The M710iC is running in auto. The issue was degraded insulation on the RTU brake cable (Grp2 ax1) even though the alarm was Grp1 ax1 and Grp1 ax2.
Posts by robota
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You are getting close, at least according to some new progress. I did not megger the cable since I had new cable virtually from CRR88 to a new harness strung along the outside of the bot.
Turns out that just because the fault comes up Grp1 ax 1 & 2 it could be ANY of the brakes. After swapping and checking all 6 motors - no change.
I have a spare RTU motor (Group2 ax1 !) so decided to check that. No change. Read from the pins on cable at servo amp, it has only two wires, no number that I've found yet, but has a sticker on the cable, "brake". Read all the way through brake coil, all good. Decided to megger the cable with both sides disconnected of course, with initial OK readings. Had a guy at the other end start moving the cable around and the reading started jumping around. Got a new 20m cable over-nighted.
Plugged in new cable yesterday afternoon, no faults. I am in the process of making all the connections normal, pulling out test cables etc. I will update after I run in auto.
Thanks.
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Yes. So I used the ax2 motor I had replaced and plugged in the J1 motor and brake connections. Axes 1 & 2 are the same P/N. If for some wild reason both motors had some odd brake failure simultaneously it would invalidate that test.
I may be able to clamp around the brake wires on the harness although it faults within seconds it may be worth a shot.
The coils on all of the ax1 & 2 motors read approx. 330ohms.
Thank you.
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I have, in pretty logical order, replaced the 14m RM1 cable, ax2 motor, have a new J1-J6 harness strung along the outside and plugged into the NEW RM1 cable and the new (refurb) 6ax servo amp and each motor / brake connection. I can read from CR88 @ servo board the ax1 & ax2 brake coils which are in parallel, ax3 by itself and ax4/5/6 parallel coil values which agree with the independent values I read at the base connector pins originally. The only thing I haven't replaced in that power flow scheme is the original 7m RM1 cable which has been coiled inside an enclosure, dry and never moved. It plugs into a 14m extension which is new. Still, today I opened up the Harting connector to inspect for schmutz, signs of arcing, loose connection - anything. It was pristine.
Still, I get the same brake abnormal faults. Sometimes it takes a minute to come in (after I pull-in deadman) but I don't even need to attempt to move. I have several spare parts now that I've been meaning to order...
Any ideas?
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I have been using 16G and 32G thumb drives on R30iA and iB controllers BUT through the UT1 port ONLY.
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Does anyone know a way to get more than 10 / 20 timers on an R30iA / iB controller?
I attempted to use the indirect method and use a register but it balked at that.Thanks in advance.
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Me again...
I should've added that a typical reason for seeing all those faults occur, especially losing the rev counters plus other faults that may seem unrelated, is a short term drop in the 24vdc system. Having worked on ABB's in some hot, wet, nasty environments for about 15 yrs I've seen a few DC faults. Momentary and otherwise.I can always be wrong but that's a good place to start troubleshooting. Good luck.
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I have not been on the forum for quite a while so I hope this reply can still do some good.
It sounds to me that you push the button you are dropping the +24vdc so low to the computer (or system) that you are forcing a restart. Try putting a meter across 24v and 0v while you push the button.If you don't see it there start working your way downstream to the next component that activates.