Start-Up; Maintenance - Grundfos LC 108 Montage- Und Betriebsanleitung

11. 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 LC 108 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 4. to 10.
Start-up must be carried out by authorized personnel.
Proceed as follows:
1. Check whether the float switches, electrodes or the flow
switch have been connected according to the wiring diagram
for the actual application.
2. Check that the pump inlet is submerged in the liquid to be
pumped.
3. Set the motor protection relay to the rated current stated on
the nameplate.
4. Warning:
Warning
Set the motor-protective circuit breaker to the
rated current stamped on the nameplate
according to the values in the table.
Conversion table for motor protection relay setting
I
N
10
13
17
22
28
36
46
60
77
100
5. Switch on the electricity supply.
Three-phase pumps only: Check for wrong phase sequence
(only certain variants) (the pump cannot be started if the
phase sequence is wrong!).
6. Start the pump, see section 4.5, 5.5, 6.5, 7.5, 8.5, 9.5 or 10.5.
7. Check that the pump is not running dry. The risk of dry running
can be eliminated by a renewed time setting by means of the
DIP switch according to section 4.2, 5.2, 6.2, 7.2, 8.2 or 9.2
and/or by moving the float switches or the electrodes.
8. Three-phase pumps only: Check whether the direction of
rotation of the pump is correct according to the installation
and operating instructions for the pump in question.
9. Select the required operating mode by means of the ON-OFF-
AUTO selector switch, see section 4.5, 5.5, 6.5, 7.5, 8.5, 9.5
or 10.5.
I I
DOL star-delta
10 5.8
13 7.5
17 9.6
22 12.4
28 16.1
36 20.7
46 26.8
60 34.6
77 44.7
100 57.7

12. 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 LC 108 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 controller LC 108 is
maintenance-free.
However, it is advisable to carry out minor checks of the LC 108
controller, pump pits, tanks, pumps, etc. at suitable intervals.
These checks should be carried out by authorized personnel.
• Check the gaskets of the LC 108 cabinet front and those of the
Pg cable entries.
• Check the cable entries for the explosion hazard area.
• 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 float switches,
electrodes or the flow switch.
• Check for possible blockage on the suction side of the pump.
A blockage will typically be a large solid object.
• If the LC 108 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 above list is not complete. The LC 108 may
be installed in systems, installations and/or
Note
environments which require thorough and
regular maintenance.
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