Pelco Welder C784M User Manual

LDC100  
Auto Iris Drive Converter  
C784M (4/00)  
®
DESCRIPTION  
The LDC100 converts a DC drive auto iris lens to a video drive auto iris lens. The LDC100 has  
a built-in amplifier that increases the video signal to automatically operate the open/close  
commands of the lens.  
INSTALLATION  
To install the LDC100 refer to Figure 1 and do the following:  
1. Connect the LDC100 to the lens connec-  
tor on the camera.  
2. Connect the video drive lens to the con-  
nector on the LDC100.  
3. If the iris mode selector on the camera is  
set to DC, switch the selector to VIDEO.  
4. Use a screwdriver and adjust the ALC and  
LEVEL settings for the best picture.  
ALC–Allows a variable selection of light me-  
tering between average and peak levels.  
Level–Adjusts the brightness of the im-  
age projected on the monitor.  
CONNECT LDC100  
TO CAMERA  
Figure 1  
LDC100 Installation  
LENS  
VIDEO DC  
LEVEL  
ALC  
CONNECT LENS  
TO LDC100  
A L C  
L E V E L  
Table A  
Plug Side to Camera  
Wiring Connections  
Pin No.  
1
2
3
4
Vcc (8V-16V)  
N.C.  
Sig. (VS or V)*  
Gnd  
Receptacle Side From Lens  
Pin No.  
1
2
3
4
Damp -  
Damp +  
Drive +  
Drive -  
* VS=Composite video signal  
V=Video signal  
 

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