milmat1
Member
Trying to troubleshoot a new installation using a AB PF525 vfd with 25-enc-1 encoder card. Encoder is a DYNAPAR H20 series, This is one of several axis' on this machine, others are working correctly.
counts are acting strange when viewed in RS LOGIX 5000. In fwd direction it seems to gain counts, in reverse it seems to loose counts. And never returns to 0 when back at home position. Voltage on "A" and "B" are at 4.75vdc. (Opposite polarity ). Encoder is powered with 24vdc.
I want to look at the signals with a scope, I have a 2 channel old B&K CRT scope. Im not sure how to connect the probes ?
should the probe be connected to "A" and "A _" for ex. Or to "A" and ground ?
and of course the same for "B" channel....
the cabling is an igus shielded twisted pairs cable and the A and B channels are on pairs.
shield grounded at the vfd and cut / stored on encoder end....as usual...
counts are acting strange when viewed in RS LOGIX 5000. In fwd direction it seems to gain counts, in reverse it seems to loose counts. And never returns to 0 when back at home position. Voltage on "A" and "B" are at 4.75vdc. (Opposite polarity ). Encoder is powered with 24vdc.
I want to look at the signals with a scope, I have a 2 channel old B&K CRT scope. Im not sure how to connect the probes ?
should the probe be connected to "A" and "A _" for ex. Or to "A" and ground ?
and of course the same for "B" channel....
the cabling is an igus shielded twisted pairs cable and the A and B channels are on pairs.
shield grounded at the vfd and cut / stored on encoder end....as usual...