United Security AVD-2010 - Manual (Page 13)

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Please follow the configuration drawings on page 6 and enlarged insert below to correctly operate the Power Monitoring
System (PMS). The PMS becomes active when AC line voltage is off during a blackout or brownout lasting more that 2
seconds with the jumper on the back set to INSTANT; this feature may be very important in critical applications involving
freezers and other devices that depend on uninterrupted 120VAC line voltage. By selecting the DELAYED mode, “AC
POWER OFF” is reported after 15 minutes, only if line voltage remains absent during this period and battery power is
adequate to keep the dialer fully functional. With AC off for an extended period, perhaps as long 24 hours or longer, bat-
tery voltage may ultimately drop to 9V and below, at which time the “BATTERY LOW” message will be sent. Even
though battery has dropped below 9V, the dialer remains functional to less than 8V, hopefully long enough to alert main-
tainance personnel to correct the problem. As soon as AC power is back on anytime during the standby period, the “AC
POWER RESTORED” message is sent and no further action is required
.
Example (see insert on right side)
In this example CH1 position is set to ON, assuming that you’ve pro-
grammed CH1 to trigger the dialer on a normally open (N.O.) condi-
tion. If, on the other hand, you’ve decided not report a power
fail/restore condition when CH1 is opened, simply set the switch to
OFF. In this example if you choose to activate the dialer on a nor-
mally open (N.O.) input, CH1 switch must be to the OFF postion to
report a power/fail condition. Likewise, if you do not want to report a
power fail/restore, then set CH1 switch to the ON position.
Rule of thumb:
a. To enable channels to trigger on a power fail/restore condi-
tion, set the corresponding switches to agree with the way the
channels are programmed.
b. To prevent channels from triggering on a power fail/restore
condition, set the corresponding switches opposite the way
the channels are programmed.
Note:
For unused channels, you may set those switches in any position. REAR VIEW DETAIL
Sequence of operation
It’s important to note that the sequence in which power fail/restore notification takes place always starts with CH1. Sub-
sequent channels, programmed or not, will be serviced in ascending order. Because of this orderly progression, CH1 wil
always be the first to trigger the dialer on a power fail/restore condition and must therefore be the primary channel if time
of reporting is most urgent. Even though the reaction time of the dialer to an AC off condition is about 2 seconds, an un-
avoidable delay of up to 30 seconds can be expected before delivery of the message. On average, about 60 to 80 seconds
are required for each channel to be serviced.
What to expect when a power/fail message is initiated along with the user OGM
When the dialer is activated by a power fail/restore condition, the user-programmed OGM immediatley after the custom-
ary “HELLO” will be replaced in part by one of the power fail/restore messages. The three factory-programmed messages
“AC POWER OFF”, “BATTERY LOW”, and “AC POWER RESTORED” are preceded by a series of beep tones and are
repeated twice. The duration of each message including beep tones is 4 seconds. Therefore, the first 8 seconds of the user
OGM will be suppressed, followed by the remaining portion. Depending on the number of channels programmed, it’s rec-
ommended to split the user OGM into an ID plus OGM(s). For example: If only 2 channels (i.e. CH1 and 2) have been
designated to report a power fail/restore condition, pick the ID plus 2 OGMs option and try limiting the ID time to 8 or 10
seconds and OGMs 1 and 2 to 10 seconds each. Always test the unit by momentarily disconnecting the AC2-P adaptor
and listen to the message.
POWER FAIL/RESTORE NOTIFICATION