Illogical Switching Sequences; What To Do When - Kessel aqualift f Installation, Operating And Maintenance Instructions

8. Warnings, Errors and Troubleshooting
8.5 Illogical switching sequence
The control unit monitors the pump ON and Alarm ON
• levels as well as each switch position (open or closed) and
• properly timed switching sequence (closed and opened)
depending on the wastewater level.
The correctly timed sequence is as follows:
• Wastewater level reaches ON level
- On level switch closes
- pump turns on
• Wastewater level falls below ON level
- On level switch opens
- pump turns off or
• Wastewater level reaches ON level
- On level switch closes
- pump turns on
• Wastewater level reaches ALARM level
- Alarm level switch closes
- pump remains in operation
• Wastewater level falls below ALARM level
- Alarm level switch opens
- pump remains in operation
• Wastewater level falls below ON level
- On level switch opens
- pump turns off
The control can detect malfunctions or errors and display this
warning via the control unit. The control can detect illogical
switching sequences such as:
- the ALARM level is reached without the pump ON level
being reached – this results in a level error warning. The
pump operates until the wastewater level falls below the
ALARM on level. If in this case the pump ON switch closes
then the pump will remain in operation until the wastewa-
ter has fallen below the pump ON level.
- the pump ON switch is always in the closed (ON) position.
The pump remains in operation until the wastewater level
again falls below the pump ON level. If the pump remains
in operation for an over-extended period of time then con-
trol unit will signal that the max pump run time has been
exceeded or that the thermal switch in the motor has ac-
tivated.
- The pump ON switch is in the ON position and that ALARM
switch is continuously on. The control unit will immediate-
ly signal an alarm level warning. The pump will remain in
operation until the wastewater level falls below the pump
ON level or until the motor's thermal switch automatically
turns off the pump. A max pump run time warning will not
be displayed because the ALARM level warning has a hig-
her priority.
The following switching errors can not be detected by the
control unit:
- The alarm level switch does not close: the control unit thinks
that the wastewater level never reaches the ALARM level
- The pump ON switch never opens: the control unit thinks
that the wastewater level never falls below the pump OFF
level.
Illogical switching positions / sequences of the level switch
can be caused by:
- technical defect
- short circuit or break in the control unit cables
- improper connection of cables inside control unit.
Service of these errors should only be handled by a certi-
fied electrician.

8.6 What to do when...

... when a malfunction which is not discussed in this user s
manual occurs.
Contact a certified pump service firm, preferably the com-
pany which originally installed the lifting station.
... the control unit does not react to any of the buttons on
the front of the control unit.
Unplug disconnect power) to the control unit for at least
10 seconds and then re-connect to power source. If the
system does not properly re-initialize itself then please
contact a certified pump service firm, preferably the com-
pany which originally installed the lifting station.
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