Connecting The Level Sensor; Setting; External Alarm; Startup - Grundfos LC 221 Manual De Instrucciones

5.4 Connecting the level sensor

Connect the pressure hose between the pressure tube located in
the tank and the bulkhead fitting of the control cabinet. At the
cabinet, the pressure hose must be inserted up to the stop. Insert
approximately 15 mm. Otherwise there is a risk of leakage
resulting in pressure loss, inaccurate level detection and
malfunction of the system.

5.5 Setting

You only need to set the start level so that it is equal to the inlet
level of the collecting tank. All other values are preset but can be
adjusted, if required.
The following values can be changed, if necessary:
Start level
The start level must be equal to the inlet pipe height above floor
level (180, 250 and 315 mm or 416 mm for MLD). Stop and alarm
levels are preset.
Rated current
Preset value corresponding to the rated current of the pump.
The protection against blockage is a preset value for overcurrent.
Stop delay
The stop delay increases the effective volume and reduces the
quantity of residual water in the tank. It also prevents water
hammer. The non-return valve closes more softly. The preset
value is 0.
Start delay
Normally, there is no need to make adjustments for lifting stations
except on a houseboat or pontoon boat. The preset value is 0.
Alarm delay
High temporary inflow can cause short-time high-level alarm.
This situation may arise when a backwash filter of a swimming
pool is connected. Preset value is 0.
Calibration and offset
The level sensor is calibrated at the factory. Calibrating the
sensor is only required when it is replaced. For more information,
see service instructions.
Maintenance interval
The maintenance/service interval can be set to 0, 3, 6 or
12 months and is indicated in the "SERVICE" display (no acoustic
signal).
Reset alarm
It is possible to set the controller to reset alarms automatically
when the fault disappears; however, most alarms must be reset
manually. See section 7.4 Description of fault indications.
Preset value is AUTO.
Reset to factory settings
The controller will reboot, and startup settings will have to be
made again. See section 7.2 Setup menu.

5.5.1 External alarm

Lifting stations are often installed in sumps below the basement
of buildings. That is the deepest point in the building, and an
additional alarm level switch can be placed outside the lifting
station to detect flooding caused by leakages, pipe bursts or
groundwater inflow.
The external alarm can be connected to a level switch
(230 V / 2 A) at terminals 11, 12.
12

6. Startup

Prior to startup, the connection and settings must have been
carried out according to sections 5.3 Electrical connection and
5.5 Setting.
Please double-check that the pressure hose is properly and
airtightly connected to the pressure tube in the tank and the
bulkhead fitting of the control cabinet.
Startup must be carried out by authorised personnel.
Proceed as follows:
1. Check all connections.
2. Connect mains power supply to the controller and switch it on.
There is a re-starting delay of up to 45 seconds.
This delay is to even out the mains load when
several appliances are started up at the same
Note
time when recovering from a power failure.
This time can be reduced to 5 seconds by
pressing the [OK] button.
3. When the power supply is connected for the first time, three
values for the start level can be chosen. When L_01 is
displayed press [OK].
4. Select the height of the inlet pipe, 180, 250 and 315 mm or
416 mm (for MLD) above floor level, using the buttons [>] and
[<], then press [OK] to save the desired value. If the height of
the inlet pipe is between two values, e.g. 220 mm above the
floor, choose the nearest lower value (180 mm).
Now the controller is ready for automatic mode.
5. Open the isolating valves in discharge and inlet lines.
6. Activate a sanitary appliance connected to the inflow of the
lifting station and monitor the increasing liquid level in the tank
up to the start level.
Please note that the level shown in the display of
the LC 221 is not 0 mm even though the tank may
be completely empty. As long as the pressure
tube is not immersed in water, the configured
value for the distance (e.g. 84 mm) between the
Note
bottom of the tank and the bottom edge of the
pipe is displayed. The value will change as soon
as the pressure tube starts to be immersed in
water.
Check the start and stop function several times.
Caution