Heidenhain TNC640 brake test deactivation

Hello folks.
I need a solution for my Heidenhain TNC640 problem. We have Hermle C250 5axis mill and i need to turn off my brake test. I mean this brake test which happens after 8 hours of operating the machine. It always does brake test when you start the machine, but it also does it after 8 hours of operating, but how can i turn it off. I need it for automation, our robot cant understand when brake test happens and this causes us some problems. All ideas are welcome. Thanks.