3C.3.2.4 'Two Out Of Two' Opto-Output Alarm System - Emerson Hydrastep 2468 series Operating Manual

Hydrastep 2468CB & 2468CD Manual

3c.3.2.4 'Two out of Two' Opto-output Alarm System

This system requires both opto-outputs to operate to cause an alarm when their assigned
electrodes register an alarm condition.
Case A - Opto-output circuit normally open circuit, short circuit both to trip
TR2
Opto-output 1
Odd Electrodes
(RH Input Board)
(Switch SW5 is set to S for low level alarms and set to W for high level alarms)
Case B - Opto-output circuit normally short circuit, open circuit both to trip
TR2
Opto-output 1
Odd Electrodes
(RH Input Board)
24685034
To alarm annunciator or
tripping device
+ VE
PL 2
1
2
3
4
Note:
To alarm annunciator or
tripping device
+ VE
PL 2
1
2
3
4
Note:
(Switch SW5 is set to W for low level alarms and set to S for high level alarms)
- VE
PL 2
External power must
be applied as shown.
See specification for
power requirements
- VE
PL 2
External power must
be applied as shown.
See specification for
power requirements
Opto-isolated Output Board Option
1
TR2
2
3
Opto-output 1
4
Even Electrodes
(LH Input Board)
1
TR2
2
3
Opto-output 1
4
Even Electrodes
(LH Input Board)
3c-11