Troubleshooting Rexroth Power Supplies


We specialize in Rexroth electric drives, controls, and servo motors, so you can always call us when you need troubleshooting for Rexroth power supplies. If you’re determined to give it a try yourself before calling, here are some tips for you.

First, have an electrician do the electrical work.

Second, be sure to turn off the electric supply to the power supply before you mess with it. That doesn’t just mean turn the power supply off. That means be very clear to everyone that the master switch must not be turned back on. Make sure you have no motors running. Put safety caps on any connectors. Secure hanging axes against movement. And give the DC bus 5 minutes to discharge completely before you get your hands in there.

Be safe by using metrological equipment to double check and be sure there’s no live power.

The fault displays will show directly under the RESET button. Broadly speaking, you want to see green lights. The exception is the Bleeder Overload button, which will be dark if there is no problem. Red lights are a clear signal that you have a problem.

What kind of problem? Here are some likely culprits:

1. Problems with a cable. This is actually one of the most common problems you’ll face, which is why we recommend keeping extra cables on hand.

2. Drive running too fast. Sometimes upgrades make it possible to run the new machinery faster. This is no good if the rest of the machinery can’t keep up. Be realistic.

3. Defective fuses. This happens. If it happens to you, replace the fuses and carry on.

4. Interruption in the power supply. It could be the weather, it could be a dirty power supply, or it could be a fluke. Find out.

Bear in mind that a problem with your electricity could cause diagnostics signals to show false results.

If you’ve checked all these issues and you have not been able to solve your problem, you should call us. We can provide emergency replacement units fast and get your facility back to work fast.

24 Hour Turnaround

Factory Repair services available with 24 hour turnaround.

Call (479) 422-0390 for immediate assistance

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