# Second-hand CV500 lost every parameter when the PLC battery went flat

**URL:** <https://cnc-routers.org/t/second-hand-cv500-lost-every-parameter-when-the-plc-battery-went-flat/97>\
**Category:** Troubleshooting & Support\
**Created:** [October 20, 2026, 12:26pm UTC](https://cnc-routers.org/t/second-hand-cv500-lost-every-parameter-when-the-plc-battery-went-flat/97 "2026-10-20T12:26:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![clara\_b](https://cnc-routers.org/user_avatar/cnc-routers.org/clara_b/32/65_2.png) [@clara\_b](https://cnc-routers.org/u/clara_b)\
**Post date:** [October 20, 2026, 12:26pm UTC](https://cnc-routers.org/t/second-hand-cv500-lost-every-parameter-when-the-plc-battery-went-flat/97/1 "2026-10-20T12:26:13Z")

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We picked up a used Mori Seiki CV500 a while back and the guy we got it from never kept a backup of anything. Now the PLC battery has run down and the parameters are gone.

The control is an MSC-803. It powers up, but there is nothing in it to run with, so the machine just sits.

Does anyone have a parameter set off a CV500 with the MSC-803 that they would be willing to copy for us? Even clear photos of the parameter pages off a running machine would get us moving, we can type them in by hand.

One other thing while I am at it - is the battery on these a standard cell you can get locally, or does it have to come from the builder?

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**Author:** ![cutscope](https://cnc-routers.org/letter_avatar_proxy/v4/letter/c/4af34b/32.png) [@cutscope](https://cnc-routers.org/u/cutscope)\
**Post date:** [October 20, 2026, 1:36pm UTC](https://cnc-routers.org/t/second-hand-cv500-lost-every-parameter-when-the-plc-battery-went-flat/97/2 "2026-10-20T13:36:17Z")

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You’re wasting time hunting for hand-typed parameters. I once had a Haas lose all settings after a battery died, and typing in every parameter by hand took three full days of unbillable work. Cut that approach. What backup steps have you already tried?