WARRANTY
All fiber optic transmission systems, products and accessories
manufactured by Liteway, Inc. and it’s subsidiaries are fully tested
prior to shipment and are warranted against defective materials
and workmanship for a period of five full years from the date of the
original shipment. Should a problem occur, a Return Material
Authorization Number (RMA) must be obtained from Liteway Inc.
at (516) 931-2800 and the item returned to Liteway, Inc. 166
Haverford Road, Hicksville, NY 11801, USA, prepaid. Liteway Inc.
will then, at its option repair or replace the defective item.
Liteway, Inc. maximum liability under this warranty is limited to the
cost of the defective item only. No contingent liabilities of any kind
are either assumed or implied.
Any items returned to Liteway, Inc. that have been misused,
abused, damaged, modified, connected or adjusted in any way
contrary to the instructions furnished by Liteway, Inc. or repaired
by unauthorized personnel will not be covered by this warranty.
Any non-warranty repairs required will be quoted at the current
rate for such services.
!
CAUTION ! AVOID DIRECT EXPOSURE TO BEAM.
All –5, -7, -8, and -9 Models use laser diodes. These solid-state
laser diodes are located in the optical ports of these units. Laser
diodes produce invisible radiation that may be harmful to human
eyes. Never look directly into the optical port of any fiber optic
unit designed to operate with single-mode optical fiber.
NOT FOR LIFE SUPPORT SYSTEMS
Liteway, Inc. does not authorize or warrant any of its products or
accessories for use in critical life support systems or applications
of any kind.
© Copyright 2017 Liteway, Inc. 107500 Rev F
Important Notices
OPERATING INSTRUCTIONS
Video Loss Detector;
Models;
VLD-3002 Dual Channel
VLD-3001 Single Channel
VLD-1001 Single Channel Sync only
The VLD-3002, VLD-3001, and VLD-1001 provides alarm indication when
there is a loss of video sync, when there is an extended period of black
(obstructed camera lens) or white (intentional blinding camera video
signals). The standard versions have a 3 second response time while the –H
versions have 0.5 seconds response time.
Technical Specifications
Compatibility NTSC or PAL
Video Bandwidth DC to 30 MHz
In/Out Signal Level 1 volt peak to peak
In/Out Impedance 75 ohms
Black level alarm adjustment 100mV to 700mV
White level alarm adjustment 100mV to 1V
Differential Gain 0.1% maximum
Differential Phase 0.1º maximum
Signal / Noise Ratio 85 dB min
Response Time Standard
Version
Response Time –H Version Less than 0.5 seconds
Relay Contacts 0.5 A @ 125 VAC; 1.0 A @ 24 VDC
Indicators Power, Alarm
Channel indicators Signal, White, Black
Power Requirements 11-24 VAC/DC @150 mA
Temperature Range -35º to +75ºC
Physical Size (mm) 5.0”(127)L x 1.0” (25.4)W x 3.0”(7)D
All specifications are subject to change without prior notice.
3 seconds typical
Installation Instructions
The VLD-3002 is a dual channel unit. For each channel there are:
Signal, Black, & White level Indicators; Adjustable trigger points for
black and white alarm levels; and a normally open relay contact that
closes on an alarm condition.
The VLD-3001 is a single channel version of the VLD-3002. The
VLD-1001 is a low cost single channel units which only detects video
presence only and not black/white levels. Below is a typical
application of the VLD-3002.
VLD-3002
Camera 1
Alarm
Camera 2
Contacts
Typical Video Loss Detection Application
If the video loop through is not used, you must terminate the unused
loop through connector with a 75 ohm terminator.
Adjustments
Black level adjustment is used to sense a blocked camera lens or
loss of scene illumination. Apply a video signal with the darkest
acceptable scene. Slowly adjust the Bk control until the BK threshold
indicator just lights. Now turn the Bk control in the reverse direction
until the BK threshold indicator just turns off. Any lower level scene
will trigger the alarm.
White level adjustment; is used to sense a bright light shining into
the camera or an unusually bright change of scene. Apply a video
signal with the brightest acceptable scene. Slowly adjust the Wh
control until the Wh threshold indicator just lights. Now turn the Wh
control in the reverse direction until the Wh threshold indicator just
turns off. Any brighter level scene will trigger the alarm.
There is no adjustment for the signal (sync) channel. This alarm will
activate when the input video signal drops to 0.5 volts (pp) or less.
107500 Rev F
1
Monitor
2
Monitor
Indicator Lights
Indicator Lights when
Pwr Proper power is present.
Alm
There is a video loss or threshold violation
condition present.
Sig A video signal is present.
Wh* Video is above the White level threshold.
Bk* Video is below the Black level threshold.
*not present on the VLD-1001 model which detects only sync.
Note that the Alm indicator will only be off it there are no loss of video
or threshold violations on both channels for the VLD-3002
Power Terminal Block Connections
Pin Function
Alarm output for use with optional Alarm
1
Sensing Unit ALM-1000. No other connections
should be made to this terminal
2 +11 to 24 DC or AC Volts input
3 AC or DC return (Common to Housing)
Relay Terminal Block Connections
Pin Function
Normal Open contact channel 1; connects to
1
pin 2 when an alarm condition on channel 1
Normal Open contact channel 1; connects to
2
pin 1 when an alarm condition on channel 1
3 Case Ground
Normal Open contact channel 2; connects to
4*
pin 5 when an alarm condition on channel 2
Normal Open contact channel 2; connects to
5*
pin 4 when an alarm condition on channel 1
* Only present on the two channel model, VLD-3002
Be certain to check all connections and voltages before applying
power. Make sure the removable terminal blocks are fully seated.
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