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VRDK1 TECHNICAL MANUAL
VER1.0
- All connections to mains voltages must be made to the current national standards (IEE
Wiring regulations)
- Install an appropriate fused spur or isolation switch to isolate the mains.
- Isolate the mains before carrying out any maintenance work on the system.
- All intercom and access control cables must be routed separately from the mains.
LOCK RELEASE
12V AC
~ ~
0.1uF capacitor
Safety Note :
An earth connection should also be fitted to the door panel stainless steel
facia using one of the studs provided.
CABLE SIZE GUIDE
AUDIO SYSTEM
Connections from door panel to telephone.
Connections
50m 100m 200m 300m 400m
1
0.25mm² 0.35mm² 0.5mm² 0.75mm² 1.0mm²
2
0.25mm² 0.35mm² 0.5mm² 0.75mm² 1.0mm²
3
0.5mm² 0.75mm² 1.5mm² 2.0mm² 2.5mm²
5
0.5mm² 0.75mm² 1.5mm² 2.0mm² 2.5mm²
6
0.25mm² 0.35mm² 0.5mm² 0.75mm² 1.0mm²
When ever possible connection 1(Tx) should be twisted with connection 3(Gnd) and connection 2(Rx) should
be twisted with connection 3(Gnd) as pairs.
Maximum acceptable resistance for terminals 1,2 & 6 = 10
Ω
and for terminals 3 & 5 = 3
Ω
Connections for power supply output to door panel and lock release connections. These
connections are shown heavily outlined on the wiring diagram.
50m
100m
Connections
0.5mm² 0.75mm²
The power supply should be located as close to the door panel as possible for best performance.
Maximum acceptable resistance for above cables = 3
Ω
TESTING THE INSTALLATION
- Check all the connections have been made correctly and then power up the system.
- Call all the apartments in turn. Check for call to the apartment, speech in both
directions and lock release.
- If the volume of speech needs to be adjusted, this can be done by adjusting the presets
on the rear of the amplifier at the door panel.
PANEL CARE
The door panels are manufactured from either 12 Gauge 304 grade stainless steel or
mirror finished brass. It is important that the facia is cleaned on regular occasions to
prevent dirt build up and tarnishing of the metal. A general household metal polish can be
used but care should be taken to follow the grain of the metal when polishing and also
avoid any polish build up around the call button which may prevent the button from
operating correctly.
L
ock release back EMF protection :
A
capacitor should be fitted across the terminals on
an AC lock release
as shown in the diagram
below to suppress back EMF voltages.
