On-Line Diagnostics And System Error Messages; Self-Tests At 0.5 Second Intervals; Output Affected By Error; Table 9-3 On-Line Diagnostics And System Error Messages - Honeywell 9782 Series Operator's Manual

Conductivity/Resistivity Analyzer/Controller

9.4 On-Line Diagnostics and System Error Messages

Self-tests at 0.5 second intervals

On-line diagnostics are self-tests which are performed automatically as a background task every
1/2 second. The system error messages (displayed on the alarm stripe if a test is failed) are listed
in Table 9-3.

Output affected by error

In an error condition, the Analyzer will continue to perform all the functions it is capable of
except that the output signal(s) will go to 0%. (Output signal manipulation does not occur with
calibration failure or clock reset diagnostics.)

Table 9-3 On-Line Diagnostics and System Error Messages

SYSTEM ERROR
MESSAGE
A/D CONV FAILURE
CELL 1 OUT OF RANGE
or
CELL 2 OUT OF RANGE
CELL 1 TEMP ERROR
or
CELL 2 TEMP ERROR
CLOCK RESET
EPROM ERROR
RAM DATA CORRUPTED
RAM ERROR
RAM ERROR IN CPU
Note 1: Temperature compensator should be 8550 ohms at 25 C. If temperature compensator
fails, a conductivity instrument will be forced to its display range high limit. A resistivity
instrument will be forced to the low end of the range or zero.
9-4 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator's Manual
WHEN
TESTED
background faulty analog-to-digital converter
background Cell reading is out of range for
either the high or low limit of the
selected cell constant. The
cell's display will stop updating
until the condition and alarm
message clears. Instead, to
indicate an invalid display, the
display will alternately flash 0.0
and either the last known value
or the high end limit for the cell
constant.
background Cell temperature compensator
faulty
after power Clock is on, but time may be
failure incorrect, or
clock is off as a result of the
power failure.
at reset faulty EPROM
background data in non-volatile memory has
been changed by a fault
at reset faulty RAM
at reset faulty RAM in microprocessor
CONDITION CORRECTIVE
ACTION
Have instrument serviced.
Check cell to make sure it is
connected to terminals. Make
sure cell constant is correct for
expected conductivity range.
Check cell (see Note 1).
Reset the time,
or
if clock is off, turn it on and reset
the time.
Have instrument serviced.
Power down, check power supply
and wiring for high voltage
spikes. Have instrument
serviced, if necessary.
Have instrument serviced.
Have instrument serviced.
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