TECHNICAL INFORMATION
23/24
87-900-053-01 (
F
)
OPERATION
Make all vacuum manifold and electrical connections
and refer to the ion pump instruction manual prior to
operating the MiniVac controller.
NOTE
The accessory P001 connector should be left in
position including the jumper between pin 3 and 7 if no
external connection has been made.
For small ion pumps, up to 8 l/s:
with a roughing pump, establish a rough pressure
suitable to start the ion pump.
For medium ion pump (20 l/s to 60 l/s):
establish a pressure lower than 10
-5
mbar/ Torr.
For large ion pumps (120 l/s to 400 l/s):
establish a pressure lower than 2 x 10
-6
mbar/Torr.
•
Plug the controller power cable into a suitable
power source.
•
Place the ON/OFF switch in the ON position.
•
Monitor the VacIon pump current and the controller
high voltage output by watching the LED lit, then
read the corresponding current/voltage value (e.g.:
if the third LED is increasing its brightness it
means that the pump current is between 2 and 3
mA and the high voltage output is between 5 and 4
kV).
•
If only the first LED of the bar graph is lit, the
current drawn by the pump is less than 1 mA and
the voltage output is 5 kV.
•
If ten LEDs are lit, the current drawn by the pump
is 10 mA and the voltage output is 2 kV.
•
For the correct determination of the voltage value,
use the voltage vs current diagram shown in the
figure “MiniVac Controller Rear Panel Controls”.
Pressure Determination
Pressure at the inlet flange of a VacIon pump is
proportional to the current drawn by the pump.
To determine the pressure of the inlet flange of the
VacIon pump, determine the pump current displayed
on the front panel or read the recorder output
(especially for current lower than 1 mA), and find the
corresponding pressure value from the current vs
pressure curve of the relevant VacIon pump.
Power Failure
In the event of a power failure (momentary or long
period) the controller is switched off. When power is
restored, the controller will automatically restart.
Remote Control Mode Operation
It is possible to remotely switch onb and off the high
voltage using a permanent contact connected to pins 3
and 7 of J001 accessory connector with the mains
power ON/OFF switch to ON.
