Grundfos Multilift MSS Instrucciones De Instalación Y Funcionamiento página 9

5.2 LC 220 controller
The level controller switches the MSS Multilift pump on and off
according to the liquid level measured by the piezoresistive,
analogue 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 will be
indicated in case of high water level in the tank, sensor failure
etc.
Fig. 6 LC 220 level controller for Multilift MSS
The LC 220 controller has the following functions:
• on/off control of one wastewater pump based on a continuous
signal from a piezoresistive, analogue level sensor
• automatic test runs during long periods of inactivity (24 hours
after last operation)
• battery backup in case of mains supply failure (accessory)
• selection of automatic alarm resetting (via DIP switch)
• selection between two inlet levels (via DIP switch)
• operating indication of:
- power on
- pump running
- time for service/maintenance (selectable via DIP switch).
• alarm indication of:
- too high liquid level, which triggers a high-level alarm
- wrong phase or phase sequence detection for three-phase
pumps
- sensor failure
- external level alarm
- runtime monitoring.
As standard, the LC 220 controller has one alarm signal output
for common alarm and three signal inputs for connecting the
piezoresistive sensor, an additional float switch functioning as
backup for the analogue sensors and an additional level switch
for flood detection outside the Multilift MSS. 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 will be on and the built-in buzzer will be
activated.
A battery (accessory) can be installed to activate an acoustic
alarm (buzzer). The buzzer will be activated as long as the fault
exists as it cannot be reset.
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.
A PC Tool can be connected in order to implement updates and
further adjustments.
Furthermore, a log of the last 20 faults can be read out, as well as
the number of starts and operating hours (accessory).
Type key, LC 220 controller
Example
LC 220 = controller type
1 = one-pump controller
2 = two-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
I
3W 4A
P
Pump max
max
6
16A
I I < 10 kA IP55
Fuse max c
1,8kg
G
7
Made in Germany
Fig. 7 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
5.2.1 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
9