4
2.1 Location
The LCD 108 can be mounted at ambient temperatures ranging
from –30 °C to +50 °C.
Enclosure class: IP 65.
When installed outdoors, the LCD 108 must be placed in a
protective shed or cupboard.
The LCD 108 must not be exposed to direct sunlight.
2.2 Mounting of LCD 108 for direct-on-line starting
Before mounting, remove the transport protectors, if any, from
inside the cabinet.
Mount the LCD 108:
• on a plane wall surface,
• with the Pg cable entries pointing downwards
(additional Pg cable entries, if required, must be fitted in the
bottom plate of the cabinet),
• with four screws through the mounting holes in the back plate
of the cabinet. The mounting holes must be bored with a 4 mm
bore. Fit the screws into the mounting holes and tighten
securely. Fit the plastic caps supplied with the controller on the
screws (IP 65).
Figure 1 shows the terminals listed under positions 2 and 3.
Fig. 1
Key to the symbols in figs. 1 and 1:
Note:
If the distance between the controller and pit exceeds
20 metres, it is not advisable to use electrodes as problems with
the signal values sent back to the controller may arise.
In such cases, it is recommended to use float switches.
Note:
Cables of up to 100 metres can be connected between the
controller and the float switches.
3. Systems for parallel operation with 3 float
switches
Description (see also page 23 or 24):
The pumps are controlled by the liquid level in the pit.
• When the float switch, pos. 1, registers liquid, the first pump is
started.
• When the float switch, pos. 2, registers liquid, the next pump is
started.
• When the float switch, 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 float switch, pos. 3, activates the high-level alarm.
3.1 Electrical connection
Parallel operation with 3 float switches, pages 23 or 24.
Fig. A1 on page 23.
The figures show all electrical connections required to connect
the LCD 108 for
direct-on-line starting, parallel operation with
3 float switches
.
Fig. A2 on page 24.
The figure shows all electrical connections required to connect
the LCD 108 for
star-delta starting, parallel operation with 3 float
switches
.
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 (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 PTC resistance/thermal switch of the motor is
connected, the factory-fitted short-circuit jumper must be
removed
(terminals T11-T21, T12-T22). For correct installation of
PTC resistor/thermal switch, see the installation and operating
instructions of the pump.
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.
The LCD 108 controller and an EEx barrier, if
required,
must not
be installed in explosion hazard
areas.
Only
float switches approved for use in explosion
hazard areas may be used. The float switches
must
be connected via an EEx barrier, e.g. Grundfos
number 96440300.
TM0
1
483
3
2
3
0
8
Pos.
Description
1
Terminal block for level inputs
(11-12, 21-22, 31-32, 41-42).
2
Terminal block with:
• input for the PTC resistance/thermal switch of the
motor (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).
22
12
T21
T1
1
T22
T12
H-NO
H-COM
H-NC
G-NO
G-COM
G-NC
21
11
32
42
31
41
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 LCD 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.
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 108 must be connected in accordance with
the rules and standards in force for the application in
question.
Float switches 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.
