. Very often,
the terminal boxes, and particularly the threads for the metal PG screw connections, are
painted. Make sure there is always a good metallic connection between the shielding of the
motor cable, the metal PG screw connection, the terminal box, and the motor housing. If
necessary, carefully remove paint between conducting surfaces.
Model
Earth leakage current @50Hz 200V [mA rms]
Neutral point earthed One phase earthed
JX-AB002~AB004-F 4.2 -
JX-AB007~AB022-F 8.3 -
Model
Earth leakage current @50Hz 400V [mA rms]
Neutral point earthed One phase earthed
JX-A4004~A4040-F 3.6 8.7
JX-A4055~A4075-F 35.7 80.4