Viking ldb-2 Service Manual
LDB-2
LDB-2
Ring/Loop
Detector
March 23, 2000
The LDB-2 Ring/Loop Detector monitors an analog phone line
for ringing or an in-use condition. A built-in relay can be activated when either of these conditions are detected. This is ideal for
monitoring line status or for providing a visual indication of such.
When monitoring for ring, an internal pot can be adjusted to
allow the relay closure to stay on steady, or follow standard ring
cadence.
The LDB-2 comes complete with a 12 VDC power adapter, and
can also provide 12V DC power through its auxiliary 12V DC
output terminals.
Provide a Contact Closure on Ringing
or Off-Hook
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• Detects ring voltage and loop connect
• Screw terminal connections
• Wall mountable with foam tape (included) or
screws (not included)
• Auxiliary 12V DC output
• Adjustable time-out for relay closure
• Two sets of relay contacts provided
• Selectable NO (normally open) or NC (normally
closed) relay contacts
• Limited one year warranty
• Control a strobe light for ring indication
• Provide relay closures on ring and off-hook
• Trigger a security camera
• Trigger a tape recorder
• Phone “In Use” indicator
• “Dead Line” detector
Power: 120V AC to 12V DC adapter provided
Dimensions: 74mm x 53mm x 25mm (2.9” x 2.1” x 1.0”)
Shipping Weight: 0.4 kg (0.86 lbs)
Environmental: -26° C to 54° C (-15° F to 130° F) with 5% to
95% non-condensing humidity
Contact Rating: .5A @ 125V AC/1A @ 30V DC
Maximum Current Draw Auxiliary 12V DC Output: 350mA
Minimum Loop Current: 15 mA
Minimum Ring Voltage: 40Vrms
Ringer Equivalence: 0.5 A REN
Connections: 10 pin screw terminal block
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The relay contacts located at terminal positions 5,6 and 7,8 can be set
for normally open (N/O ) or normally closed ( N/C) by
repositioning JP1 and JP2 respectively (see diagram to the right).
A. Adjustable Relay Closure Time Out
The time out POT (see diagram to the right) can be adjusted from 2 to
6 seconds. Turn the time out POT counter clockwise to decrease the
closure time. Turn it clockwise to increase the closure time. When
monitoring for ring, turning the time out POT fully counter clockwise will
allow the relay closure to follow standard ring cadence, turning it fully
clockwise will allow the relay closure to be maintained during the entire
off time of the ring signal. When monitoring for loop, the relay closure
will be maintained while off-hook and will time out following an on-hook.
Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking Electronics, and its affiliates and/or
subsidiaries assume no responsibility for errors and omissions contained in this information. Revisions of this document or new editions of it may be issued to incorporate
such changes.
Fax Back Doc 408 ZF301290 Rev APrinted in the U.S.A.
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JP2
JP1
Power Supply Input
R7 Time Out POT
A. Mounting
The LDB-2 is designed to be wall mounted using either screws or the
included foam tape.
1. Remove the cover from the LDB-2.
2. Mount the unit on a wall, using either screws or the included foam
tape. Make sure there is easy access to the internal terminal
block. The internal board of the LDB-2 can be rotated exposing the
two mounting holes in the chassis.
3. Once mounted, swing the board back into position.
B. Ring Detection Only
Connect the incoming line to terminal block positions 1 and 2, as
shown in the diagram to the right. No terminal device is required.
In this manner, the LDB-2 can monitor for ringing any place
along the ringing line.
C. Ring and Loop Detection
If the application requires loop as well as ring detection, the
LDB-2 must be placed between the phone line and the terminal
device to be monitored. Connect the incoming line to terminal
block positions 1 and 2 and connect the terminal device to positions 3 and 4, as shown in the diagram to the right.
D. Relay Contacts
Relay contacts are available at terminal block positions 5,6 and
7,8. If the contacts are driving an inductive load, be sure to place
a suppression device at the load to snub any high voltage spikes.
VIKING
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MODEL: LDB-2
Mounting Hole
1 2 3 4 5 6 7 8 9 10
To C.O. Line or Analog
PABX/KSU extension
To Phone
(only required for loop detection)
Relay Contact (pins 5,6)
Relay Contact (pins 7,8)
Auxiliary 12V DC Output
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E. Auxiliary 12V DC Output
12V DC is available for low current applications. The positive
side is available at terminal position 10, and the negative side is
at position 9. Once all the line and load connections have been
made, plug in the 120 V AC wall adapter, and replace the cover.
B. Relay Contact Selections
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