GE DFF1000 Series, Instructions Manual, Page: 31 / 59

GEK – 106166B
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Each of these modules has a DIN type front connector for the connection to the internal communication bus. Also,
in the case of having connections to the outside (Inputs, Outputs and power supply modules), the male part of the
terminal block is incorporated. The female portion of the connector is located in the rear plate of the box.
Besides all these modules there are some other boards mounted in parallel to the front of the box. These boards
are:
- Internal bus board.
This is a PCB board that makes the connection between the digital inputs and the power supply through their front
DIN connectors.
- Front display board.
This is a PCB that includes the display and the configurable LEDs. Additionally the relay also includes the
communication port connector and the two-colour state LED.
The front module is mechanically and solidly connected to the keypad board, the electrical connection is done
through a flexible flat cable of 12 pins.
The subgroup formed by these two front boards is connected to the rest of the relay through another flexible flat
cable of 40 pins, connected itself to the front of the communications CPU.
- Front keypad board.
It is a printed board which is solidly joined to the front board of the display, as mentioned before, and supports the
keypad for the protection operation (20 keys alpha-numeric and functional keypad that acts on the alpha-numeric
display) The board also includes a transparent window for the display and for the control board in which the unit
identification (model number and serial number) and its more relevant technical characteristics are included.
The group formed by both front boards is mechanically and electrically joined to the box by means of 4 screws
placed at upper and lower part of the front. To get the access to the internal electronic modules of the relay the
next steps must be followed (once the relay has been disconnected):
1. Remove the plastic cover.
2. Slack the fixed frontal screws till they are untied and only fixed by their fastening sleeve.
3. Let the front part fall softly till the flat cable, that is connected to the communications board, is accessible, and
unfasten the extreme connected to this board.
4. Remove the frontal module.
5. Take out the internal bus board which fixes the different modules themselves.
If this process is followed, every relay module can be accessed in order to be taken out, maintained or replaced. In
order to assembly the relay again, the procedure is the contrary, that is to say:
1. Make sure that every vertical drawout module has been correctly inserted.
2. Assembly the internal bus board which joins the different modules themselves by pressing from left to right
every connector in order to be sure of their right insertion.
3. Connect the flat cable that connects the frontal module with the communications board.
4. Place the frontal module at its position and screw it on the box.
5. Cover again the relay with its protective cover.