POWER SUPPLY NR REF. 18A2
GENERAL INFORMATIONS
7
POWER SUPPLY UNIT REF. 18A2
BASIC FEATURES
Power supply unit
ref. 18A2
it is a part of house
phone system. Apart from power supply unit, each
house phone system must consist of:
entrance panel with suitable loudspeaking unit and
push buttons.
Power supply unit
ref. 18A2
it is a product from the latest
generation of power supply units produced by MIWI-
URMET. It is equipped with overload protection and special
circuit which is responsible for quiet call signal heard in
entrance panel during the call (call feedback). The additional
triac is used to release electric lock.
TERMINALS DESCRIPTION
~12
voltage 12Vac used to backlight or to release
electric lock,
~0
ground for voltage12Vac;
0
ground;
MU
microphone output for house phones;
SU
loudspeaker output for house phones;
GP
loudspeaker output for entrance panel;
MP
microphone output for entrance panel;
G
tone generator;
LZ
door lock release line for house phones;
Z
electric lock;
SETTINGS
The power supply
ref. 18A2
is equipped with 2
potentiometers for adjusting external (on the right) and
internal volume (on the left).
Exchanging of the fuse is possible after taking the
cover of power supply off. Remember to switch off the
mains before performing this operation.
BLOCK DIAGRAM
n = number of house phones
TECHNICAL SPECIFICATIONS
Power supply
230 V a. c. 50/60 Hz
Power
10 VA
Working temperature
-5
°
C
÷
+45
°
C
Min.
Resistance
for
tone generator
> 20 Ohm
Protection
fuse T100mA
Dimensions (L x W x
D)
106 x 90 x 66 mm (6 DIN)
– without external cover
110 x 130 x 66 mm
– with external cover
