Modbus MFU Option Card Installation Manual
14 of 64
Publication PUB091-004-00_0918
3.5 Inside a CMA actuator
The MFU is suitable for fitting into CMA actuators, wiring diagrams MXX-MX (where X can be any
value) detail the option card connections on the terminal strip. The MFU module is fitted in the only
option board slot inside the CMA electrical housing.
Fig 5:
The MFU located in a CMA actuator
Only the single channel Modbus option card can be fitted to this actuator family.
The MFU should be replaced or fitted only in a suitable environment. The actuator must be made
electrically safe before opening any covers. The electrical housing cover should be removed after
unscrewing the four 6mm Allen machine screws.
The MFU should be fitted in the position shown in the illustrations above. It plugs into the control board
at the 10-way header, which is SK2 on the MFU board. There is a wiring loom which brings the
RS-485 network connection to SK3 on the MFU. This loom comes from SK5 and SK6 of the Modbus
terminal board, which in turn is where the field network connections are made.
Connection details are shown in the illustrations on the next page.
The CMA actuator will need configuring, so that it is aware that control from the field is through the
MFU card. This is done by accessing the menu structure shown in figures 7, 8, and 9.
Configuration details may be found in the CMA Installation and Maintenance manual, PUB094-003,
found on the Rotork web site.
Option location
