Precautions For Replacement - Mitsubishi Electric MELSEC-A0J2H Series Handbook

1
INTRODUCTION

1.3 Precautions for Replacement

(a) To replace the A0J2HCPU with the QCPU or replace modules using renewal tool for A0J2, be
sure to refer to the following manuals.
Select correct products after checking the functions, specifications, grounding method, and
usage.
(Reference manual)
• Manual for each Q series module
• Renewal tool for A0J2 series transition from MELSEC-A0J2(H) series to renewal system using
renewal tool (Refer to Appendix 3.6.)
(b) After replacing A0J2HCPU, be sure to check operation of the entire system before actual
operation.
Point
Before replacement, make sure again that the frame ground of the programmable controller system is
securely grounded.
The noise tolerance of programmable controllers is secured by diverting noise to ground via the frame
ground as an EMC measure.
For this reason, the system might be affected by noise if the system is reconfigured with insufficient
grounding.
Also, consider the following as a provisional measure when checking grounding status is difficult.
(1) Change the ground of the system into an exclusive ground.
(2) Add a ferrite core between the ground wire and the module FG terminal.
For MELSEC-A/QnA (large type) Series to Q Series transition related products manufactured by Mitsubishi
Electric Engineering Co., Ltd. or Mitsubishi Electric System & Service Co., Ltd., contact your local sales office or
representative.
1
- 13