Product Description; Design - Grundfos LC 220 Montage- Und Betriebsanleitung

4. Product description

Grundfos LC 220 controllers are designed for control of
wastewater lifting stations, such as Multilift MSS or Unolift.
The level controller switches the pump on and off according to the
liquid level measured by the piezoresistive level sensor.
When the start level is reached, the pump will start, and when the
liquid level has been lowered to the stop level, the pump will be
stopped by the controller. An alarm is indicated in case of high
water level in the tank, sensor failure etc.
Fig. 1 LC 220 level controller
The LC 220 controller features the following functions:
• on/off control of the pump based on a continuous signal from
the piezoresistive level sensor
• automatic test runs for two seconds (24 hours after last
operation) to maintain the pump and its shaft seal
• battery backup for the buzzer in case of mains supply failure
(Battery and battery connector available as accessory)
• selection of automatic alarm resetting (via DIP switch)
• selection between two inlet levels (via DIP switch)
• operating indication:
– power on
– pump running
– service/maintenance indication.
• alarm indication:
– liquid level too high (high-level alarm)
– wrong phase sequence detected or phase missing
(for three-phase pumps only)
– sensor failure
– external level alarm
– runtime monitoring.
The LC 220 controller has one alarm signal output for common
alarm and two signal inputs. One input is for connecting an
additional float switch working in parallel to the piezoresistive
level sensor. The other input is a signal input to trigger optical and
acoustical alarms of the controller which could be for instance
flood detection outside the lifting station as lifting stations are
often installed in a sump inside the basement - the lowest point in
the building. In case of e.g. groundwater inflow or water pipe
burst, an alarm will be indicated by the controller. If the liquid
level in the sump rises above the high-level alarm level, the
corresponding alarm LED is on and the built-in buzzer sounds if
an external float switch indicates such a situation to the controller.
A battery (accessory) can be installed to give an acoustic alarm in
case of a power failure.
In case of power failure, the common alarm output, which is a
potential-free changeover contact, can forward the alarm signal
to a control room by means of an external power source.
6
Type key, LC 220 controller
Example
LC 220 = controller type
1 = one-pump controller
Voltage [V]
1 = single-phase
3 = three-phase
Maximum operating current per pump [A]
Nameplate, LC 220 controller
The actual controller type, voltage variant, etc., are stated in the
type designation on the nameplate situated on the side of the
controller cabinet.
1 2
LC 220.1.400.3.4
Type
4
98167897 V01
Prod. No.
3x 380-415V~ 50/60Hz
5 U
N
3W I 4A
P
Pump max
max
6
16A
I I
< 10 kA IP55
Fuse max c
1,8kg
G
7
Made in Germany
Fig. 2 Example of an LC 220 nameplate
Pos. Description
1 Type designation
2 Product number
3 Version number
4 Rated voltage
5 Power consumption
6 Maximum backup fuse
7 Weight
8 Maximum pump input current
9 Production year and week
10 Serial number
11 Maximum voltage at contactor
12 Maximum current at contactor

4.1 Design

The LC 220 level controller incorporates the necessary
components such as relays and a control panel with indicator
lights for indication of operating conditions and fault indications.
Furthermore, it has a level input which is activated directly via the
pressure tube inside the collecting tank. Finally, it has terminals
for power supply, connection to the pump and an alarm signal
output for common alarm.
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.
LC 220 .1 .230 .1
3
9
1226
P.c.
8888
Serial No.
10
V 250V
Contact max
2A
I
11
Contact max
T
.: 0 to 40 C
Amb
12
8
.8