Hey, looking for some help. I have a RJ3 controller giving me a servo-136 alarm. I have researched this and about all I can find is suggestions to replace the amp and e-stop unit. I have replaced the amp and on first power up after pressing shift and reset to power up the servos it appears one or two of the three 30 ohm ceramic resistors on the bottom of the amp immediately starts glowing then burns up but as long as I keep holding the shift key and dead mans I can move every axis of the robot without problem but once I let off the shift key or the dead man switches and try to reset again I get a number 4 on the amp and the servo-036 alarm. I have replaced the e stop unit, ohm all the cables and haven't found anything so I'm hesitant to try a third amplifier without some indication of what the problem is. Anybody have anything similar happen? Its my understanding that the three 30 ohm resistors are there to bleed off the three capacitors after servo power has been removed?
fanuc rj3 controller/ s-430iw srvo-136 DCLVAL alarm burning up amplifiers
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Harleydude -
July 13, 2020 at 3:19 PM -
Thread is Unresolved
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Change the magnetic contactor. Make sure the 3 DBR resistors are plugged in to CRR45A, B, & C connectors are plugged in at the amp.
Is this an i-cabinet or B-cabinet?
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Its a "B" cabinet, when you say change the magnet contractor are you referring to the ones associated with the e-stop unit?
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I have changed the entire e-stop unit (with contactors) triple checked all connections, all seems good but when I press shift+reset to enable the drive instantly the bottom resistors on the amplifier start glowing red, I was quick enough to stop if from blowing this time but....still got the same problem. Where are the braking resistors located? Are they inside the back of the cabinet where the transformer is? We have checked resistance on the breaking resistors and they all read about 9.5 ohms
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Yes they are about 9 ohms each and located in the back with transformer. Looking at the picture, it shows a B-style RIA cabinet.
When you release the deadman switch, incoming main power & pre-charge to the servo amp should be interrupted by the Redundant E-Stop and the dynamic braking resistors plugged into the CRR45(x) connectors should shunt the bus voltage.
Try unplugging all six motors from the amp and see if it still does it tries to cook those resistors when you enable the contactors.
Do you have another amp you can try? Perhaps the current one was damaged by the old Redundant E-Stop.