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12
6. Fault finding chart
See also installation and operating instructions for the pump in question.
Warning
Before starting any work on pumps used to pump
liquids which could be constituted as being
hazardous to health, thorough cleaning/venting of
pumps, pits, etc. must be carried out according to
local regulations.
Before making any connections in the LC/D 107 or
work on pumps, pits, etc., it must be ensured that the
electricity supply has been switched off and that it
cannot be accidentally switched on.
Fault Cause Remedy
1. The pump(s) does/do
not run.
a) No electricity supply.
Without battery back-up:
None of the indicator lights are on.
With battery back-up:
See section 4.1 Battery back-up functions -
LC 107 one-pump controller or 5.1 Battery
back-up functions - LCD 107 two-pump
controller.
Switch on the electricity supply.
b) The ON-OFF-AUTO selector switch is in
position OFF ( ), see section 4.2 Reset
button and ON-OFF-AUTO selector switch -
LC 107 one-pump controller or 5.2 Reset
button and ON-OFF-AUTO selector switch -
LCD 107 two-pump controller.
Push the ON-OFF-AUTO selector switch into position
ON ( ) or AUTO ( ).
c) Control circuit fuses are blown. Check and eliminate the cause. Replace the control
circuit fuses (see pos. 6 in fig. 1).
d) The motor protection relay(s) has/have cut
out the pump(s) (the red indicator light for
pump fault is on).
Check the pump/pit.
e) The PTC resistance/thermal switch has cut
out the pump (the red indicator light for
pump fault is flashing).
Allow the pump to cool. After cooling, the pump will
restart automatically unless the LC/D 107 has been set
to manual restarting, see section 2.5 Setting of LC 107
and LCD 107. If so, the ON-OFF-AUTO selector switch
must be pushed into position OFF ( ) for a short period.
If the pump cutout was caused by choked-up level
pickups, these must be cleaned or replaced.
f) The control circuit for the motor protection
relay(s) has been broken or is defective (the
green indicator light indicating pump
operation is on, see section 4. Operation
and functions - LC 107 one-pump controller
or 5. Operation and functions - LCD 107
two-pump controller).
Check the control circuit.
g) Motor/supply cable is defective. Check motor and cable.
h) The level pickup fails. Check the position of the level pickups.
Check pneumatic tubes, level pickups and pressure
switches.
i) The module CU 211 or CU 212 is defective. Replace the module CU 211 or CU 212.
j) The new DIP switch setting does not work
correctly.
Switch off the electricity supply to the controller for
1 minute and switch it on again (normal procedure).
See section 2.5 Setting of LC 107 and LCD 107.
2. The pump(s) is/are
starting/stopping too
frequently.
a) The level pickup fails. Check the position of the level pickups.
Check pneumatic tubes, level pickups and pressure
switches.
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