34
24. External error:
– ClO
2
production is aborted.
– Alarm relay activated.
– Controller stops ClO
2
dosing
pump until fault is eliminated.
An external device that may be connected to a
"fault
input" (terminal 53/54) indicates a fault.
a) External device.
Check the external device.
b) Cable to the external device.
Check the cable to the external device.
Replace, if necessary.
c) Control system.
Call Service to replace the control system.
25. Annual maintenance due:
– ClO
2
production proceeds.
Call Service.
The alarm message disappears if
maintenance has been enabled.
26. Maintenance date exceeded – stop
system:
– ClO
2
production proceeds.
Stop the system.
Call Service.
27. Empty signal reservoir tank:
– ClO
2
production proceeds.
– Warning
relay activated.
– Controller stops ClO
2
dosing
pump after 20 seconds until fault
is eliminated.
This message is displayed in the following
situations:
a) During "once" operation, if no other
process is running (no fault).
Check the operating mode. In "once"
operating mode, this is not a fault.
b) If the dosing pump pumps the reservoir
tank empty before the final chlorine dioxide
is available in the reactor.
Call Service. If the message appears in every
cycle, the controller must be reset.
In the monitoring menu, check the measured
value under SERVICE > MEASUREMENT.
In the SERVICE > CONTROLLER menu,
check the displayed parameter.
In the SERVICE > WATER FLOW METER
menu, check the displayed values.
c) Faulty water sensor.
Check the water flow meter.
Replace, if necessary.
d) Drain cock at the reservoir tank open.
Close the drain cock.
e) Measuring cell
(for setpoint and combined controllers
only).
Check the measuring cell.
Call Service to replace the measuring cell.
28. Reactor control fault:
Plausibility check float switch in the reactor.
– ClO
2
production is aborted.
– Alarm relay activated.
a) Float switch.
Call Service. Check the float switch in the
reactor in the TEST LEVEL menu. Replace, if
necessary.
b) Control system.
Call Service. Replace the control system, if
necessary.
29. Reservoir control fault:
– ClO
2
production is aborted.
Plausibility check float switch in the reservoir
tank.
– Alarm relay activated.
a) Float switch.
Call Service. Check the float switch in the
reservoir tank in the TEST LEVEL menu.
Replace, if necessary.
b) Control system.
Call Service. Replace the control system, if
necessary.
30. Current input fault:
– ClO
2
production proceeds.
– Alarm relay activated.
– Combined and setpoint controller
stop.
Wire breakage, current input 1.
Occurs in the following situations:
•
If a water flow meter is connected, and the
signal exceeds the full-scale value of
20 mA.
•
If a water flow meter with 4-20 mA is
selected, and the signal falls below
3.8 mA.
In case of this fault, the controller is also
stopped (proportional and combined
controllers only).
a) Water flow meter.
Check the water flow meter.
b) Current input/control.
Call Service. Check the current input and
control.
Supply with a defined current between 0 and
20 mA, and compare with display of
SERVICE > WATER METER menu.
In case of damaged control, call Service.
c) Cable breakage between water flow meter
and controller.
Call Service to replace the cable.
d) Water flow meter is connected with 0-
20 mA, but set value is 4-20 mA.
Call Service to correct the software setting.
Error message if applicable
system reaction
Cause
Remedy
