Systems With 3 Levels (4 Electrodes); Electrical Connection; Setting - Grundfos LC 110 Montage- Und Betriebsanleitung

5. Systems with 3 levels (4 electrodes)

Description (see also page 262):
The pump is controlled by the liquid level in the pit.
• The electrode, pos. 2, starts the pump.
• The electrode, pos. 1, stops the pump. It is possible to set
a "stop delay" which delays the stop of the pump.
• The top electrode, pos. 3, activates the high-level alarm.
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 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.

5.1 Electrical connection

Systems with 3 levels (4 electrodes), page 262.
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.
Figure 2 on page 262 shows all electrical connections required to
connect the LC 110 for 3 levels (4 electrodes).
Warning
The LC 110 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 motor PTC resistor/thermal switch is
connected, the factory-fitted short-circuit jumper
must be removed (terminals T11-T21). For correct
Caution
installation of PTC resistor/thermal switch, see the
installation and operating instructions of the pump.
Key to the symbols in fig. 2 on page 262:
Pos. Description
R Reference electrode.
1 Electrode for stop of pump.
2 Electrode for start of pump.
3 Electrode for high-level alarm.
10

5.2 Setting

Systems with 3 levels (4 electrodes), page 262.
The module CU 213 has a 10-pole DIP switch in the bottom right
corner, see fig. 5.
During setting, the controller must be off circuit for at
least 1 minute to ensure the correct configuration
Caution
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. 5
Set the DIP switch as shown in fig. 5.
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
(3 levels (4 electrodes), page 262).
• Switch 4, starting delay and automatic test run
Terminal
(only in the case of battery back-up):
number
When the DIP switch setting is changed, the controller must
be switched off for at least 1 minute!
11
12
At this setting, the start-up is delayed within the range
from 0 to 255 sec. (random) after the electricity supply
22
has been switched on when the liquid level is
32
sufficiently high.
Automatic test run carried out every 24 hours.
After the electricity has been switched on, the pump will
start immediately when the liquid level is sufficiently
high.
No automatic test run.