valves V1~V5 and Programmable Logic Control
（
PLC
）
together with
Touch Screen Panel TP170.
The system is controlled by two modes: manually control or
automatically control.
When manually operation, Pumping, Wet or Dry gas filling can be
done by single Step operation.
When automatically
，
the system can run automatically step by step
following predefined requirements (including vacuum pressure limit,
Wet gas clean cycle counts, Dry gas clean cycle counts, Vent
Off-Delay.) No manually operation is necessary and running status can
be displayed through indicator light and high vacuum gauge. In the
automatic cycle
，
vacuum pump keeps running and merely various
valves need to be switched on or off as required.
Switching between automatic and manual control is processed by
pressing different touch switches
，
manually operations include Run-m,
Pumping, Fill wet gas, Fill Dry gas, Reset and Return touch keys.
Under auto mode it can be started by pressing Run-A touch key. Reset
key is used to break and reset when the system is running. P1~P3 are
display pressure/vacuum values state
，
which are pre-set
（
Note
：
zero
air-filling pressure limit for P1 is 30 psi
，
P2 means vacuum limit for
pumping conversion to next filling
，
P3
—
final vacuum pressure
value
），
and can be modified when needed
。
Cycle Value and Vent
4
