6-6 REMOTE/AUTOMATED CONTROL
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6.2.5 Run Fault and Beam Good on the DB-37 Connector
The Run Fault and Beam Good are available for additional monitoring of the
operational state of the auto controller and associated power supplies. These
pins are described below in table 6-4.
A Run Fault occurs when the discharge fails to start or goes out in Auto Gas
mode. It also occurs if the operating parameters are out of range for more than
54 seconds. When a run fault occurs, the Auto Controller reverts to Standby
and a help code or error message is displayed on the front panel of the Auto
Controller. Use the help codes and error messages de
fi
ned in Diagnostics sec-
tion 7 of this manual to determine the cause of the Run Fault. The help code
or error message is cleared when the remote enable pin 36 is released from
common pin 7 or 8.
The Beam Good function gives a real time check of the operating parameters.
If the operating parameters are in range, the two Beam Good pins are shorted
together. If the operating parameters are out of range, then the beam good pins
are open.
The conditions for Beam good are: Discharge Voltage within ± 12.8 volts, dis-
charge current within ± 1.28 amps, the emission current must be at least 75%
of set point, and all gases within 50% of setpoint.
Table 6-4. Run Fault and Beam Good pin descriptions.
Pin
Number
Description
7
Common.
8
Common.
23
Beam Good 1. Shorted to pin 24 when the operating parameters are in
range.
24
Beam Good 2. Shorted to pin 23 when the operating parameters are in
range.
19
Run Fault. Outputs 5 volts when a run fault occurs, otherwise it outputs 0
volts. Referenced to common pins 7 or 8.
6.2.6 Description of the DB-37 pins
The DB-37 pin analog/digital interface has been described above by sorting
out the various remote operating options. Table 6-5 below is provided as a ref-
erence with a description of all the pins. The descriptions provided below are
