NECTA SPA TECHNICAL MANUAL
“
SFERA
“
Manual
“ SFERA”
12 /
19
4 - POWER SUPPLY AND WIRING
Like all other NECTA products, the “SFERA” vending
machine is type-approved (or awaiting approval) by IMQ,
therefore all components and electric units are certified as
conforming to European directives, and all cables are fully
sheathed and provided with double insulation. The door
cables are sectioned and fitted with special connectors to
facilitate disassembly of the door.
All connectors for the vending machine control function
branch out from the power supply unit: Keypads, payment
systems, ratiomotors, heating elements, display, cooling
units, electronic cards.
The power supply unit transforms the grid electricity to 24 V
AC and the CPU board acts as rectifier and controller of
actuations to the power users.
All actuations are under extra-low safety voltage, while the
lamps and the cooling unit are controlled by means of
special relay cards at the grid voltage.
The power supply unit is housed in a removable galvanised
steel metal box for greater accessibility.
When opening the door a safety switch is deactivated,
disconnecting the power from all accessible parts.
The unit is protected by electrical interference suppressor
systems in conformity with the European directives.
The power supply unit houses a safety transformer for the
extra-low voltage, the grid fuses, the transformer secondary
winding fuses, the fluorescent lamps ballasts, the relay card
for controlling the cooling unit, the noise interference
suppressors and the safety switch.
Vending trays
connectors
Connectors to
the door
Main
connectors
and fuses
Safety
transformer
Bipolar safety
switch
Lamps
ballasts
Radio
interference
suppressor
Power cable
input from
the mains
Power supply unit being removed
Power supply unit in operating
position showing fuses and safety
switch with protective casing
Cooling unit
control relay
card
