Fault Finding Chart; Warning - Grundfos LC 110 Montage- Und Betriebsanleitung

21. Fault finding chart

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 LCD 110 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
1. The pumps do not run. a) No electricity supply.
b) The ON-OFF-AUTO selector switch is in
c) Control circuit fuses are blown.
d) The motor protection relays have cut out the
e) The motor thermal switch has cut out the
f)
g) Motor/supply cable is defective.
h) The electrodes are dirty or defective.
i)
j)
2. The pumps are a) The electrodes are dirty or defective.
starting/stopping too
frequently.
See also installation and operating instructions for the pump in question.
22. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
Without battery back-up:
None of the indicator lights are on.
With battery back-up
(accessory for certain variants):
See section 14.4, 15.4, 16.4 or 17.4.
position OFF ( ), see section 14.5, 15.5,
16.5 or 17.5.
pumps (the red indicator light for pump fault
is permanently on).
pump (the red indicator light for pump fault is
flashing).
The control circuit for the motor protection
relays has been broken or fails (the green
indicator light indicating pump operation is
permanently on, see section 14.3, 15.3,
or 17.3).
The CU 214 module is defective.
The new DIP switch setting does not work
correctly.
Subject to alterations.
Remedy
Switch on the electricity supply.
Push the ON-OFF-AUTO selector switch into position
ON ( ) or AUTO ( ).
Check and eliminate the cause. Replace the control
circuit fuses (see pos. 6 in fig. 9).
Check the pump/pit.
Allow the pump to cool. After cooling, the pump will
restart automatically unless the LCD 110 has been set
to manual restarting, see section 14.2, 15.2,
17.2. 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
electrodes, these must be cleaned or replaced.
Check the control circuit.
16.3
Check motor and cable.
Check cables and electrodes.
Replace the CU 214 module.
Switch off the electricity supply to the controller for
1 minute and switch it on again (normal procedure).
See section 14.2, 15.2, 16.2
Check cables and electrodes.
16.2 or
or 17.2.
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