C740A11 - Soft Start Circuit

Technical Questions
1

Hello,

I am attempting to power a UR20 while powering the OEM control box, DC variant, with a 48V battery.

I’m using a 100A circuit breaker, and the inrush protection/soft start circuitry I’ve seen recommended before. This being the MM35 1R550

When trying to power on the robot art, I get the error C740A11, 48V voltage is outside of the allowed range: 39.9519

I believe this is something to do with my soft start circuit and running the box/arm instead on an AC/DC supply results in no issues.

I would still like to use soft start circuitry though. My thought was to change out the MM35 to a model with a smaller resistance. Has anyone had experience with this?

Thank you

2

I think the recommendation of using the MM35 1R550 was for UR10e/UR16e, since the articel here is aimed for these robots: Power Supply Unit (PSU) for AC to DC for testing OEM DC Controller

I don’t think the 100A breaker and 400A inrush current qualify for the UR20 and UR30. But I haven’t got any other information than this.

3

Regarding the usage of the UR20, do you happen to know what components can be used for the soft start circuitry? The manual does not seem to hint towards what would be recommended, just simply that they DO recommend you using it.

Thank you,
-Kyle

4

I don’t, no. :frowning:

Maybe you create the question in MyUR, and UR will get back to you with an answer. :slight_smile: