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ruption,
the first three CO/PBX
lines will auto-
matically
transfer
to single line telephones
(if
installed)
for emergency
communicatfons
(Re-
fer to Figure
500-6).
These
single
line tele-
phones
should
be equipped
with ringers.
They
can be MMF-type
instruments
or rotary
dial.
Connection
is made
on the
Power
Failure
Transfer
jack located
on the side of the KSU.
500.15
BEAD!3ET INSTALLATION
The Key Telephone
is designed
to operate
with
industry
standard
modular
headset
adapters
and operator
headsets.
To modify
a
Key Tele-
phone to support
an external
headset,
plug the
headset
adapter
cord Into the hands&jack
on
the Key Telephone
base.
Plug the telephone
handset
cord
into
the
headset
adapter
box
where indicated
by the headset
manufacturer's
instnlctions.
Then turn
to the Programming
section
of this
manual,
staffon
configuration
(Program
Code
02).
When
the headset
option
has been en-
abled
for a particular
station,
speakerphone
operation
is automatically
disabled
and such
features
as On-Hook
Dialing
and Handsfree
speakerphone
are rendered
inoperable.
How-
ever,
incorning
page/voice
announcements,
tone ringing
and background
music will still be
heard over the keyset speaker.
500.16
BATTERY BACK-UP UNIT (BBU)
The Battery
Backup
Unit IBBU) houses
two 12
Volt batteries
connected
in series which
pro-
vide 24 Volts of DC power.
The BBU contains
an AC input
cord whfch
provides
charging
power when the batteries
are not in use.
Bat-
teries are not included.
A 10 inch 14 gauge jumper
wire is provided
for
interconnection
of the
two batteries.
Four
adapter
wires (approximately
2 inch) are pro-
vided for matching
the exact battery
terminal
size. The BBU will interface
batteries
with 187
or 250 size male faston-type
tab connectors.
A
plastic
tiewrap
is provided
for securing
the
batteries
once installed.
Any UL recognfzed
battery
may be used with
the BBU. gel type batteries
are recommended.
The larger ampere
hour the battery,
the longer
it will take to recharge.
k
Capacity
The
following
table
shows
appmte
Battery
Backup
times for a fully charged
battery
to discharge
to 90 percent
voltage
under
different
load conditions:
Infinite
816 Eey Telephone
System
INSTALLATION
All Electronic
Key Systems
will begin
to
operate
intermittently
below a certain
in-
put voltage.
Typically
reliable
operation
will be maintained
to 90 percent
of full
voltage.
B. Dimensions and Weight
-
8 lnhfgh, 13.5
hwide,
7.75 indeep
-
Weight
without
batteries:
11 lb.
C. Specifications
-
Output
fused at 4A, 250 V
-
Current
limited,
constant
-
voltage
charger
-
Gel-type
batteries
-
Charger
float voltage is 27.6 V
-
Cut off voltage pofnt is 21 V
D. Power Requirements
-
Input:
117V ac, 60 Hz
-
Fused at 0.5 A. 250 V
E. Environment
-
Temperature:
70 to 78 F
-
Humidity:
5 to 90%
F.
Recharge Time
-
Time Required
to Recharge
batteries
that have been discharged
completely:
-
7AH Batteries
= 24 hours
-
l&I-I
Batteries
= 48 hours
G.
hstallation
-
Introducff
on
Refer to Figure 500-7 for the locaff on of the
input
socket.
The input
socket of the key
system must be a female Mate-N-Lok
lype
connector.
-
Installatton
Checklist
-
The following
items
are required
to
install
the BBU:
1. One BBU with wire kit (5 wires) and tie-
wrap.
2. Four
no.
12 pan-head
screws
(if wall
mounted).
3. Screwdriver.
4. Backboard
or wall shelf, if appltcable.
Issue
1.
January
1992
500-13
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