Wilo Sub TWI 4 Serie Notice De Montage Et De Mise En Service page 36

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5.5.1 Corrective measures for avoiding excessive switch-
ing 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 deac-
tivation points. This prevents constant switching. This
function can be put into effect with a level control
relay.
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 accord-
ing 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. We recom-
mend using an earth leakage circuit breaker (RCD)
• Switching devices are to be purchased as accessories.
5.6.1 Technical details
• Activation type: Direct
• Power supply fuse: 10 A
• Cable cross section 4 x 1.5
Only slow-blow fuses or K characteristic automatic
cut-outs may be used for pre-fusing.
5.6.2 AC motor
The AC version is delivered with a factory-installed
start-up device. For connection to the mains, the
power supply cable is connected to the start-up device
(terminals L and N).
Electrical connections may only be made by a
qualified electrician!
36
5.6.3 Three-phase current motor
The three-phase current version is supplied 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:
4-wire connection cable
Wire color
black
brown
blue or gray
green/yellow
5.6.4 Monitoring device connections
The Wilo-Sub TWI series with AC motor has an inte-
grated thermic motor protection device. If the motor
becomes too hot, the unit is automatically shut down.
Once the motor has cooled down, the unit automati-
cally switches back on.
The customer must install a motor protection
switch.
The Wilo-Sub TWI series with three-phase motor has
no integrated monitoring devices.
The customer must install a motor protection
switch.
5.7 Motor protection and activation types
5.7.1 Motor protection
The minimum requirement is a thermal relay/motor
protection switch with temperature compensation,
differential triggering and an anti-reactivation device in
accordance with VDE 0660 or the appropriate national
regulations.
If the product is connected to electrical systems in
which faults frequently occur, we recommend install-
ing additional protective devices at the customer
(overvoltage, undervoltage or phase failure relays,
lightning protection etc.). We also recommend install-
ing an earth leakage circuit breaker.
Local and national regulations must be adhered to
when connecting the product.
5.7.2 Activation types
Direct activation
At full load, the motor protection should be set to the
rated current at the operating point (see type plate). At
partial load, we recommend that the motor protection
be set 5% above the current measured at the operat-
ing point.
Starting transformer/soft start
• At full load, the motor protection should be set to the
rated current at the operating point. At partial load, we
Terminal
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WILO SE 10/2011 V4.1WE