Fault Finding; Error Messages - ABB 4690 User Manual

4690 Series
Turbidity systems

10 Fault Finding

10.1 Error Messages

If erroneous or unexpected results are obtained, the fault may be indicated by an error message – see Table 10.1. The majority of
problems are overcome by thorough cleaning of the flowcell optical windows and / or a sensor calibration.
Error Message Description and Remedy
Cal Fail
Indicates that the expected step change between a zero and span calibration was not produced by the
sensor (zero response from the sensor).
1. Repeat calibration.
2. If using a dry calibration standard, ensure that the optical windows on the dry standard are clean
3. If using solutions:
4. Check electrical connections to sensor.
5. Using a suitable voltmeter, check the sensor 12 V supplies, both at the analyzer terminals and
6. Check the analyzer's response to an electrical input by injecting 0 and 3 V into the following
Cleaner Fail
Indicates that the analyzer was unable to detect the correct operation of the wiper unit; either the wiper
unit did not rotate or failed to park in the correct position.
1. Check the electrical connections to the sensor.
2. Using a suitable voltmeter, check the sensor 12 V supplies, both at the analyzer terminals and
3. Check operation of the wiper unit by disconnecting the white lead from the analyzer terminal block
NV Memory Error
Indicates that the contents of the nonvolatile memory has not been read correctly during power up. To
rectify the problem, switch off the power, wait 10 seconds and switch on again. If the problem persists
contact the Company.
Table 10.1 Error Messages
IM/4690–EN Rev. A
and dry.
Check that the flowcell has been thoroughly cleaned and rinse well between solutions
Check both zero and formazine solutions
sensor junction box – see Table 4.1 on page 14 for details.
terminals and noting the reading displayed in
6.2.1, page 19):
Wall- / pipe-mount–ve to terminal 7 +ve to terminal 4
Panel-mount –ve to terminal 6 +ve to terminal 9
Small errors in displayed voltage can be removed by electrical calibration. Large errors indicate an
electronic fault.
sensor junction box – see Figs 4.4, 4.5 and 4.8 on pages 14, 15 and 17 for connection details.
(Cleaner Initiate signal) and touching it briefly to the 0 V terminal – see Table 4.1 on page 14 for
details. This initiates a cleaning cycle, that can be observed when the wiper unit is removed from the
flowcell.
in the
Sensor Voltage Operating
10 Fault Finding
page (see Section
35