Planmeca Compact I, Technical Manual

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Chapter G - PARTS REPLACEMENT & REPAIR
G-14 Planmeca Compact i
SUCTION SYSTEM RELATED
Technical Manual
4 SUCTION SYSTEM RELATED
4.1 Function of the PM Microvac II separating tank
Idle situation
Suction hose removed from the holder
Electrical function:
No control voltage is connected to any of the valves, suc-
tion motor stopped (if controlled by the unit).
Pneumatical function:
All the membranes are open.
Electrical function:
The suction motor relay connects on the Main control PCB
and the suction motor starts (if controlled by the unit).
Control voltage is connected to the microvac and flushing
valves.
Pneumatical function:
The microvac valve enables the suction closing mem-
brane to connect the vacuum to the upper chamber (and
to the suction hose). The intermediate membrane is
forced to expand by the vacuum in the upper chamber.
The pressure balancing membrane over the intermediate
membrane moves upwards and blocks the opening
between the upper chamber and the lower chamber.
Saliva and water begins to gather into the upper chamber.
Microvac valve
Suction closing
membrane
Intermediate
membrane
Pressure balancing
membrane