Systems For Drainage Applications; Electrical Connection; Setting - Grundfos LC 108 Installation And Operating Instructions Manual

10. Systems for drainage applications

Description (see also page 199 or 200):
The pump is controlled by the flow switch, pos. 2, in the discharge
pipe.
• The pump is stopped when the flow switch does not register
any liquid flow.
• After a stop signal, the pump will attempt to restart when the
"restarting time" (can be set) has expired. The restarting
attempt will be interrupted if the flow switch does not register
any liquid flow before the expiration of the "dead time" (can be
set).
• The switch for manual restarting, pos. 1, will initiate a
restarting attempt when the switch is set to position on
(restarting).
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.

10.1 Electrical connection

Drainage application, pages 199 and 200.
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. G1 on page 199.
The figures show all electrical connections required to connect
the LC 108 for direct-on-line starting, drainage application, flow
switch.
Fig. G2 on page 200.
The figure shows all electrical connections required to connect
the LC 108 for start-delta starting, drainage application, flow
switch.
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
LC 108 must not be used for drainage
applications (pages 200 and 200) in explosion
hazard areas as the motor will restart
automatically after the PTC resistance/thermal
switch in the motor has caused a cutout.
However, the motor will not restart until it has
cooled to normal temperature.
The switch for manual restarting, pos. 1, must be connected as
an NC contact.
The flow switch, pos. 2, must be connected as an NO contact.
Key to the symbols in fig. G1 on page 199 and fig. G2 on
page 200:
Pos. Description
1 Switch for manual restarting.
2 Flow switch.

10.2 Setting

Drainage application, pages 199 and 200.
The CU 211 module has a 10-pole DIP switch in the bottom right
corner, see fig. 26.
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:
• setting of dead time (switches 4, 5 and 6),
• setting of restarting time (switches 7, 8, 9 and 10).
Fig. 26
Set the DIP switch as shown in fig. 26.
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
(drainage application, pages 200 and 200).
Terminal
number
41-42
11-12
33