Anybody have any experience with this alarm? I sent my amplifier in to be tested/repaired. They said it checked out OK and ran all day long. But when I took it out, the robot was faulting at 20% override speed. Error manual says to check RM1 and brake cables. Any particular pins on the RM1 I should focus my attention on? Any help would be much appreciated... oh, yeah, M-16iA/R-J3iA.
SRVO-018 Brake Abnormal
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droth -
March 14, 2017 at 5:17 PM -
Thread is marked as Resolved.
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OK, I'm a jerk. A simple search brought up several instances of good advice when trying to diagnose this error. Sorry to waste your time.
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Just replaced a servo amp Monday because of that alarm
Alarm was only in auto no fault in teach -
This alarm is a real pain.
I have run into it twice and both times it was the robot internal cables.
Use a meger to test the cables as an ohm meter will not find the problem -
I've only ever had this problem on a M3-iA robot and it was a cable that got rubbed down to the wire.
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When you are megging are you going wire to wire or wire to receptacle? Or both.
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I disconnected all of the brake connector and then I went from the pin in the robot's Harting connector to ground.
In both cases, an ohm meter would not show continuity to ground but the megger did. -
Well, 5 days later... Found a cracked surge supressor on one of the brake lines in the box with the Hans connectors. Was advised to remove. On power up, the fault remained, however, an E-STOP and reset fixed the problem. Thankfully, the operator thought of the ESTOP, because I was ready to pull my hair out. But I must agree with the rest of you. This fault was a major pain to track down.
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Found a cracked surge supressor on one of the brake lines in the box with the Hans connectors.The box you speak of is on the controller or the robot itself?
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On the robot itself, where the main robot cables attach to the arm via Hans connectors. They are a gray, dime-sized disk with leads spliced into the brake lines.
And unfortunately, once my operator got set back up and ready to run production, guess who reared his ugly little head again...
So, I'm back to tracing wires and trying to isolate the offending axis/motor. Which leads to my next request. Does anyone have a schematic/pinout of the RM1 cable for an M-16iA robot and R-J3 controller? This is the original R-J3, not the R-J3iB controller, if that makes a difference.
I will send an email address via PM if anyone can help a brotha out. Just what I was hoping to spend my Friday on!
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Whew. Found it, I hope. Brake cable from axis 1 must have a break in it. Which seems a little weird considering how very little of the cable is even exposed...
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This is absolutely nuts! Axis 1 cable replaced/repaired, but to no avail. Faults still occurring. I walked away to gather my thoughts when the manager for that department stops by my office to say, 'Hey, he's got that robot running. He has to use FINE termination on all of his moves, but it is running.'
And sure enough. Robot runs just perfect as long as there is no continuous motion in the program.
Anyway, I think through all the trials and tribulations, we've at least determined that the real issue resides in the Axis 2 motor. I think. But that's something that will have to wait until Monday. Woohoo, can't wait.