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GA0383P02 Rev. C
beyond the differential alarm level. Press the ENTER key to save your changes and return to
the SETUP MENU. Press the FN key to discard changes and return to the SETUP MENU.
Setting the Differential Alarm Level
The differential alarm level determines what electrical output from the cloud chamber
detector will trigger an ALARM indication. The differential alarm level is expressed as a
percentage of full scale. An ALARM indication is given when the generator output level
exceeds the ambient output level by a value greater than the differential alarm level. The
factory default value is 50 percent. The differential alarm level can be changed by selecting
DIFFERENTIAL ALARM from the SETUP MENU.
When DIFFERENTIAL ALARM is selected, the differential alarm level is displayed on the
LCD display. Press the UP ARROW key to increase the value; press the DOWN ARROW
key to decrease the value. The value cannot be decreased below the differential warning
level or increased beyond 99 percent. Press the ENTER key to save changes and return to
the SETUP MENU; press the FN key to discard changes and return to the SETUP MENU.
About the Faults Log
· The Faults log traps these error conditions: I/O Read Error, I/O Write Error, COM1 RX
Overflow, COM1 Tx Overflow, Bad Command Checksum, Received Unknown
Command, Alarm Relay Fault, Trouble Relay Fault, Ambient Flow Fault, Generator Flow
Fault, Vacuum Fault, Photocell Fault, Cycle Fault, Water Fault and Power Fault.
· An I/O READ ERROR is logged when a read error is detected in the communication
channel that connects the processor and I/O board.
· An I/O WRITE ERROR is logged when a write error is detected in the communication
channel that connects the processor and I/O board.
· A COM1 RX OVERFLOW is logged when the remote computer sends data faster than
the GCM-A can process it. It usually indicates a problem with the flow control setting on
the remote computer.
· A COM1 TX OVERFLOW is logged when the GCM-A sends data faster than the remote
computer can process it.
· A BAD CMD CHECKSUM is logged when the GCM-A receives a command that was
corrupted during transmission.
· A RCVD UNKNOWN CMD is logged when the GCM-A receives a command from the
remote computer that it does not understand. It usually indicates that the software
version of the remote control software is newer than that of the GCM-A.
· A POWER FAULT is logged when the measured voltage of one or more of the power
supplies is out of specification.
· An ALARM RELAY FAULT is logged when one of the three alarm relays is not
functioning properly.
· A TROUBLE RELAY FAULT is logged when there is a problem with the warning, flow
trouble or system trouble relays.
(Setting the Differential Warning Level, cont’d)
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