SCOPE COMMUNICATIONS UK LTD
PAGETEK PRO MK2
Ref: PTPROMK2INSTALLred
Page
20
of 27
Issue 1
v) MAINS FAILURE
a) In the event of mains power being removed from the system, this will be indicated on
the status display as “MAINS FAILURE”. The Mains PWR LED and display backlight will
go out and the yellow fault LED will light.
b) The system will now run on the backup battery supply, but is otherwise fully operational.
c) To prevent unnecessary intervention where there are temporary glitches in mains
power, the system will only activate the Common Fault output after 25 minutes of
continuous loss of mains.
d) Similarly, the system will transmit a “Mains Failure” message only after 25 minutes of
continuous loss of mains. This message may be received by a suitably programmed pager
or group of pagers if required (must be specified at time of ordering).
e) The conditions as in (a) will remain until mains power is restored, or until the battery
reaches its low voltage condition (after approximately 100 hours*), which will then be
indicated on the system status display as in (vi) below.
[* assumes battery was at full capacity immediately prior to the loss of mains]
vi) LOW BATTERY
a) In the unlikely event that the system has experienced continuous mains failure in
excess of 90 hours, eventually the battery will reach its threshold operating voltage
(11.5V). This will be indicated on the bottom line of the display as “LOW BATTERY” and
the yellow fault LED will flash. The “MAINS FAILURE” message will remain on the top line
of the display.
b) A “Low Battery” message will be transmitted, which may be received by a suitably
programmed pager or group of pagers if required (must be specified at time of ordering).
Note: to avoid the possibility of the battery dropping below its final voltage (approx.
10.8V, see manufacturer’s battery data sheet), the system should either have its
mains power restored, its battery replaced or be shut down shortly after activation
of the Low Battery warning.
c) Note that the Common Fault output will already have been activated to indicate the
original mains failure.
d) In the highly unlikely event that both the Mains Failure and Low Battery warnings have
been ignored, the system will normally continue working for at least a further 10 hours after
the Low Battery warning, after which it will display the message “SYSTEM SHUTDOWN”.
Even at this stage, the system will still attempt to transmit a Fire alert condition if sufficient
power remains.
Note: batteries discharged beyond their final voltage for long periods will no longer
be capable of holding a full capacity charge and should be immediately replaced.
e) Once mains power is restored, the system will recharge the battery to at least 80% of its
rated capacity within 24 hours and to its rated capacity within 48 hours.
