日立WJ200变频器使用与维护指南
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更新于2024-07-23
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日立变频器WJ200中文说明书详细介绍了日立公司推出的WJ200系列变频器的使用和维护指南。这份文档针对NT323Z型号，针对潜在用户提供了重要的操作指导，强调了在购买、安装、运行和维护过程中必须遵循的安全、电磁兼容性和UL/cUL认证等相关注意事项。
1. 安全上注意事项是手册的首要部分，确保用户在操作过程中避免可能的电气风险和人身伤害，包括但不限于正确接地、避免触电，以及遵守设备的额定电压和电流限制。
2. EMC（电磁兼容性）相关注意事项提醒用户注意变频器可能产生的电磁干扰，以及如何在电磁兼容环境中合理配置和使用，以减少对周围电子设备的影响。
3. UL/cUL相关注意事项表明该变频器符合美国和加拿大安全标准，用户需了解并遵循这些标准，确保设备在特定区域内的合法使用和合规性。
2.1 购买时的检查部分涵盖了初步验证变频器质量的步骤，包括检查包装完整性、确认产品型号、核实配件清单等，以确保购买到的产品是全新且功能正常的。
手册强调了在使用过程中，不仅要依赖本说明书，还应结合与变频器相关的选件产品操作手册，因为它们可能各自有不同的使用规范。同时，为了保障最终用户的权益，务必确保所有相关文档都送达用户手中，并且在阅读完毕后妥善保管。
用户应该意识到，手册中的内容可能随时间更新，因此在使用时要注意查看修订记录表，以便获取最新的信息和可能的更新。此外，手册还要求用户不得擅自复制或公开传播其内容，如发现错误或不清楚之处，应直接联系制造商寻求解答。
这份WJ200系列变频器的使用说明书是专业技术人员和用户进行设备操作和维护的重要参考资源，它旨在提供详尽的指导，确保用户能够安全、有效地使用日立的变频器产品。
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1 章 安全注意事项
1章
Important notes
1. Input choke or other equipment is required if necessary to comply with EMC directive from the harmonic
distortion point of view (IEC 61000-3-2 and 4).
2. If the motor cable length exceeds 20m, use output choke to avoid unexpected problem due to the leakage
current from the motor cable (such as malfunction of the thermal relay, vibration of the motor, etc..).
3. 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).
4. 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.
5. 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 ground + PE-potential), connect the shields of the control lines to ground + 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 ground + PE at both ends.
• To achieve a large area contact between shield and ground + 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.
6. Take measures to minimize interference that is frequently coupled in through installation cables.
• Separate interfering cables with 0.25m minimum from cables susceptible to interference. A
particularly critical point is laying parallel cables over longer distances. If two cables intersect (one
crosses over the other), the interference is smallest if they intersect at an angle of 90°. Cables
susceptible to interference should therefore only intersect motor cables, intermediate circuit cables, or
the wiring of a rheostat at right angles and never be laid parallel to them over longer distances.
7. Minimize the distance between an interference source and an interference sink (interference- threatened
device), thereby decreasing the effect of the emitted interference on the interference sink.
• You should use only interference-free devices and maintain a minimum distance of 0.25 m from the
adjustable frequency inverter.
8. Follow safety measures in the filter installation.
• If using external EMC filter, ensure that the ground terminal (PE) of the filter is properly connected
to the ground terminal of the adjustable frequency inverter. An HF ground connection via metal
contact between the housings of the filter and the adjustable frequency inverter, or solely via cable
shield, is not permitted as a protective conductor connection. The filter must be solidly and
permanently connected with the ground potential so as to preclude the danger of electric shock upon
touching the filter if a fault occurs.
To achieve a protective ground connection for the filter:
• Ground the filter with a conductor of at least 10 mm
2
cross-sectional area.
• Connect a second grounding conductor, using a separate grounding terminal parallel to the
protective conductor. (The cross section of each single protective conductor terminal must be sized
for the required nominal load.)
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