Electrical Connection - Wilo Rexa FIT Serie Manual Del Usuario

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5.6 Electrical connection

Risk of fatal injury due to electrical current!
There is a risk of fatal electric shocks caused by
improper electrical connections. Electrical con-
nections may only be carried out by a qualified
electrician who is approved by the local power
supplier, in accordance with locally applicable
regulations.
• Mains current and voltage must correspond to the
details on the type plate.
• Connect the power supply cable in accordance with the
applicable standards and regulations and according to
the wire assignment.
• Any available monitoring equipment, e.g. for the motor
temperature, must be connected and tested to ensure
that it is working properly.
• For three-phase current motors, a clockwise rotating
field must be available.
• Ground the product properly.
Products that are permanently installed must be
grounded in compliance with nationally applicable
standards. If a separate grounding conductor is avail-
able, 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 three-
phase motors. We recommend using an earth leakage
circuit breaker (RCD)
• Switching devices are to be purchased as accessories.
5.6.1 Network-side fuses
The pre-fusing must be rated according to the starting
currents. You will find the starting currents on the type
plate.
Only slow-blow fuses or K characteristic automatic
cut-outs may be used for pre-fusing.
5.6.2 AC motor
Fig. 4: Connection plan
L
Mains supply
N
The AC version can be equipped with the following:
• safety plug
• float switch and safety plug
To connect it to the electricity supply, plug it into the
power socket.
To connect the unit directly in the switch box, the plug
must be removed and the electrical connection made
by a qualified electrician!
The wires of the connection cable are assigned as fol-
lows:
3-wire connection cable
Wire color Terminal
Brown L
36
PE Ground
3-wire connection cable
Blue N
Green/yellow PE
5.6.3 Three-phase current motor
Fig. 5: Connection plan
L1
L2 Mains supply
L3
The three-phase current version can be equipped with
the following:
• float switch and CEE plug
• free cable end
The version with a plug is connected to the electricity
supply by plugging it into the electricity socket.
For the version with free cable ends, the connection to
the mains is made at the switch box terminals.
Electrical connections may only be made by a
qualified electrician!
The wires of the connection cable are assigned as fol-
lows:
6-wire connection cable
Wire no.
1
2
3
4
5
Green/yellow
5.6.4 Monitoring device connections
Each monitoring device must always be connected.
Temperature monitor for AC motor
With the AC motor, the temperature monitor is inte-
grated in the motor and is self-switching. The monitor
is always active and does not have to be connected
separately.
Temperature monitor for three-phase current motor
• Bimetal sensors can be directly connected in the con-
trol cabinet.
Connection values: max. 250 V(AC), 2.5 A, cos M = 1
When the threshold is reached, the unit must be
switched off.
For this reason, no warranty claims can be accepted for
damages to the winding resulting from unsuitable
motor monitoring.
Connecting the optionally available leak electrode for
the oil separation chamber
• The leak electrode must be connected via an evalua-
tion relay. We recommend the "NIV 101" relay for this.
PE Ground
20
Bimetal sensor
21
Terminal
Temperature monitoring
Temperature monitoring
U
V
W
Ground (PE)
WILO SE 10/2011 V4.1WE