Month: June 2026

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Technical Analysis and Troubleshooting Method for Hitachi Seiki HT 23R III CNC Lathe L2191 “MACHINE UNREADY” Alarm

Hitachi Seiki HT 23R III is a typical medium-sized CNC lathe equipped with the SEICOS L MULTI / SEICOS MULTI control system. On this type of machine, when the control screen starts normally and the software version page can be displayed, but the alarm line shows L2191 MACHINE UNREADY, the problem usually does not mean that the NC system has…

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