How to use the Power Fail Input of a DV-200 unit

Each Davicom unit has a Power Fail (P.F.) input. The main purpose of this dedicated input is to monitor the Utility Power status using a 9 Volt AC/DC adapter that comes with every Davicom unit.

In order to get the most out of this input, and even more importantly from your Davicom unit, the unit should be powered from a power source that is running off a UPS (Uninterruptible Power Supply).

This way, if a power outage occurs, the Davicom unit (as well as other on-site equipment) would be kept running by the UPS and stay accessible remotely while a power outage alarm would be triggered in the Davicom. Based on this alarm, programmed actions could be made by the unit, like the sending of emails.

Since the P.F. Input activity is logged by the Davicom, users could get data about the outage by looking at the log entries to see what events and/or actions occurred around the moment the power outage happened.

Figure 1 shows one possible set up. Here, a UPS-Fail output is available from the UPS to monitor its overall health, and the Utility power is monitored thru the Davicom Power Fail input. Such a setup allows excellent power monitoring and can prevent important outage.

Figure 1: Both UPS and Utility Power are monitored.

If no UPS-Fail output is available from the UPS, a setup such as the one in Figure 2 is also possible.

Figure 2: Utility Power and a UPS with no fail output connected to a Davicom.

Another possible setup is one where a generator is used as backup power source. A UPS may be included, which would allow to have zero dead-time during the switchover from the utility power to the generator.

Figure 3 shows such a setup. Status of generator and UPS could be monitored by the Davicom unit if such outputs were available on them.

Figure 3: Utility Power and a generator provide constant power to the site’s equipment, while a UPS maintains power during the switchover period.
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