Wilo EMUport FTS MG Series Installation And Operating Instructions Manual page 34

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5.5.4. Switching points
When the maximum water level (fill level) in the
collector tank is reached, the fill level sensors
switch on the particular pump. After the mini-
mum water level (fill level) in the collector tank
is reached, the fill level sensors switch off the
particular pump.
The minimum water level is always above the
pump intake port to prevent the pumps from
drawing in air. This means that the pump intake
port remains submerged. This is to prevent
siphoning by the pump because an air pocket
can cause impeller imbalance.
After the minimum water level for one pump is
reached, water flows into the collector tank again.
This continues in cycles, with the pumps operat-
ing alternately.
5.5.5. Shut-off valves for solids separation tanks
The shut-off valves (one for each solids separa-
tion tank) are delivered in the "OPEN" position.
This guarantees a flow into the solids separation
tanks.
The shut-off device is fixed (tightened) by
turning the clamping screw clockwise.
5.6. Electrical connection
ELECTROCUTION hazard!
Incorrect electrical connections can cause fa-
tal electric shocks. Electrical connections may
only be carried out by a qualified electrician
who is approved by the local power supplier,
in accordance with locally applicable regula-
tions.
• The electrical components must be connected
according to the particular connection diagrams.
• The mains current and voltage must be as stated
on the name plate of the particular components.
• Connect the power supply cable in accordance
with the applicable standards and regulations and
according to the wire assignment.
• The emergency overflow and its alarm sensors
must be connected and checked that they func-
tion correctly.
• Ground the system properly and connect to the
equipotential bonding.
The system and the electrical components must
be grounded in compliance with nationally
applicable standards. If a separate grounding
conductor is available, it must be connected to
the marked hole or grounding terminal (;) using
a suitable screw, nut, toothed washer and flat
washer. The cross section of the cable for the
grounding conductor connection must corre-
spond to the local regulations.
• A motor protection switch must be used. We
recommend using a residual current device (RCD).
• The switching system can be ordered as an
accessory.
34
5.6.1. Mains fuses
The pre-fuses must be rated according to the
starting currents of the electrical components.
You will find the starting currents on the name
plate of the components.
For the definition of the pre-fuse, please see the
particular operating and maintenance manuals.
5.6.2. Monitoring device connections
The waste water pump station is joined between
the intake pipe and collector tank directly to
an "emergency overflow". The waste water is
pumped through it "unfiltered", directly into the
collector tank.
An emergency overflow does not usually cause
any long-term loss of performance for the
system. It must however be registered by the fill
level sensors and indicated by the alarm message
"excess backup".
If the emergency overflow occurs more frequent-
ly, you must find the cause (e.g. a change in inflow
conditions) and take suitable countermeasures
(adapting the system parameters). Please consult
the manufacturer.
The alarm message "excess backup" must not
be moved up!
5.6.3. Pump monitoring devices
Each monitoring device must always be connect-
ed. You can find more information in the oper-
ating and maintenance manual from the pump
manufacturer.
5.7. Motor protection and activation types
5.7.1. Motor protection
The minimum requirement is a thermal relay/mo-
tor protection switch with temperature compen-
sation, differential triggering and an anti-reacti-
vation device in accordance with VDE 0660 or the
appropriate national regulations.
If the waste water pump station is connected
to electrical systems in which faults frequent-
ly occur, we recommend installing additional
protective devices at the customer (overvoltage,
undervoltage or phase failure relays, lightning
protection etc.). We also recommend installing
a residual current circuit breaker (RCD).
Local and national regulations must be adhered to
when connecting the system.
5.7.2. Activation types
For information about the possible types of pump
activation, please see the operating and mainte-
nance manual from the pump manufacturer.
5.7.3. Operation with frequency transformers
For information about operating the pumps with
frequency transformers, please see the operating
and maintenance manual from the pump manu-
facturer.
INSTALLATION
WILO SE 02/2020 V4.1 DIN A4