Rosemount 890, Instruction Manual

Page: 61 / 96

T
ROUBLESHOOTING
748460-A
5-1
Rosemount Analytical
January 2000
5.1 ERROR CODE SUMMARY
In the Run Mode, the error codes described in Table 5-1 may appear on the display.
These messages also are shown on the STATUS display in a slightly different format.
Error messages in Table 5-1 are listed in order of priority.
Note:
The ERL error message takes precedence over other error messages [ER0 -
ER7] in the Run Mode screen.
Note: If any of the above error messages occur, software will restore previous
values. The analyzer is then operable under values resident before calibration.
T
ABLE
5-1. E
RROR
C
ODE
S
UMMARY
RUN MODE
DISPLAY
STATUS DISPLAY EXPLANATION
ERL [EL-LIN.COEFF ERR]
Either an improper linearization coefficient or a CAL GAS value larger
than fullscale has been inputted. See Section 5.6 for further information.
ERO
[EO-ZERO POT
LMTS]
Zero Potentiometer setting is such that more than
±
500 mV is required to
make a software zero. The zero potentiometer cannot compensate.
System must be balanced with iris adjustment. See Section 5.2.
ER1
[E1-R1 SP POT LMT]
ER2
[E2-R2 SP POT LMT]
ER3 [E3-R3 SP POT LMT]
Span errors for Range 1, Range 2, or Range 3. Software span is outside
limits so that the rum mode value is not between 51% and 100% of the
span gas value while in the Span Mode. Check gain settings.
ER4
[E4-ADC
SATURATED]
Signal into ADC is greater than fullscale rating. Refer to Figure 3-7 and
reduce the digital GAIN setting by one value, i.e. 16 TO 8, 8 to 4, 4 to 2
or 2 to 1. If the GAIN is initially on 1, switch from High to Low gain.
ER5 [E5-ZERO DRIFT]
Zero drift limit exceeded. To clear, recalibrate or toggle the drift limit
OFF and then ON.
ER6 [E6-SPAN DRIFT]
Span drift limit exceeded. To clear, recalibrate or toggle the drift limit
OFF and then ON.
ER7 [E7-GAIN TOO HIGH]
The combination of the preamplifier gain setting (HIGH/LOW) and the
gain setting in the RANGE sub-menu is producing too high of a signal.
Reduce gain.
[UV LAMP ERROR] UV lamp source current is low, generally indicating lamp replacement.