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INITIAL OPERATION 4-3
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be cleared when the Auto controller is turned back on. A shut off signal
for the hollow cathode gas is also available for remote shut off without
turning off the Auto Controller.
During startup of the hollow cathode, the automatic sequencing of the
Auto Controller will raise the gas
fl
ow to 100 sccm to ignite the hollow
cathode in the Auto gas or Manual gas operating modes. After ignition in
these two modes, the gas controller will then drop the
fl
ow to the operating
fl
ow. The recommended operating
fl
ow is 10 sccm for up to 10 amps of
cathode emission current. One sccm should be added to this
fl
ow for
each additional ampere of emission current above 10 amps. Operation
is possible using less than the recommended minimum, but will reduce
the lifetime of the hollow cathode insert. Contact KRI for advice on using
less
fl
ow for the hollow cathode if necessary.
The gas
fl
ow may be adjusted by selecting the gas channel and turning the
knob on the front panel of the gas controller before the auto controller is
enabled. For the initial operation, leave the gases set at the programmed
setpoint(s).
4.3.1.3 Keeper Current Setpoint
The setpoint for the keeper current in amps is shown in the display labeled
Keeper Amps on the Keeper Power Supply. Notice that the yellow setpoint
LED below the display is on to indicate that the setpoint is being viewed.
Once the Auto Controller is enabled, the run value will be displayed and
the green run LED will be on.
The keeper current setpoint can be adjusted by turning the Setpoint Adjust
knob on the front of the Keeper Power Supply. Note: If the emission
current is set to less than 0.5 amps, then it may be desirable to increase
the keeper current to 2.0 amps to promote longer cathode lifetimes. For
the initial operation, leave the keeper current at the 1.5 amp setpoint.
4.3.1.4 Emission Setpoints
The setpoints for the emission voltage in volts and the emission current
in amps are displayed on the front panel of the Emission Power Supply
in the displays labeled Volts and Amps. Notice that the yellow setpoint
LED below the display is on to indicate that the setpoint is being viewed.
Once the Auto Controller is enabled, the run values will be displayed and
the green run LED will be on.