Instruction manual

Instruction Manual
760006-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-1
Model NGA 2000 Platform
SECTION 8
TROUBLESHOOTING
8-1 SYSTEM TROUBLESHOOTING
Most Analyzer module problems stem from
sample system issues. A lot of these are ad-
dressed in the NGA 2000 Reference Manual,
and in the Analyzer module manuals them-
selves.
The NGA 2000 Reference Manual also con-
tains operational details that should assist you
to diagnose faults not covered in this present
section or the Analyzer manuals themselves.
Each section of the NGA 2000 Reference
Manual contains specific troubleshooting tips.
This section will simply try to point out the
area of concern for a given symptom.
Platform hangs up on start up
Out of memory. Reset it. See System Setup
in the NGA 2000 Reference Manual. Also,
not enough RAM for a large system. Use the
Controller board with RAM expansion. Also,
an Analyzer module may have lost power or
connection during the initialization process.
Power down the system and try again. Check
each Analyzer module with the Platform one
at a time to see which one hangs up the sys-
tem.
Can’t enter menus
Network error or module gone dead (or an
earlier than V2.2 I/O Module). Check for
power failure for an absent module, bad con-
nection, or failed module. Upgrade an early
I/O Module. Also, excessive network traffic.
Reduce update rate - see the NGA 2000 Ref-
erence Manual section titled Response time.
If the LON length is greater than about ten
meters, make sure that you have LON termi-
nations in place.
Platform shows “No Data”
Analyzer module no longer responding.
Check its LON connection, power connection,
power fuse.. Open it up and see if the red
LED’s on its Analysis Computer Board are on
or blinking. If so, power it down and back up,
and if it still doesn’t communicate, replace the
board or the entire Analyzer module. Try
connecting the bad Analyzer module by itself
to the Platform using a new cable.
No analog output, or wrong output
Check the binding of the I/O module, and
check that you are monitoring the correct one.
In its diagnostic menus, check the analog out-
put of the I/O module. If it is reported as be-
ing OK, the problem is in the wiring or in the
recording device. See I/O module section.
Calibration problems
See the calibration I/O module sections of this
manual, and the zeroing and spanning sec-
tions of the NGA 2000 Reference Manual.
Analyzer stability problems
Check the Analyzer module power and
grounding, the ambient temperature, and the
sample system. Check for ambient gas in-
terference - CO
2
in the atmosphere, etc.
Check the exhaust pressure stability. Gener-
ally make sure that the environment is satis-
factory before assuming that the Analyzer
module is at fault. See the NGA 2000 Refer-
ence generally, and the Analyzer module
manuals in particular for further hints.
Analyzer Linearity Problems
See the appropriate sections in the NGA 2000
Reference manual.
User programmed data is lost after mo-
mentary power loss to Platform
The Controller board in the Platform uses a
long life lithium battery to maintain user pro-
grammed data in the event of a power loss.
The battery voltage must be 3.38 VDC or
greater for proper operation. If the battery
voltage is less than 3.38 VDC it must be re-
placed by qualified service personnel or the
Controller board replaced by the user.