Mitsubishi Electric MELFA CR800 Series Instruction Manual page 139

2) Fix the metal plate to the installation position using the M4 screws (supplied by customer).
Select a screw length so that 2.1mm or more and less than 7.0mm of the screws can be tightened in the studs
on the controller.
3) After the metal plate has been installed, fix the safety extension unit to the plate using the M5 screws (supplied
by customer).
Select a 10mm to 12mm long screw.
Appendix 2: How to Install the Safety Extension Unit 8-129
8 APPENDIX