Cebora SPOT 3500 Service Manual page 5

CEBORA S.p.A.
the previous time, before the pause. This generating cycle is automatically repeated as long as
the start button is held down.
In the third instance, the power source delivers an output voltage adjustable via potentiometer
(3) on the front panel, without any time limit, for as long as the start button is held down. In this
case the output voltage is adjusted by partializing the waveform of the mains voltage applied to
the primary circuit of the transformer (26).
In all 3 cases, after the start button is pressed, the static switch (14) begins conducting in
synchrony with the mains voltage, thus it engages simultaneously with the maximum peak of the
sine wave of the supply voltage (see fig. 5.2.1), to avoid saturating the transformer (26).
For the same reason, the output time in automatic mode is determined by counting a number
of half cycles of the mains voltage, always even and complete, and current delivery always ends
with the half cycle opposite the one first used for output.
The signals processed by the electronic board and present at its connectors are listed in the
table in chapter five of this manual.
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