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Hydrastep 2468CB and 2468CD Manual 2468CB & 2468CD Dual Power Supply Version
24685034 2-27
Indication Fault(s) Analysis and Corrective Action
State 5
Bottom half of
fault LED
illuminated
One or more
LED pairs
alternating
between water
and steam
Electrode wiring or
internal fault
Odd numbered
electrode
connection open-
circuit or
short-circuit to
earth
Affected electrode
alternates
between water and
steam.
Incorrect wiring,
broken connection
or damaged cable
assembly
Check that all odd numbered electrodes indicating
water have the correct pair of conductors connected.
Check the connections to the right hand input board.
Rectify wiring if incorrect.
Check ac voltage on all odd electrodes immersed in
water with a true r.m.s. voltmeter. A voltage of less than
0.1V ac indicates a fault condition.
If wiring to all odd electrodes is correct and the
electrodes still give a voltage reading of greater than
0.1V ac and a fault is still indicated, carry out the
following procedure:
1. Remove both conductors from electrode 1. With the
conductors isolated from each other, the level
display should show electrode 1 as being
alternating between water and steam (green and
red).
2. With the conductors touching each other, the level
display should show electrode 1 as being in steam.
3. Repeat operations 1 and 2 for all affected odd
numbered electrodes until a faulty indication is
found.
The above procedure checks the electrode wiring. If the
display does not show the correct results, then check for
a break in either of the suspect electrode conductors.
Carry out repair to any faulty connection or substitute a
new conductor or cable assembly in place of the
defective item.
Dirt on electrode
Affected electrode
alternates
between water and
steam.
If the wiring checks carried out as described above have
not located a fault, then dirt on an electrode insulator
may be the cause of the problem giving an effective
short-circuit to ground.
Check all odd numbered electrodes alternating between
water and steam for dirt over the external insulator and
clean with a cloth as required.
Checking for dirt on the internal insulator of the
electrode requires the draining of the water column
(refer to the appropriate manual for the correct
procedure).
Once the water column is drained, check the ac voltage
on each odd numbered electrode using a true r.m.s.
voltmeter. Any electrode showing a voltage of less than
3V ac needs cleaning or replacement. Electrodes must
be removed from the column for inspection and
cleaning.
Note: The electrode insulator can be cleaned using a
clean cloth
Table 2.3 - Fault analysis/corrective action chart (continued)