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Replacing the controller in its housing – West Control Solutions N8100 User Manual

Page 51

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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

59125

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