B. Ring Detection Only
The
LDB-3
must be placed between the
phone line and the terminal device (phone)
to be monitored. Connect the incoming line
to positions
1
and
2
and connect the terminal
device (phone) to positions
3
and
4
.
If the application requires off-hook (loop) and
ring detection, the
LDB-3
must be placed
between the phone line and the terminal de-
vice (phone) to be monitored. Connect the
incoming line to positions
1
and
2
, connect
the terminal device (phone) to positions
3
and
4
.
Connect the incoming line to terminal block
positions
1
and
2
as shown in the diagram.
No terminal device (phone) is required. In
this manner, the
LDB-3
can monitor for ring-
ing any place along the ringing line.
1 2 3 4 5 6 7 8 9 10 11
Z3Z
3
Z2Z
2
R
5
R
2
R
4
R
4
R
7
R
7
R
9
R
9
R
8
R
8
C
R
C
R
2
1
2
3
4
5
6
7
8
9
To C.O. Line or Analog
PABX/KSU extension
To Terminal Device/Phone
Disable/Info Switch Input
Relay Contacts
Switched 12VDC
(350mA maximum) Output
10
11
Normally Open
Common
Normally Closed
120V AC
Negative
12V DC
Adapter
(included)
Positive
Internal View of the LDB-3
DIP switch
2
is used for switching between different ring detection modes. In the
OFF
position, the relay and
switched 12VDC output will activate only while ring voltage is present and will turn off between rings. In the
ON
position, the relay and switched 12VDC output will remain on for up to 5.75 seconds after the ringing has stopped.
This allows the relay and 12VDC to remain on between rings of a standard ring cadence.
Note:
To use the Ring
Cadence Mode, ring detection MUST be enabled (DIP switch
1
-
ON
).
E. Ring Cadence Mode
C. Off-Hook / Loop Current Detection Only
D. Ring and Off Hook / Loop Current
Detection
The switched 12V DC output is a low current, 12-15VDC output that is turned on only while the ring/loop detect
relay is activated. This switched power output is ideal for lighting strobe lights or powering up any device that
draws less than 350mAmps. The positive side is available at terminal position 11, and the negative side is at po-
sition 10. Once all the line and load connections have been made, plug in the 115 V AC wall adapter, and replace
the cover.
Normally open and normally closed relay contacts are available at terminal block positions
7
,
8
,
9
. The contacts
are rated at .5A @ 125VAC/1A @ 30VDC. If contacts are driving an inductive load, place a suppression device
at the load to snub high voltage spikes.
F. Relay Contacts
G. Switched 12V DC Output
By connecting the Disable/Info Switch input of the
LDB-
3
to the “
Info
” switch of Viking’s
E-1600-20A
,
E-1600-
20A-EWP
,
E-1600-52A
or
E-1600-52A-EWP
Emergency
Phone (not included), any outbound calls initiated from
the “Info” button will not activate the loop detect relay.
This way, only the “Help/Emergency” outbound calls will
activate the relay. Cut one of the “
Info
” switch wires in
half and connect each end to
LDB-3
terminals 5 and 6
as shown in the diagram at the right.
Note:
The Disable
input is
NOT
polarity sensitive.
The “
Disable
” input can be connected to a remote switch,
contact closure, etc. for deactivating the
LDB-3
’s internal
relay. This can be useful to turn off the controlled device
(strobe light, camera, etc.) Use the diagram shown at the
right. If the relay has been activated by ringing, the switch
will deactivate the relay and ringing
must stop for a minimum of 6 sec-
onds before the relay can be re-
activated from a new incoming call.
VIKING
Model:
xxxxxxx
Viking Electronics, Inc. (715)386-8861
1531 Industrial St., Hudson, WI 54016
S/N:
XXXXXX
P/N:
xxxxxxx
1 2 3 4 5 6 7 8
9 10 11
Z3
Z3
Z2
Z2
R
5
R
2
R4
R4
R7
R7
R9
R9
R8
R8
CR
CR
2
Rear View of E-1600-20A
LDB-3
Z3
Z3
Z2
Z2
R
5
R
2
R4
R4
R7
R7
R9
R9
R8
R8
CR
CR
2
390 Ohm - 750 Ohm, 1/2 Watt Resistor
(Radio Shack part # 271-1114, 271-1115,
271-1116, 271-1117 or equivalent)
Momentary
Switch
LDB-3
1 2 3 4 5 6 7 8 9 10 11
H. Disable Feature
3
