18
Figure 10 shows the terminals listed under positions 2 and 3.
Fig. 10
Key to the symbols in figs. 9 and 10:
13. Systems for parallel operation with
3 levels (4 electrodes)
Description (see also page 100):
The pumps are controlled by the liquid level in the pit.
•
When the electrode, pos. 1, registers liquid, the first pump is
started.
•
When the electrode, pos. 2, registers liquid, the next pump is
started.
•
When the electrode, pos. 1,
does not
register any liquid, the
“stop delay” is initiated (can be set). After expiration of the
stop delay, both pumps are stopped.
•
The pumps operate alternately.
•
The top electrode, pos. 3, activates the high-level alarm.
13.1 Electrical connection
Systems for parallel operation with 3 levels (4 electrodes),
page 100.
Figure D1 on page
shows all electrical connections required
to connect the LCD 110 for
parallel operation with 3 levels (4
electrodes)
.
The operating voltage and frequency are marked on the controller
nameplate. Make sure that the controller is suitable for the elec-
tricity supply on which it will be used.
All cables/wires must be fitted through the Pg cable entries and
gaskets (IP 65).
Maximum back-up fuse is stated on the controller nameplate.
If required according to local regulations, an external mains
switch must be installed.
Note:
If the motor PTC resistor/thermal switch is connected, the
factory-fitted short-circuit jumper
must be removed
(terminals
T11-T21). For correct installation of PTC resistor/thermal switch,
see the installation and operating instructions of the pump.
Key to the symbols in fig. D1 on page 100:
TM
02 234
9 410
1
Pos.
Description
1
Module CU 214.
2
Terminal block for level inputs
(11-12, 22, 32 and 42).
3
Terminal block with:
• input for the motor PTC resistor/thermal switch
(T11-T21, T12-T22),
• input for the motor thermal switch
(T11-T21, T12-T22),
• output for external alarm device for high-level alarm
(H-NC, H-COM, H-NO) (only certain variants),
• output for external alarm device for common alarm
(G-NC, G-COM, G-NO).
4
Motor protection relays, pumps 1 and 2 (contacts and
thermal relay fitted).
5
Terminal block for electricity supply.
6
Fuse holders for control circuit fuses
(1 to 3 depending on voltage/current variant).
7
Isolating transformer.
9
Pg cable entries.
10
Earth bar (
PE
).
22
12
42
32
T22
T12
T21
T1
1
11
H-NO
H-COM
H-NC
G-NO
G-COM
G-NC
Before starting any work on pumps used to pump liq-
uids which could be constituted as being hazardous
to health, thorough cleaning/venting of pumps, pits,
etc. must be carried out according to local regula-
tions.
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.
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.
The LCD 110 must be connected in accordance with
the rules and standards in force for the application in
question.
Pos.
Description
Terminal
number
R
Reference electrode.
11
1
Electrode for start of the first pump/
common stop.
12
2
Electrode for start of the next pump.
22
3
Electrode for high-level alarm.
32
