Alarm Outputs - GE Optica Operator's Manual

Chapter 2. Installation
2.4.1a Additional Voltage Outputs
It is possible to use either analog current output as an additional voltage output by connecting a precision resistor from
the current output to its return. A voltage will be produced equal to the output current times the load resistance. To
produce a voltage output range of 1 to 5 volts, connect a 250 ohm resistor (0.1% tolerance recommended).
Using a 250 ohm resistor, the voltage output is calculated by:
yielding an output voltage of 1.92V for this example.

2.4.2 Alarm Outputs

Each alarm output connects to the contacts of a 5-Amp, Form C (SPDT) relay.
Make connections as follows:
•
For normally open contacts, connect to NO and COM.
•
For normally closed contacts, connect to NC and COM.
Any available parameter can be used to control an alarm relay by programming the parameter name and its threshold
values. An alarm can also be programmed to monitor the state of the Control,
Chapter 4, 5 or 6 for programming instructions.
Both Upper and Lower threshold values are programmed for each parameter. These values designate an alarm band.
How they are used depends on the programmed alarm type. Details are shown in "Inner Band Alarm" on page 17 and
"Outer Band Alarm" on page 17.
16
(
T T
–
actual lower
--------------------------------------- -
=
V
out (
T T
–
upper lower
( )
23 0
–
×
-------------------- -
4
+
( )
100 0
–
)
× ( )
5 1 1
– +
)
1 1.92V
=
Balance, or Service indicators. See
PACER
Optica™ Operator's Manual