Hello experts,
I have a Fanuc S-430iL with RJ3 controller. I am getting this FSSB disconnect alarm on my Teach Pendant. If I power my robot down for 15-20 min and start it up again the alarm goes away but after a cycle or two it pops up again and stops the robot. Does anyone know what could be the problem?
I have checked the fuses FS1 and FS3 in the servo amplifier, they seem to be fine.
Any help is much appreciated.
SRVO-057 Fault G1 A6
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Atinder Singh -
February 14, 2018 at 3:31 PM -
Thread is marked as Resolved.
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Just has the same problem with an m6i last week "Fanuc Servo Serial Bus" disconnect...We also doesn't find any problem.It happened in the same position all the time.After I slowed down that movement the problem doesn't come back again.It was maybe a broken cable or connector on the mechanical part...but i'm not sure.Try to slow down the robot and if the problem still exist check your cables and connections.
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Yeah even we are not able to detect the exact problem but we looked into the controller servo amplifier unit and seemed to be a lose fiber optic cable. We moved that cable a little bit and boom it started running. I don't know that it was the problem or we just got lucky.
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Yep we also checked the optical cable, but there was no problem with it...maybe that solved our problem too
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RJ3 controllers have issues with FSSB alarms.
Fanuc had procedure to help. Power down the robot, disconnect the fiber optic cable from the cpu. Power the robot on and let it boot. Power it down, reconnect the fiber cable and power it back on.
If this doesn't work they suggest you replace the PCB on the backplane.Some times you can get it to go away just by cycling power. In my experience, it always comes back.
I don't have any feedback from any of the customers I replaced the PCB for, so I can only assume it worked. -
Yeah man we got it working yesterday but today when I come in, it had the same fault. So I took the cable out turned my controller off and then power it back up. Then again I powered it down and placed the cable back in position and it started working. After that the fault never came up but for precaution we had a new cable so I put that one in and it has been running now for like 3 hours. We are gonna monitor it, if the fault comes back again, we might replace the board.
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We struggled alot with this fault and finally came to know that the EE connector cable was damaged and that is what's causing this alarm. It was missing a ground wire connection from the connector plug. Here is the picture of the connector-
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Hello All Experts,
My company have Fanuc s430iL robot, and we have Servo 57 FSSB communication error coming from last 1 yr but we find the problem in CRP10 Connector error. When that connectors cable lose contact then at Servo amplifier Voltage drops, there is CH1, CH2, CH3, CH4, CH5 and CH10 Points are there that location, Voltage is coming 24v, 15v, 5v, 3v, -15v and 0v respectively, when FSSB error is coming then that time voltages drops at 21v, 11v, 4.1v, 2.5v -11v and 0v. I am checking optic cable it is ok. This is another possiblity of FSSB alarm. I am doing every time tight the pins and wire connection in CRP10 connector then again its works non stop. But after some days same issue is coming then again i am tight that connections and again start the Robot.
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We struggled alot with this fault and finally came to know that the EE connector cable was damaged and that is what's causing this alarm. It was missing a ground wire connection from the connector plug. Here is the picture of the connector-
Sorry for bumping an old post, where would the EE connector cable be located?
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The EE connector is on the back of the robot arm itself. It feeds various solenoids etc on the robot itself.
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It may sound foolish but we got rid of our SRVO-057 error by replacing the Fanuc Teach Pendant cable.
Has been working non-stop for two weeks now.