Emerson 6888Xi User Manual
82
Maintenance and Service
Section 5: Maintenance and Service
6888Xi Advanced Electronics Instruction Manual
December 2012
PN 51-6888Xi
Replacing an Existing I/O Board
1.
Loosen the four screws securing the 6888Xi cover. The screws are captive and do not need
to be completely removed.
2.
Swing the 6888Xi cover down to expose the inner components.
3. Disconnect the 10-pin ribbon cable from the I/O Board. A new cable is supplied in the
replacement kit and should be used if the old one is damaged.
4.
Tag and disconnect wiring for Alarm Outputs, Flame Status Input and/or SPS/IMPS as appli-
cable.
5.
Slide the I/O Board part way out of the 6888Xi enclosure.
6.
Disconnect the 4-position plug for the transmitter probe and output wiring. Remove the I/O
Board completely from the 6888Xi enclosure.
7.
See Figure 5-3. Set jumpers JP1, JP2, JP5, JP7 and JP8 to their proper positions using the old
I/O Board as a guide.
8.
Set switch SW4 to their proper positions using the old I/O Board as a guide.
9.
Partially slide the new I/O Board into the 6888Xi enclosure. Ensure the board is correctly
aligned within the slots in the enclosure.
10. Connect the 4-position plug for the transmitter probe and output wiring. Slide the I/O
Board completely into the 6888Xi enclosure.
WARNING
If the existing I/O Board has been operated with enhanced software features, these features must be
activated in the new board before the 6888Xi Electronics is put back into service. Failure to do so will
cause a false analog output signal to the DCS.
6888Xi
6888Xi
6888Xi
6888Xi
FIGURE 5-3. I/O Board Jumper & Switch Settings