CIAS Elettronica S.r.l. Ed. 2.2
Installation Handbook page 35 to 43 ERMO 482
3.2 Equipment Connection to the Power Supply
Even if the equipment is Direct Current powered ( 13,8 V ), they still operate properly, but it is
advisable to power it by Alternating Current ( 19 V~ ).
3.2.1 Connection to the Power Supply
The connection between the equipment and the transformer must be as short as possible (less
then 4 meters), and the section of the conductor must not be less than 1.5 mm².. The
connection between the transformer and the 230 V mains will be as that of the previous one.
The power supply cables connecting transformer with equipment, must be of shielded type with
shield connected to ground. The connection between unit and the power supply must be
realised with cables of correct section, the cables section must be computed keeping in account
connection length and unit current absorption. For the power supply connection (Alternative
Current ) 19V~, to make connect term 1/2 on the terminal strep MS1 of the Rx circuit and 1/2 on
the terminal strep MS1 of the Tx circuit.
Use only safety transformers with the following characteristics:
primary voltage: 230 V~
secondary voltage 19 V~
minimum power 30 VA
Remark. Use only safety transformers (example Certified EN 60950)
Make sure to connect the body of the transformer to hearth tap.
The transformer connection to the main (230 V~), must be carried out through one circuit
breaker having the following characteristics:
bipolar with minimum distance between contacts equal to 3 mm
provided in the fix part of cabling
easily accessible
However laws and standards concerning installations of devices permanently connected
to the main (230 V~), must be strictly respected (in Italy law 46/90 and standard CEI 64-8).
3.2.2 Connection of stand-by Battery
Into each equipment heads there is the housing for an optional rechargeable back-up lead
battery (12 V – 1.9 Ah). The battery is charged by the internal power supply, through the red
and black fastons and wires connected to the terminals 1 and 2 of the terminal block MS1. The
provided protection fuse (against overload and/or battery polarity inversion) F1 is T2A slow-
blow type The back-up lead battery allows to the barrier head (TX or RX), at least 12 hours of
perfect working, in case of mains missing.
Remark. Package, of the optional standby battery, must have a flame class equal or
better than HB (UL 94 Standard)
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