REMOTE/AUTOMATED CONTROL 6-3
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Copyright © 2010 by Kaufman & Robinson, Inc., 1306 Blue Spruce Drive, Unit A, Fort Collins, CO 80524
Tel: 970-495-0187, Fax: 970-484-9350, Internet: www.ionsources.com
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Remote Gas Channel Setpoints using Auto Gas or Manual Gas Modes
The remote gas setpoints are not available when using the auto or manual
gas modes, instead the starting gas
fl
ows are established by program-
ming them from the front panel for each program. The gas for channel 4
is reserved for the hollow cathode. This gas
fl
ows continuously at the front
panel set point value regardless of the enable/standby selection. For pro-
cesses that require a minimum vacuum base pressure, this gas
fl
ow can
be disabled by connecting pin 15 (gas CH4 off) to common pins 7 or 8. See
the Hollow Cathode Electron source manual for the gas
fl
ow requirements
before and after the hollow cathode is started.
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Remote Gas Channel Setpoints Using the Gas Only Mode
When the Gas Only mode is selected from the front panel, the Auto Con-
troller continuously responds to the applied gas setpoints once the Auto
Controller is enabled.
6.2.3 Remote Analog Setpoint Option on the DB-37 Connector
The remote analog setpoint option allows active control over the setpoints
while the Auto Controller is enabled in the auto gas mode. The four stored
programs are not available with the remote analog setpoint option.
Switch the front panel from local to remote and also connect Remote set-
point pin 17 to common pin 7 or 8 on the DB-37. This selects the remote
setpoint options for both the DB-25 and the DB-37 ports. The remote ana-
log set points are applied to the analog pins described below in Table 6-2.
To enable the system, connect the remote enable pin 36 to common pin 7
or 8 on the rear panel DB-37 connector.
The starting gas setpoints are taken from the front panel when operating in
Auto Gas mode. The auto controller then automatically adjusts the gas to
maintain the program values for the discharge voltage and current, while
maintaining the ratio established by the starting gas setpoints.
