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Hydrastep 2468CB & 2468CD Manual Opto-isolated Output Board Option
24685034
3c-3
3C.1 GENERAL DESCRIPTION
The Opto-isolated Output Board (PCB 24680505) has four opto-isolated outputs and is
mounted on top of the input board using 3 nylon spacers. Electrical connection between the
two boards is via a plug and a socket (SK1 on the input board and PL1 on the opto-isolated
output board).
A second opto-isolated output board may be mounted on top of the first on spacers. Holes
have been drilled on all opto-isolated output boards to receive the 3 nylon spacers. The top
output board is offset towards the centre of the unit improving the cable layout from the
opto-isolated output boards. The spacer fixing holes and mounting holes are illustrated in
Figure 3c.1 (on page 3c-6).
Note: The term energised is used to describe the ON (low resistance) state of the opto-
isolated output.
Each of the opto-isolated outputs can be energised by any one of up to 16 electrodes, with
an individual choice of being energised when its selected electrode is in steam or is in
water. Furthermore, opto-isolated output 1 can be used to monitor an electrode state or to
register an ALARM condition. When set to register the ALARM state, the opto-isolated
output is energised in the ‘system normal’ state and de-energised when an ALARM
condition exists.
This option comes complete with the nylon spacers and two 8-way output sockets.
3C.2 INSTALLATION
This sub-section deals with the mechanical and electrical installation of the Opto-isolated
Output Board (PCB 24680505) option. In the rest of this chapter the ‘opto-isolated output
board’ title is shortened to ‘output board’.
3C.2.1 STORAGE & PRE-INSTALLATION INSPECTION
3c.2.1.1 Storage Area
The storage area must be dry, dust-free and kept at a reasonable temperature. The storage
area should allow for access and inspection of all items of equipment.
3c.2.1.2 Pre-installation Inspection
Open the option package and inspect the contents for signs of damage. Check contents for
completeness.