Systems For Filling Applications; Electrical Connection; Setting - Grundfos LC 108 Montage- Und Betriebsanleitung

9. Systems for filling applications

Description (see also page 197 or 198):
The pump is controlled by the liquid level in the filling tank.
• The electrode, pos. 1, is the reference electrode.
• The electrode, pos. 2, starts the pump.
• The electrode, pos. 3, stops the pump. It is possible to set a
"stop delay", which delays the stop of the pump.
• The float switch, pos. 4, activates the high-level alarm.
• The manual on/off switch, pos. 5, will stop the pump when the
switch is set to position off.
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.

9.1 Electrical connection

Filling application, pages 197 and 198.
Warning
Before starting work on the system, switch off
the supply voltage and lock the mains switch in
position 0.
Any external voltage connected to the system
must be switched off before work is started.
Fig. F1 on page 197.
The figures show all electrical connections required to connect
the LC 108 for direct-on-line starting, filling application.
Fig. F2 on page 198.
The figure shows all electrical connections required to connect
the LC 108 for star-delta starting, filling application.
Warning
The LC 108 must be connected in accordance
with the rules and standards in force for the
application in question.
The operating voltage and frequency are marked on the controller
nameplate. Make sure that the controller is suitable for the
electricity supply on which it will be used.
All cables/wires must be fitted through the Pg cable entries and
gaskets (IP65).
Maximum back-up fuse is stated on the controller nameplate.
If required according to local regulations, an external mains
switch must be installed.
If the PTC resistance/thermal switch of the motor
Caution
is connected, the factory-fitted short-circuit
jumper must be removed (terminals T11-T21).
Single-phase motors must be connected to an external operating
capacitor and in certain cases also to a starting capacitor.
Further details can be found in the installation and operating
instructions for the pump in question.
Warning
Float switches or electrodes placed in an
explosion hazard area must be connected via an
EEx barrier, e.g. Grundfos number 96440300.
The EEx barrier must not be installed in the
explosion hazard area.
Equipment used in explosion hazard areas must
in each individual case have been approved for
this particular application. Furthermore, the
cables into the explosion hazard area must be
laid in accordance with local regulations.
The motor/pump housing must not be used as
Note
reference electrode.
The pressure switch, pos. 5, must be connected as an NC
contact.
Key to the symbols in fig. F1 on page 197 and fig. F2 on
page 198:
Pos. Description
1 Reference electrode. *
2 Electrode for start of pump. *
3 Electrode for stop of pump. *
4 Float switch for high-level alarm.
Manual on/off switch (or another external
5
input).
* Alternatively, float switches can be connected between
terminals: 11-12 and 21-22.

9.2 Setting

Filling application, pages 197 and 198.
The CU 211 module has a 10-pole DIP switch in the bottom right
corner, see fig. 22.
The controller must be off circuit to ensure the
Caution
correct configuration during start-up after
change of the DIP switch setting.
The DIP switch setting offers the following possibilities:
• selection of starting delay and automatic test run (switch 4),
• setting of stop delay (switches 5, 6 and 7),
• selection of automatic alarm resetting (switch 9),
• selection of automatic restarting (switch 10).
Fig. 22
Set the DIP switch as shown in fig. 22.
Each individual switch (1 to 10) of the DIP switch can be set to
position OFF or ON.
The DIP switch must not be set to other switch
Note combinations than those described in this
section.
Set the switches 1 to 10 as follows:
• Switches 1, 2 and 3, application type:
When the DIP switch setting is changed, the controller must
be switched off for at least 1 minute!
This setting determines the actual application type
(filling application, pages 197 and 198).
Terminal
number
11
12
22
31-32
41-42
29