Start-Up; Maintenance - Grundfos LC 110 Montage- Und Betriebsanleitung

18. Start-up

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.
Prior to start-up, the connection and DIP switch setting must have
been carried out according to sections
Start-up must be carried out by authorized personnel.
Proceed as follows:
1. Check whether the electrodes have been connected
according to the wiring diagram for the actual application.
2. Check that the pump inlets are submerged in the liquid to be
pumped.
3. Set the motor protection relays to the rated current stated on
the nameplates.
4. Warning:
Warning
Set the motor-protective circuit breakers to the rated
current stamped on the nameplates.
5. Switch on the electricity supply.
Three-phase pumps only: Check for wrong phase sequence
(the pump cannot be started if the phase sequence is wrong!).
6. Start the pumps, see section 14.5, 15.5,
7. Check that the pumps are not running dry. The risk of dry
running can be eliminated by a renewed time setting by
means of the DIP switch (stop delay) according to section
14.2, 15.2, 16.2 or 17.2 and/or by moving/shortening the
electrodes.
8. Three-phase pumps only: Check whether the direction of
rotation of the pumps is correct according to the installation
and operating instructions for the pumps in question.
9. Select the required operating mode by means of the
ON-OFF-AUTO selector switch, see section 14.5, 15.5,
or 17.5.
14. to 17.
16.5 or 17.5.
16.5

19. Maintenance

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.
During normal application and operation, the LCD 110 controller
is maintenance-free.
However, it is advisable to carry out minor checks of the LCD 110
controller, pump pits, tanks, pumps, etc. at suitable intervals.
These checks should be carried out by authorized personnel.
• Check the gaskets of the LCD 110 cabinet front and those of
the Pg cable entries.
• Check for possible deposits/sludge build-up in the pump
pit/tank. Sludge may settle in areas with almost stagnant
liquid.
• Check for beginning sludge build-up around the electrodes.
• Check for possible blockage on the suction side of the pump.
A blockage will typically be a large solid object.
• If the LCD 110 has been installed in a particularly aggressive
environment, it is advisable to check the motor protection
contacts in order to identify possible chemical attack resulting
in corrosion. In typical installations, the motor protection
contacts will work for several years and do not require any
inspection.
The list above is not complete. The LCD 110 may be
installed in systems, installations and/or
Note
environments which require thorough and regular
maintenance.
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