Deltauuaiqy (Gast)
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Вылезла error f117 на частотнике CFW-090105TGDBZ. Похожие приборы ATV312HU15S6, CIMRJ7AZ24P00, CFW100016SDPLZ на насосах работают.
Расшифровку нашел в яндексе по запросу "Ремонт частотного преобразователя Altivar ATV61 Plus atv61exc2с40n4" prom-electric.ru/articles/1/594/ . Вышел из строя модуль семикрон.
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Deltatpaqtr (Gast)
| | minimum. Most RS-485 drivers can source and sink 60 mA and thus will work with 100Q cable and terminations. But a cable with 120Q or greater characteristic impedance is a better choice for most RS-485 lines. Shielding Metal shielding is effective at blocking noise due to capacitive, electromagnetic, and high-frequency magnetic coupling. The shielding is typically grounded at one end only. If the line has a single power source, the shield ground is at this node. Many RS-485 lines don’t require shielded cable. Connectors Unlike RS-232, the RS-485 standard doesn’t specify a connector, signal functions, or pin assignments. Many links use RJ-type modular connectors described in Chapter 5 . On any connector, keep the two signal wires A and B next to each other. The two differential lines for each signal should be in the same twisted pair. Also be careful not to transpose the wires: all of the drivers’ and receivers’ A pins should connect to one wire, and all of the B pins, to the other. Grounds and Differential Lines An RS-485 line can extend for thousands of feet. The differential drivers cause equal and opposite return currents that essentially cancel each other, and thus it may seem that RS-485 has no need for a ground connection at all. With few exceptions, however, the entire line should share a ground connection. Chapter 5 introduced the topics of power supplies, grounding, and isolation. This chapter looks at grounding and isolation as it relates to RS-485 lines, which may extend much farther than RS-232. Ensuring a Common Ground The currents in RS-485 balanced lines are nearly but not exactly equal. The currents differ slightly due to imbalances between the components and noise that isn’t exactly equal in both wires. The current in the ground wire may be very small but isn’t zero. If there is no ground connection, the energy in the return current has to dissipate somehow, possibly as radiated energy that shows up as EMI. 134 Designing RS-485 Links and Networks prom-electric.ru |
