roomba 360 slow to back off

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roomba 360 slow to back off

Postby Binny » November 23rd, 2013, 5:01 am

Hi everyone my 360 has developed and interesting problem. It keeps pressing against walls or anything for between 5 and 10 seconds before it backs off, or turns away. If you put your foot in front of it, it will keep bumping into it quite hard. Other then that everything seems normal, the only real problem is if it gets into a tight spot it takes a long time to get out, and sometimes gives up. Has anyone seen this before?
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Re: roomba 360 slow to back off

Postby plaroche » November 23rd, 2013, 6:59 am

Could be that the optical sensors have gotten dusty or that the bumper might have popped out of place. Not entirely sure though.
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Re: roomba 360 slow to back off

Postby vic7767 » November 23rd, 2013, 11:05 am

Binny wrote: it gets into a tight spot it takes a long time to get out, and sometimes gives up
And when it gives up, how many times does it beep ?
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Re: roomba 360 slow to back off

Postby mfortuna » November 23rd, 2013, 11:37 am

Is this a roomba 630? There is no 360 model I believe.
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Re: roomba 360 slow to back off

Postby TechGuy » November 23rd, 2013, 1:36 pm

Binny, welcome to the forum.

Since your Roomba can back off after a few tries, one of the wheel may not rotate backward. When it hits the wall in correct angle to trigger the other bumper sensor with the good wheel, it will back off and move away.

Run the BiT to determine which wheel does not rotate backward. If both wheels rotate backward, check the bump sensors test.
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Re: roomba 360 slow to back off

Postby gregj » November 23rd, 2013, 2:48 pm

630 ?
meep
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Re: roomba 360 slow to back off

Postby vic7767 » November 23rd, 2013, 2:52 pm

Or a 560 !
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Re: roomba 360 slow to back off

Postby Binny » November 23rd, 2013, 9:35 pm

Ha ha sorry 560 (mental gremlin)
Thanks TechGuy - Test shows right wheel running slowly, and not reversing. I have a 530 here that I can swap the wheel out of, to double check. The wheels were the last thing I would have thought of, I was focusing on the bumpers.
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Re: roomba 360 slow to back off

Postby TechGuy » November 23rd, 2013, 11:00 pm

Binny wrote:Ha ha sorry 560 (mental gremlin)
Thanks TechGuy - Test shows right wheel running slowly, and not reversing. I have a 530 here that I can swap the wheel out of, to double check. The wheels were the last thing I would have thought of, I was focusing on the bumpers.

You are welcome. It makes debugging problem much easier when you have another working unit for testing.
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Re: roomba 360 slow to back off

Postby Binny » November 23rd, 2013, 11:17 pm

OK; It's in the right wheel but not the wheel module it's self.
Wheel module tests OK in the 530.
Software?
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Re: roomba 360 slow to back off

Postby vic7767 » November 23rd, 2013, 11:36 pm

H-bridge failure is a common fault in the 5XX Roomba.
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Re: roomba 360 slow to back off

Postby TechGuy » November 23rd, 2013, 11:42 pm

Binny wrote:OK; It's in the right wheel but not the wheel module it's self.
Wheel module tests OK in the 530.
Software?


Did you test both wheels on your 530?
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Re: roomba 360 slow to back off

Postby Binny » November 23rd, 2013, 11:54 pm

Yeah every thing tests OK in the 530.
Looks like a H-bridge failure.
Ha ha I'm waiting on bump sensor parts for the 530. So I can pull them out of the 560 and still have one bot working while I'm waiting for the H-bridge parts.

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Re: roomba 360 slow to back off

Postby Gordon » November 24th, 2013, 2:24 am

Binny wrote:...while I'm waiting for the H-bridge parts. ...
Determination of what to order is problematic. As a child you may have been exposed to this ancient song:
Accompanying music please...
Ohhhh, the toe bone is connected to the foot bone, and
The foot bone is connected to the heel bone, and
The heel bone is connected to the ankle bone, and
The ankle bone is connected to the leg bone, and ... so on--clear up to the head bone.

That is also the way it is with a motor's H-bridge!

Start up the music again, please...

Ohhhh, the motor is connected to forward & reverse pairs of power transistors, and
The pairs of power transistors is connected to their medium power xstr drivers, and
The medium power xstr drivers is connected to the low power buffer xstrs, and
The low power buffer xstrs is connected to the quad NOR-gates of U6, and
The quad NOR-gates of U6 is connected to the MCU's outputs.
{end of song#2}

I would not want to say R3-Roombas have suffered many H-bridge failures. There are too many single point failure sources between the MCU and the power elements of the H-bridge that may stop or alter a motor's correct operation, without there being a fault in the actual H-bridge (two each power PNP, & NPN xstrs, + four snubber diodes).

Saying something like: Numerous R3-Roombas have suffered loss of proper motor control, might be more appropriate.

To obtain further insight into R3's bridge outlier components (those indicated in the 'song'), please read this linked post:

viewtopic.php?p=112075#p112075

You may find information that either helps you get started with EE troubleshooting, or simply assists in deciding to buy a replacement main_PCA, a.k.a., 'mobo'.
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Re: roomba 360 slow to back off

Postby mfortuna » November 24th, 2013, 7:50 am

Part Engineer, part song writer. Ladies and Gentlemen, I present Gordon Plews on the first leg of his "Rocking Roomba Tour" :D
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