Philips LTC2272/50 Installation Instructions Manual page 7

4 INSTALLATION
4.1 Electrical
Model No. Rated Voltage
LTC 2272/60 120 VAC, 50/60 Hz
LTC 2272/50 220-240 VAC, 50/60 Hz
LTC 2276/60 120 VAC, 50/60 Hz
LTC 2276/50 220-240 VAC, 50/60 Hz
1. At rated voltage.
Power Disconnect. Units with or without
ON/OFF switches have power supplied to the unit
whenever the power cord is inserted into the
power source; however, the unit is operational
only when the ON/OFF switch is in the ON
position. The power cord is the main power
disconnect for all units.
4.2 Mounting
LTC 2272 Series and LTC 2276 Series models are supplied as
desk top units. An optional rack-mount kit, LTC 9101/00, is
available for rack mounting.
A bracket is supplied for use in place of the one provided with
the optional LTC 9101/00 Rack Mount Kit. See
ILLUSTRATIONS. If not rack mounting, the supplied
bracket may be discarded.
4.3 Cover Removal
WARNING: Removal of the cover should only
be performed by qualified service personnel--not
user serviceable. The unit should always be
unplugged, before removing the cover and remain
unplugged while the cover is removed.
The top cover is fastened to the case by two screws located on
the bottom rear of the unit. Once the screws have been
removed, the cover slides back and off the unit. See Top Cover
Removal.
Top Cover Removal
Nominal Power
8 W
8 W
9 W
9 W
Slide Cover Back
Remove Screws From
Bottom Rear Corners
(2) Places
S936A01AE
4.4 Video Inputs
LTC 2272 Series Only: Each of the four camera inputs have a
single BNC connector and are 75 ohm terminated.
1
LTC 2276 Series Only: For each of the four camera inputs
there are two BNC connectors on the rear panel. One of these
connectors is to be used as a camera input while the other
connector may be used as a looping output. It does not matter
which connector is used as the camera input and which is used
as the looping output. DIP switch S601 controls the 75 ohm
termination for each of the 4 video inputs. S601 is switched
ON for 75 ohm termination or OFF for nonterminated
(looping operation). The factory default is set for 75 ohm
terminated operation. These settings should only be done by a
qualified installer or service center. The cover must be removed
to make the DIP switch adjustments. See Cover Removal and
DIP Switch and Resistor Location - LTC 2276 Series
illustrations.
4.5 Monitor Outputs
The LTC 2272 Series provide a single video output which will
display a quad view of the video inputs.
The LTC 2276 Series provide two monitor outputs. The
VIDEO OUT is a full function output providing Sequence,
Quad, Full View, Freeze, Alarm, and Video Loss operations.
The QUAD VIDEO OUT provides a quad view, quad view
with freeze, and full view with zoom-freeze operations.
The monitor outputs must be terminated into a 75 ohm load.
If the monitor output line is looped through monitors or other
equipment, be sure the monitor terminations are set to Hi-Z.
Only the last unit on the line should have its termination set to
75 ohm.
4.6 Camera Phase/Update Rate
The LTC 2272 Series and LTC 2276 Series achieve a real-time
update rate (30 frames-per-second) when they are used with
line-locked cameras that have a phase error of less than 5
degrees. This can be achieved by adjusting the phase adjustment
on the individual cameras. The phase adjustment should be
made before power is applied to the VidQuad
phase adjustment is made after power has been applied to the
unit, the unit should be momentarily disconnected from the
power source then reconnected to the power source to
synchronize the unit with the cameras. The unit-to-camera
synchronization will automatically be initiated when a camera is
connected to an unused video input. If this procedure is not
followed, or if the cameras are not line-locked together with ± 5
degrees phase, the update rate of the unit will be one-half real-
time, or 15 frames-per-second.
1.3
®
unit. If the