24 volt DC output
Two terminals are provided to power external devices including a galvanic isolator.
The maximum current available is 100mA (see technical specification for detail). A
polyfuse protects the output against overload or short circuit.
Digital outputs
An independent digital output is provided for both alarms 1 and 2. These outputs
provide switching 24vdc at 100mA. These outputs are reset either during an alarm
condition or after an alarm condition by pressing the reset switch. If the reset switch is
not pressed then the output is latching.
Relay outputs
Relay outputs are provided for
Alarm 1
Alarm 2
Alarm 3
Fault
Inhibit
TWA alarm (see Options board)
All alarm relays offer normally open, common and normally closed contacts. The
fault relay is normally energised. All other relays are ‘energise on alarm’.
Each relay is distanced to permit connection to either mains or 24vdc potentials.
AC output
Three terminals are provided to power external devices. The output voltage is equal to
the input voltage. A single fuse (F5) protects the ‘L’ output. The ‘L’ output fuse is
rated at 500mA.
Inhibit jumpers
A single two pole jumper is provided to inhibit the alarms during servicing. A short
circuit across the jumpers initiates the inhibit function.
Note – any alarm relay energised will be automatically de-energised if the inhibit
jumper is used.
Issue 4 03/09/04
15 of 29
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