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Appendix E
E-5
Troubleshooting
The ADFM Analog Output Module performs a relatively simple function;
that of converting data from the ADFM's binary data format to an analog
current signal proportional to flow. The module will normally be installed
and configured by a trained technician, and should continue to function in-
definitely. The following troubleshooting information is provided in the
unlikely event that problems arise with the completed installation.
Table E-3:
Possible Cause(s)
Field wiring/Plant
equipment
Improper
configuration
DGH signal
generator module
failure
RS-232
communications lost
between ADFM and
ADFM Analog Output
Module
ADFM Analog Output
Module failure
ADFM failure
page E-12
Symptom: No analog signal received at plant equipment
Test/Corrective Action(s)
Disconnect field wiring from TB2, check for signal
Check continuity of field wiring
Test inputs of plant equipment using signal generator
Check position of switch SW2-2 (Rev B only)
Check position of switch SW2-3
Check position of switch SW2-4, 5, and 6
Check field wiring termination(s) at TB2
Test communications with DGH module(s) (restart computer
in MS-DOS mode if necessary)
Check/set parameters and calibration of DGH module(s)
Test DGH module(s) output using software
Test RS-232 link with ADFM using DB-9 connector P1-
ADFM
Check position of switch SW2-3
Check input power
Reset using switch SW1
Monitor LCD display for activity
Reprogram micro-controller
Check ADFM input power/batteries
Test ADFM communications
Reprogram ADFM, monitor real-time output
Verify that ADFM is set to output data serially
Verify that ADFM is not logging internally, or that adequate
recorder space is available
MGD Technologies, Inc.
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