5.39
4. Connect yellow and black wires into TB-F.
Black wire to centre connector.
Yellow wires to outer connectors marked ‘26V’.
5. Remake output connections. Observe polarity.
6. To select 4-20mA or 0-20mA see section 3.7.3.
5.3.6.8 Replacement of Data Output Board
1. Pull out board (PCB5) from unit.
2. Disconnect violet and green wires from TB ‘M’.
Disconnect output connections (note their position.)
3. Connect violet and green wires into TB ‘M’ on new board.
(Green wire to centre connector
Violet wires to outer connector marked ‘10V’).
4. Plug in replacement Data Output Board into third slot from the left.
5. Remake Output connections.
5.3.6.9 Replacement of Alarm or Auto-Calibration Board
1. Disconnect wires from relay terminal block.
2. Unscrew and remove screws holding terminal block to case.
3. Pull board (PCB 6 or 7) from unit.
4. Set link ‘SC2' to select whether the board is being used for alarms or auto-calibration.
5. Alarms - Set link ‘SC2' to ‘SEL2'
Auto-calibration - Set link ‘SC2' to ‘SEL3'
6. Plug replacement board into left hand or second from left slot.
7. Screw terminal block to inside of case and remake connections to terminal block.
5.3.6.10 Coarse Span Setting
If the analyser is to operate at a significantly different altitude to that at which it was first tested,
difficulty may be experienced when adjusting the span calibration. In this case it will be necessary
to select a new value for the coarse span resistor on amplifier board 01100925.
- On amplifier board 01100925B adjustments are made by changing the position of the wire
link(s) between L, M and N.
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