Replacing the controller in its housing – West Control Solutions N8100 User Manual
Page 51
2.2
REMOVING/REPLACING THE OUTPUT 2/OUTPUT 3
OPTION PCBs
With the Controller removed from its housing:
1. Gently push the rear ends of the CPU PCB and Power Supply PCB apart
slightly, until the two tongues on each of the Output 2/Output 3 Option PCBs
become dis-engaged - see Figure 2-2B; The Output 2 Option PCB tongues
engage in holes in the Power Supply PCB and the Output 3 Option PCB
tongues engage in holes on the CPU PCB.
2. Carefully pull the required Option PCB (Output 2 or Output 3) from its
connector (Output 2 Option PCB is connected to the CPU PCB and Output 3
Option PCB is connected to the Power Supply PCB) - see Figure 2-2C. Note
the orientation of the PCB in preparation for its replacement.
Adjustments may now be made to the link jumpers on the CPU PCB, the Output
2/Output 3 Option PCBs (if DC output) and (on
1
16
-DIN Controllers, if fitted) the DC
Output 1 PCB. The replacement procedure is a simple reversal of the removal
procedure.
2.3
REMOVING/REPLACING THE RS485
COMMUNICATIONS OPTION PCB OR DUAL SETPOINT
OPTION PCB
This Option PCB is mounted on the inner surface of the Power Supply PCB and can
be removed when the Controller is removed from its housing (see Subsection 2.1).
Figure 2-3 illustrates the removal/replacement procedure. It is not necessary to
remove the Output 2/Output 3 Option PCBs to perform this procedure.
2.4
REPLACING THE CONTROLLER IN ITS HOUSING
To replace the Controller, simply align the CPU PCB and Power Supply PCB with
their guides and connectors in the housing and slowly but firmly push the
Controller into position.
CAUTION: Ensure that the instrument is correctly orientated. A stop will
operate if an attempt is made to insert the instrument in the wrong
orientation (e.g. upside-down). This stop must not be over-ridden.
S054-2
2-3
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