Wiring issues with Siemens valve positioners
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I connected 3 and 8, and shorted 56; when I connected a 24V power supply, the LCD screen lit up, but it went out after a few seconds, and there was a burnt smell – it’s likely that something was burned. Why?
Connect 3 and 8, and short 56. The wiring in a two-wire system is correct as you said, but what do you mean by connecting to a 24V power supply? It should be connected to the AO channel of the DCS. If, as you say, a 24V power supply is connected, the current will be too high and this will damage the meter.
It indeed should be powered by the DCS safety barrier; I thought I would connect it first to give it a try, but I forgot about that
This place has a musty smell. . .
A few thousand dollars gone – the board is useless, but the other components can be used as spare parts.
It’s a fundamental basic mistake – a two-wire system can only handle 4-20mA signals; the voltage is around 5V. It’s impossible for there to be no voltage applied
This one. . . There’s no such thing as a device that accepts 24V; what’s connected are signal generators