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There should be additional alarms that show up on the control such as S01 Servo Alarm PR:---- $1. The EX007 is just a general alarm.
You could look in the electrical cabinet at the drive unit...

A-20 VI is a 4 axis swiss-style machine. $1 side Z1, X1, Y1 (ID tool block attached to $1 side), & Z2.
A2-20 VII is 5 axis swiss-style machine. $1 side Z1, X1, Y1 (with same ID block as VI), & X2,Z2...

Press & Hold CB/CAN button while jogging Y axis. Or while powering up machine press & hold CB/CAN button, this over-rides all soft overtravel alarms on 300 & 500 series Mitsubishi controls.

When doing the PLG Auto-Adjust procedure on the sub-sp, you only need to change SP240 for collum (2), to a 0. Power machine down, wait 10 sec, power up, unlock parameters, Maint, PLC/IF, (1001)()(M)...

Sometimes the radius in the program might need to be tweeked, are you using G12.1, or are you selecting the proper plane select (G19 Y-Z plane).

Shadow
CMA Service

I could tell you, but then I'd have to kill you, and anyone you may have talked too.
You know "company secrets," there was 2 differnet ways of turning options on the M2 series machines, the proper...

You CAN do longer parts on the B-12 using the rotary GB, it would just not be driven from the headstock as normal, a 2.5" stroke.
Non-syncronized rotary GB, works for stock larger than .25" but...

Almost any corruption on the Mitsubishi 500 series NC system requires re-intalization to be done. Basically make the NC brain-dead, then reload parameters & SRAM, through the RS232 port after you...