General - Lcd; Applications; Variants; Location And Mounting - Grundfos LC 110 Montage- Und Betriebsanleitung

12. General - LCD 110

The LCD 110 controller is designed for the control of pumps in
wastewater systems.
Type key:
Example
LCD = two-pump controller
110 = type designation
Phase voltage [V]
1 = single-phase
3 = three-phase
Maximum operating current per pump [A]

12.1 Applications

The LCD 110 enables:
• control of two pumps based on level signals from electrodes,
• automatic pump changeover (even distribution of operating
hours on both pumps),
• selection of automatic test run during long periods of inactivity
(every 24 hours),
• battery back-up in case of mains supply failure (accessory for
certain variants),
• starting delay within the range from 0 to 255 sec. (random)
after returning from battery operation to mains operation
(resulting in an even mains load when several pumping
stations are started up at the same time),
• selection of automatic alarm resetting,
• selection of automatic restarting,
• setting of stop delays matching the actual operating
conditions,
• indication of liquid level,
• alarm indication of:
– inadmissibly high liquid level,
– overload (via motor protection relay),
– overtemperature (via thermal switch in motor),
– wrong phase sequence (only three-phase versions),
– mains supply failure (only certain variants),
– dirty or defective electrode.
As standard, the LCD 110 has one alarm output for common
alarm. Certain variants have an additional alarm output for
separate high-level alarm.
Furthermore, the controller incorporates a buzzer (only certain

variants).

12.2 Variants
The actual controller type, voltage variant, etc. are stated in the
type key on the nameplate situated on the side of the controller
cabinet.
The LCD 110 is available for direct-on-line starting.
The LCD 110 can be connected and set to operation/control in
4 different ways, see sections 14.
• Section 14. Systems for parallel operation with
3 levels (4 electrodes).
• Section 15. Systems for parallel operation with
4 levels (5 electrodes).
• Section 16. Systems for 100 % standby operation with
4 levels (5 electrodes).
• Section 17. Systems for full-control operation with
4 levels (5 electrodes).
LCD 110 400 3 23
to 17.:

13. Location and mounting

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 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.
The installation must be carried out by authorized personnel in
accordance with local regulations.

13.1 Location

Warning
The LCD 110 controller must not be installed in
explosion hazard areas.
The LCD 110 can be mounted at ambient temperatures ranging
from -30 °C to +50 °C.
Enclosure class: IP65.
When installed outdoors, the LCD 110 must be placed in a
protective shed or cupboard.
The LCD 110 must not be exposed to direct sunlight.

13.2 Mounting of LCD 110

Before mounting, remove the transport protectors, if any, from
inside the cabinet.
Mount the LCD 110:
• 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 (IP65).
Figure 9 shows the internal construction of the LCD 110.
5
6
7
Fig. 9
278
254
1
3 2
4 4
4 4
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