Si-tex SP38, Installation And Operation Manual, Page: 64 / 193

Sitex SP38 Installation and Operation
Document PN 29010101 V1r0
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Power Failures
Some installations require separate monitoring for power failures. This can be accomplished with
the circuit in
Figure 42 , which utilizes two relays. The coil voltage of the relays should match the
supply voltage for the autopilot. The power for the Alarm Supply, which must be a separate,
dedicated supply from the autopilot supply, should match the voltage of the alarm.
Figure 42 – External Alarm, SW'D B- Output – with Power Fail Option
The alternative circuit, using Switched B+ ( SW'D B+ ) as the alarm output:
Figure 43 – External Alarm, SW'D B+ Output – with Power Fail Option