Choosing The Mode; Starting Unit; Starting Unit With Alternation (Lcd Only); Level Converter - Grundfos LCD 115 Serie Installationsanleitung

5. Choosing the mode

The controller can be set to three modes:

– starting unit

– starting unit with alternation

– level converter.

In an application with pumps, we recommend that you use a
starting unit or starting unit with alternation.
5.1 Starting unit
The controller converts the analog signal from the level sensor
into digital signals. This enables start/stop of the pump at two
setpoints and activation of high-level alarm.
This is the usual setting for a pit with heavy and random flow
intake.

5.2 Starting unit with alternation (LCD only)

The controller enables start/stop of the two pumps alternately.
This mode is ideal for a pit with slow water intake.
5.3 Level converter
The same setpoint is used for start and stop. We do not
recommend this mode in an application with pumps.

6. Reading the display

Fig. 5 Display of the CU 215
When the controller is connected to the power supply and
properly connected to the level sensor, the CU 215 module shows
the liquid level.
If the level sensor is not properly connected, the display will show
"---".
The four orange light diodes correspond to four configurable relay
outputs: S1, S2, S3 and S4. Each of them corresponds to a liquid
level. See table below.
LED Colour Description
The CU 215 is functioning
Green
normally.
Output S4 is activated. The level
Orange
is higher than setpoint S4.
Output S3 is activated. The level
Orange
is higher than setpoint S3.
Output S2 is activated. The level
Orange
is higher than setpoint S2.
Output S1 is activated. The level
Orange
is higher than setpoint S1.
8

7. Configuring the controller

The following parameters can be set:
• Mode:
– starting unit
– starting unit with alternation
– level converter.
• Range of the level sensor (liquid level in metres corresponding
to 20 mA).
• Setpoints S1, S2, S3 and S4.
1. Scroll through the parameters using the up and down buttons
on the display.
2. To change a parameter, press [ ● ] for eight seconds. The first
digit flashes and can be changed.
3. Press the button again to select the next digit.
4. When you have selected the last digit, press the button again.
The display will cease to flash, and the parameter has been
changed.
Reactions if none of the buttons are pressed for eight seconds:
• When scrolling through the parameters:
The display reverts to its original state, and the diodes revert
to the normal displaying of the liquid level.
• When changing a parameter:
The parameter is set to the actual value shown in the display,
and the display ceases to flash.
Setting the mode
LED Indicator Description
LvL: Level converter.
All LEDs
StA: Starting unit.
on.
S.t.A.: Starting unit with alternation of
pump 1 and 2. Only LCD.
Setting the range
LED Description
Range of the level sensor (liquid level
LED 1
in metres corresponding to 20 mA).
and 2 on.
Max. 10 m.