Inverter L300P Hitachi

Well, as evidenced by my increase in the issue positions (vs answer my other posts), I get down to the wire trying to get a new operating system. I'm controlling a Hitachi L300P inverter (motor controller), via its RS485 link. I have, at the end of the computer, a usb to RS485 adapter, and the race to the L300P made by a short, twisted pair (60 feet max) runs (the controller is configured for "Half duplex, two sons"). When I send a message to the unit I get no response, the purpose, or a message ACK or NAK. I tested my port by connecting a second and "talking to myself", performed the L300P self back loop, which is to unplug the external connection and do manual things through its programming before Panel and have, while the cable was disconnected tested its continuity. This morning I intend on executing the second long twisted of the location of the computer for controllers and make one end to end test to confirm I can talk down the wires. I'm sure that my chain of command is correct, but do think the device is supposed to send an ACK or NAK if it "sees" something coming.

If there is anyone who has had experience with these discs, either through LabVIEW or not, I would be grateful hearing on their part. Also all other paths to solve this are appreciated. I'm more tired, mentally and physically, and another set of "eyes" looking at the problem will probably help.

Well, to help anyone with similar problems, I'll say what I found. As mentioned in previous posts, I had ran 150' cable out to the fine disc and connected to the other end of the cable comm existing on the disc, the near end of another adapter USB-RS485 (Easysync ES-U-3001-M). When it worked, I thought it turned out that the problem is not hardware but whatever my software (doubtful, the sent string implementation match the example in the manual) or a problem of disk configuration. While I was talking to 'Sam' to Hitachi, I found that once I sent the order message I received a returned "ACK" message. Hmmm! ?? Well, the USB adapter, I, designed to be used as RE232, 422 or 485, has a number of configuration inside bars, which allow the addition of 750 ohms pullups and pulldowns and 120 ohm termination resistors to some signals. I activated the and "Bam!" the reader begins to see and responding to my messages. Apparently, the cards have a more sensitive front end that are matched to the car, or at least (reasonable) to communicate successfully more than ~ 300 feet of twisted out of the box configuration, pair but the necessary drive configuration changes. Still have a big headache (a real one) and I now talk to other Hitachi drive, which uses Modbus rather than the simple protocol of this player.

Thanks again for the support, it can feel pretty lonely here with you people!

Tags: NI Software

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