The Mitsubishi Meldas 64 series is a high-performance CNC (Computer Numerical Control) platform known for its rigid construction and advanced interpolation capabilities. To fully utilize or troubleshoot this control, operators must reference the Meldas 64 Parameter Manual. Unlike the operation or programming manuals, this document governs the machine's hardware configuration, servo tuning, I/O allocation, and option activation.
Using the Meldas 64 control panel:
Critical Safety Warning: Modifying SV or SP parameters without grounding the drive system can cause violent axis movement or spindle runaway. Always disable the servo-ready signal (MCC off) before editing.
Symptom: One morning, your 1999 VMC shows an “Absolute Position Lost” or “Battery Alarm” on the M64 control. The Fix: You need to reset the absolute position parameters. Without the manual, you won’t know which parameters store home positions (typically parameters starting with #2000 to #2048 depending on axis count). You also won’t know the sequence to turn off the alarm (set parameter #1260 or similar). mitsubishi meldas 64 parameter manual
The manual devotes a chapter to Device Mapping. You don’t edit these manually; you upload a file.D (ladder logic). However, you need these to diagnose:
Pro Tip from the Manual: If the machine won’t home (reference return), check parameter
#2013 ZRNand#2014 ZRNDIR. The manual’s table shows bit 0 = positive direction homing vs bit 1 = negative. This is a 50% likelihood of trouble.
| Method | Speed | Required Equipment | | :--- | :--- | :--- | | RS232/RS422 I/O | Fast | PC with Meldas 64 communication software (Procomm or Tera Term) | | Memory Card | Fastest | PCMCIA SRAM card (512KB max) | | Manual Input | Painfully slow | Printed parameter sheets from when the machine was new | The Mitsubishi Meldas 64 series is a high-performance
Note from the manual (section 3.5.2): Input parameters in this order: NC → Servo → Spindle → Option → PLC. If you load PLC last, the machine will come alive.
A common question: “I am retrofitting a Meldas 64 to run modern servos (MDS-DJ). Do I still need the old parameter manual?”
Yes, but with modifications.
Mitsubishi released a technical bulletin (TB-1316, available on their portal) that maps old M64 parameters to new M80 controls. This is vital if you are modernizing.
Parameter #3001 to #3020 store pitch error compensation (ballscrew wear mapping). If you zero these out, the machine will still run, but tolerances will be off by 0.01mm per foot. The manual explicitly warns: “Compensation data requires laser interferometer verification.”