Electrical Connection - Wilo EMU FA Serie Instrucciones De Instalación Y Funcionamiento

INSTALLATION
5.4.1. Corrective measures for avoiding excessive
switching cycles
• Manual reset
The motor is switched off when the water level
falls below the minimum coverage level and
switched back on when a sufficient water level is
reached.
• Separate reactivation point
A second switching point (additional float or
electrode) is used to obtain a sufficient difference
between the activation and deactivation points.
This prevents constant switching. This function
can be put into effect with a level control relay.

5.5. 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.
DANGER - explosive atmosphere!
With Ex-rated pumps, the power supply cable
must be connected outside the potentially
explosive area, or inside a housing with igni-
tion protection conforming to DIN EN 60079-
0! Failure to observe this can lead to fatal
injury due to explosion!
• Always have the connection carried out by an
electrician.
• Note the additional information about this in
the appendix.
• The mains connection current and voltage must
be as stated on the rating plate.
• Connect the power supply cable in accordance
with the applicable standards and regulations and
according to the conductor assignment.
• Any available monitoring equipment, e.g. for
thermal motor monitoring, must be connected
and tested to ensure that it is working properly.
• For three-phase AC motors, a clockwise rotating
field must be available.
• Ground the pump properly.
Pumps that are permanently installed must be
grounded in compliance with nationally applica-
ble 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 correspond to the
local regulations.
• A motor protection switch must be used for
motors with a free cable end. We recommend
using a residual current device (RCD).
• Switching devices must be purchased as acces-
sories.
Installation and operating instructions Wilo-EMU FA+T-Motor
5.5.1. Mains fuses
The back-up fuse must be rated according to the
starting current. You will find the starting current
on the rating plate.
Only slow-blow fuses or K characteristic auto-
matic cut-outs may be used as a back-up fuse.
5.5.2. Three-phase AC motor
The three-phase current version is supplied with
free cable ends. It is connected to the mains at
the switch box terminals.
The following list of wiring diagrams only includes
standard cable configurations. For versions
specific to orders, a separate wiring diagram is
enclosed with each order.
Please note that the individual wires are des-
ignated for particular connections. Do not cut
them off! Otherwise you will no longer know
which wire belongs to which connection!
Electrical connections may only be made by
a qualified electrician!
Fig. 7.: Wiring diagram for motor in direct activation
U
V Mains connection
W
Fig. 8.: Wiring diagram for motor in star-delta activation
U1
Mains connection;
V1
winding start
W1
PE Ground
5.5.3. Monitoring device connections
The following list of wiring diagrams only includes
standard cable configurations. For versions
specific to orders, a separate wiring diagram is
enclosed with each order.
All monitoring devices must be connected at all
times!
Leakage detection for
DK
motor compartment
PE Ground
U2
Mains connection;
V2
winding end
W2
Leakage detection for
DK
motor compartment
English
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