Operating Principle; Operating Modes; Technical Data; Type Key - Wilo RexaLift FIT L Einbau- Und Betriebsanleitung

English
nection DN 80 is configured vertically above the
reservoir. A non-return valve with ventilation
devices integrated in the pressure connection.
In addition, the lifting unit has two further DN 50/
DN 70 combined connections on the tank roof for
intake and venting and two DN 50 connections on
the front end and two on the rear end for emer-
gency draining.
For simple maintenance of the unit, the collection
reservoir is equipped with an inspection opening.
Furthermore, the reservoir also has two fastening
straps. This allows the lifting unit to be anchored
in an anti-buoyant way to the ground with the
supplied fixation material. The fastening straps
also function as transport carrying handles.
3.2.2. Pump unit
The fitted pump unit consists of the motor with
the fitter impeller and an adapter ring.
The motor is a watertight, encapsulated glanded
motor with a stainless steel housing and three-
phase design. The cooling is done by the ambient
air. The waste heat is given off via the motor
housing. The motor is equipped with a thermal
winding monitor with bimetallic strips. The wind-
ing monitoring is displayed and reset via the
connected switchgear.
The adapter ring connects the complete unit with
the collection reservoir.
3.2.3. Level control
The level control is fitted in the collection
reservoir. Rod float switches are used as signal
transmitters. The switching points are set and
specified.
3.2.4. Switchgear
The system is controlled via the fitted switchgear.
The switchgear can also be used to implement a
collective fault signal (SSM). The cable from the
motor to the switchgear is 4 m long and the cable
from the switchgear to the plug is 1.5 m long.
See the enclosed installation and operating
instructions for the precise switchgear specifica-
tions.
3.2.5. Versions
The lifting unit is available in the following ver-
sions:
• Single-pump system with switchgear and
CEE-plug, including phase inverter.
• Double-pump system with switchgear and
CEE-plug, including phase inverter.

3.3. Operating principle

The sewage that arrives is channelled into the
collection reservoir via the inlet pipes, where it
collects.
If the water level rises as far as the switch-on lev-
el then the pump is switched on by the integrated
level control and the collected sewage is pumped
into the connected pressure pipe.
34
The pump is switched off when the switch-off
level is reached and the set follow-up time has
elapsed.
When the high water level is reached, an acoustic
warning is output and there is a forced switch-on
of all pumps. As soon as the water drops below
the high water level, the pumps are switched off
once the follow-up time has elapsed, and the
warning message is acknowledged automatically.
3.3.1. Special features of double-pump systems
• An automatic pump alteration occurs after every
pump operation.
• If one pump malfunctions, the other pump is
automatically used as the base-load pump.
• In the event of large volumes of sewage, both
pumps can be switched on in parallel.

3.4. Operating modes

3.4.1. Operating mode S3 (intermittent operation)
This operating mode involves the maximum ratio
between operating time and downtime:
S3 10%/120 s
operating time 12 s / downtime 108 s
3.4.2. Variant operating mode
Depending on the volume flow, the operat-
ing mode can vary between S3 10%/120 s and
S3 20%/120 s. For more precise information, see
the table in the appendix of these instructions.

3.5. Technical data

For the technical data for the individual lifting
units, see the table in the appendix of these
instructions.

3.6. Type key

Wilo-RexaLift FIT L2-10/EAD1-2-T0026-
Example:
540-P/MS
RexaLift
Sewage lifting unit
FIT
Standard version
L
Size
1 = single-pump system
2
2 = Double-pump system
10 Maximum delivery head in m at Q = 0
Motor version
E
E = dry motor
R = reduced-power glanded motor
"Motor" material version
A
A = standard type
Seal version
D
D = 2 independent mechanical shaft seals
IE efficiency class, e.g.: 1 = IE1 (based on
1
IEC 60034‑30)
-
not Ex-rated
2
Number of poles
Mains connection version
T
M = 1~
T = 3~
PRODUCT DESCRIPTION
WILO SE 01/2014 Ed.05 DIN A4