Modbus Option Card Properties
Publication
PUB091-004-00_0918
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FITTING THE MODBUS MODULE OPTION CARD
3.1 Inside an IQ3 actuator
The MFU is suitable for fitting into IQ3 actuators. When factory-fitted, their wiring diagrams will contain
an
‘M’ - 100M2000 for single channel and 100M3000 for dual channel. The MFU can be located in one
of 2 or
4 option ‘slots’ located on the back of the control module PCB, housed in the electrical cover.
There are 2 slots for directly connecting the option module to the control module and where those
slots are already filled, the option card can be fitted on top of the existing modules. The modules can
be stacked 2 high
where a ‘deep’ electrical cover is fitted.
Back of the control module
Fig 3:
The MFU and its location behind the control module in an IQ3
With the IQ3 actuators, the remote inputs are always present (they are conditioned by the control
board) and there is an option to include Digital Outputs from relay contacts. If the MFU is required to
operate the 4 digital outputs that can be controlled from the card, then an Extra Relay Indication card
associated with these outputs must be fitted into another option slot in the actuator.
The MFU is connected to the control module by a 10 way header (SK2). The wiring harness from the
actuator terminal bung connects the Modbus RS-485 field connections to SK3.
3.2 Replacing or Fitting a Modbus Module Option Card
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. Unplug the electrical housing loom from the control
board and remove the cover. Unplug the grey ribbon cable from the edge of the control board and
unplug the black plastic carrier frame from the frame legs. Unplug the loom from the MFU card.
Unscrew the Torx 20 screws holding the MFU card into the frame and carefully unplug the MFU card
Option Slots
