PowerFlex 700 Not Seeing Digital Inputs

I have a new PowerFlex 700 that I have a 3 wire control circuit,
hooked up, with a external 24 vdc. I have the following:
Term. 27 Stop Signal High
Term. 28 Start Signal Low
Term. 29 Auto/Manual Signal Low
Term. 25 Common Test Good

The problem that I think I am having is the drive does not reconize
the Stop Input , because I keep getting a Stop Asserted at the top of the screen. I do not see none of the bits changing in the Dig In Status screen 000000 .What could I be overlooking.

Thanks in advance,again.

From off the top of my head, if I remember correctly, 'Stop Asserted' on the drive means your 'enable' contact is not closed. Install a jumper across the enable terminals, and you should be able to run it.

That would be term. 27 right? Unless there is another Term.

that I am missing.

You'll need to go through the diagnostics files and find the STOP OWNER. Something is issuing a stop command and that will tell you what it is. Right now, I don't have any of the books with me, but they'll tell you which parameter and which bit means what device... Could be the enable contact. Could be that it's for some reason looking at a devicenet or controlnet or ethernet device that's holding it off...

Coachman said:

That would be term. 27 right? Unless there is another Term.

that I am missing.

Click to expand...

That would depend on how you have defined your terminals -- they can be user-defined. You'll have to look at the parameters. Unless they're "default", it's hard to guess how the terminals are defined.

I agree with OZEE. You will need to go through the manual. I am almost positive 'Stop Asserted' is for the enable. I just did a project with six Powerflex40 drives,and I distinctly remember that when I hit the E-Stop, which dropped out my drive enables. the drives would show 'Stop Asserted'. When the drives were stopped by normal 'stop' command, the drives would show 'Stopped'. I was using Remote I/O to the drives, with hardwire enable.

Read the manual with relation to drive enable, and you should find a solution. Wish I had time to dig in further for you.

Your thinking is correct; if the input signal to Terminal 27 (Stop-CF) is not being recognized by the PowerFlex 700, then you won't see a "1" in the corresponding bit in the Discrete Input parameter, and you will see a "Stop Asserted" indication on the HIM module.

Which is exactly what's going on.

So let's examine your wiring. Most discrete wiring to the PowerFlex 700 uses the onboard +24VDC supply (Terminal 24) and jumpers the onboard 24VDC common (Terminal 26) to the Discrete Inputs common (Terminal 25).

Since you are using an external 24VDC supply, you need to connect your external DC Common to Terminal 25.

what if I had the same problem but the drive is controlled via ProfiBus protocol??