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Opto-isolated Output Board Option Hydrastep 2468CB & 2468CD Manual
3c-8 24685034
3c.3.1.2 Electrode/Alarm Operation (output 1 function only) - SW6
Opto-isolated output from TR2 can be configured to receive either an electrode input or it
can be used as the ‘system fault’ output. The two positions are detailed in Figure 3c.1 (on
page 3c-6). When configured as the system fault output, the opto-isolated output is
energised (low resistance) in the normal (non-fault) state and is de-energised (high
resistance) for a fault condition.
The system fault output connections are shown in the next section.
3c.3.1.3 Opto-Isolated Output Activation (‘In Steam’ or ‘In Water’) - SW5
SW5 is a four-channel switch, one channel allocated per opto-isolated output. The choice
presented by each channel switch is whether the output device is energised (low resistance)
when the particular electrode is in water (W) or when that electrode is in steam (S). Switch
SW5 is highlighted in Figure 3c.1 (on page 3c-6) to provide additional information on channel
identity and the switch ‘electrode state’.
3c.3.1.4 System Fault Output
Opto 1 on each opto-isolated board can be configured to be a system fault opto-isolated
output by setting SW6. When used as a system fault opto-isolated output the normal state
of Opto 1 is low resistance and a fault state will cause Opto 1 to go into its high resistance
state.
Opto 1 will only output faults detected by the input board onto which it is installed. With a
dual power supply Hydrastep unit, this means it is necessary to used two opto-isolated output
boards (one on each input board) to create a system fault output.
TR2
(Switch SW6 set for Fault Signal operation)
Opto-output 1
TR4
Opto-output 2
+ VE - VE
Even Electrodes
(LH Input Board)
Note: External power must
be applied as shown.
See specification for
power requirements
Odd Electrodes
(RH Input Board)
1
4
3
2
PL 2
1
4
3
2
PL 2
To alarm annunciator or
tripping device
Note: Systems with a local display have an opto-isolated system fault available from the
display board.