Grundfos Multilift MD, Installation And Operating Instructions Manual

Page: 11 / 704

English (GB)
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5.2.1 Design
The LC 221 level controller incorporates the necessary
components to control and protect the pumps, such as relays and
capacitors for single-phase motors, contactors for three-phase
motors and additional motor-protective circuit breaker
(> Multilift MD22 or MLD22).
The control panel offers a user interface with operating buttons
and a display for indication of operating conditions and fault
indications.
Furthermore, it has an integrated piezoresistive pressure sensor
which is activated by compressed air directly via the pressure
tube inside the collecting tank. Finally, it has terminals for power
supply, connection to the pump and the inputs and outputs
mentioned in section
5.2 LC 221 controller .
The front cover is closed by four bayonet fastenings with quarter
turn locks. On the left side, the locks are extended and connected
to the cabinet bottom with hinge strings. The cabinet offers the
possibility of being mounted on a wall without opening it first.
A drilling template and six screws with rubber guides are
enclosed.
5.2.2 Control panel
Fig. 9 Control panel
Display (pos. 1)
The display shows all relevant operating data and fault indications.
The operation and fault indications are described in section
6.1 Description of display .
Operating buttons (pos. 2)
The level controller is operated by the operating buttons placed
under the display. The functions of the operating buttons are
described in the table below:
Status LEDs (pos. 3)
The upper LED (green) is on when the power supply is on.
The lower LED flashes (red) in case of fault to make the fault
visible from a long distance and is thus an addition to the display
symbols and fault codes.
Selector switch (pos. 4)
T
M
05
18
60
38
11
Pos. Description
1 Display
2 Operating buttons
3 Status LEDs
4 ON-OFF-AUTO selector switch
1
2
3 4
Operating
button
Description
• go left in the main menu.
• go up in the submenus.
• decrease values in the submenus.
• confirm a selection.
• activate the submenus.
• reset the buzzer.
• go right in the main menu.
• go down in the submenus.
• increase values in the submenus.
Switch Description of function
The operating mode is selected by the
ON-OFF-AUTO selector switch which has three
different positions:
POS I:
Starts the pump manually. The operating time
protection is active and indicates alarm after three
minutes. Normal operating times are up to max.
25 seconds (MD) and 55 seconds (MLD).
POS O:
• Stops the pump when running and cuts off the
power supply to the pump. The three symbols
"Settings locked", "Information" and "Setup" will
be visible.
• Resets fault indications.
POS AUTO:
Automatic operation. The pump will start and stop
according to the signal from the level sensor.