D9000/D7000 Series Operation & Installation Manual
Page 15
74-07692-000-C 4/97
Power Supply
Primary Power
Terminals
1
2
Primary (AC) Power Circuit
A 16.5 VAC, 40 VA internally fused transformer
(Radionics model D1640) is the primary power
source. The AC power circuit provides 1.9 Amps
of rectified AC power. The panel reserves 500
mA of this power for internal operations leaving
1.4 Amps for powered devices.
Transient suppressors and spark gaps protect the
circuit from power surges. This protection relies
on the ground connection at terminal 10. Make
sure you connect terminal 10 to a proper ground.
See
Connecting Earth Ground in the Installation
section
.
AC Power Failure
The system indicates an AC power failure when
the power at terminals 1 and 2 is missing. The
AC Fail Time program item sets the number of
seconds that AC must be missing before the
panel acknowledges the failure and the number
of seconds after the power returns before the
panel acknowledges the restoral of power.
You can program
AC Fail Time from 1 to 90
seconds. The Radionics default sets
AC Fail
Time at 15 seconds.
Installing the Transformer
Do not short the terminals of the transformer:
Shorting the terminals opens the internal fuse
causing permanent failure. Connect the
transformer to terminals 1 and 2 of the panel
before plugging it into the power source.
Use 18 AWG (minimum) wire to connect the
transformer to the panel. Wire length should be
kept as short as possible. Maximum length is 50
feet.
AC wiring can induce both noise and low level
voltage into adjacent wiring. Route phone and
sensor loop wiring away from any AC conductors,
including the transformer wire. Route data wiring
away from AC and phone wiring.
Connect the battery and then plug in the
transformer: Radionics recommends that you
always connect the battery first and then plug in
the transformer. Instructions for
Installing the
Battery appear on the next page.
Only plug the transformer into an unswitched,
120 VAC, 60 Hz power outlet. Secure the
transformer to the outlet with the screw provided.
D8004 Transformer Enclosure required for fire
systems: Use the D8004 Transformer Enclosure
for the D1640 transformer in fire and combined
fire/burglary applications. Check with AHJ on
mounting transformers on specific circuits.
Secondary Power
Terminals
4
5
Secondary (DC) Power
A 12V, 7 Ah (up to 14 Ah) sealed lead-acid
rechargeable battery (D126) supplies secondary
power for auxiliary and alarm outputs, and
powers the system during interruptions in primary
(AC) power.
Lead Acid Batteries ONLY: The charging circuit
is calibrated for lead-acid batteries. Do not use
gel-cell or nicad batteries.
Extra Batteries Increase Back-up Time: To
increase battery back-up time, connect a second
12V, 7 Ah battery in parallel to the first battery to
form a 12V, 14 Ah battery. Use a D122 Dual
Battery Harness to ensure proper and safe
connection.
Installing the Battery
Place the battery upright in the base of the
enclosure. Locate the red and black leads
supplied in the literature pack. Connect the black
battery lead to terminal 4, and then to the
negative (-) side of the battery. Connect the red
battery lead to terminal 5, and then to the positive
(+) side of the battery.
Warning, High Current Arcs Possible: The
positive (red) battery lead and Terminal 5 can
create high current arcs if shorted to other
terminals or the enclosure. Use caution when
working with the positive lead and terminal 5.
Always disconnect the positive (red) lead from
the battery before removing it from terminal 5.
Replacement
Radionics recommends battery replacement
every 3 to 5 years under normal use. Exceeding
the maximum output ratings, or installing the
transformer in an outlet that is routinely switched
off, causes heavy discharges. Routine heavy
discharges can lead to premature battery failure.
Record the date of installation directly on the
battery.
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