Electrical Connection; Technical Information; Unit With Built-In Frequency Converter - Wilo Sub TWU 3 HS Serie Einbau- Und Betriebsanleitung

INSTALLATION
Separate reactivation point
A second switching point (additional 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
approved by the local energy supply company,
in accordance with locally applicable regula-
tions.
• 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 must be
connected and tested to ensure that it is working
properly.
• Earth the submersible pump according to the
regulations.
Units 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 earth 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 regula-
tions.
• A power supply separator (main switch) must be
provided by the customer.
• We recommend using a residual-current device
(RCD).
• Switchgears must be purchased as accessories.

5.5.1. Technical information

• Activation type: Direct
• Fuse on mains side: 16 A
• Cable cross-section, pump/frequency converter:
• Up to 30 m: 1.5 mm²
• From 30...90 m: 2.5 mm²
• Cable cross-section, power supply separator/fre-
quency converter:
• Up to 1.1 kW: 1.5 mm²
• From 1.2 kW: 2.5 mm²
• With cable lengths of 5 m or more, always use
a cable cross-section of 2.5 mm² in order to
avoid any interference due to voltage drop.
• Temperature resistance of the cable: max. 75 °C
• Only slow-blow fuses or K-type circuit breakers
are allowed to be used as the back-up fuse.

5.5.2. Unit with built-in frequency converter

(TWU 3-...-HS-I)
The version with built-in frequency converter is
delivered ex works with a connected power sup-
ply cable. This cable has to be extended, accord-
Installation and operating instructions Wilo-Sub TWU 3/High Speed
ing to the available space in the borehole, using
a shrinkage hose or cast resin connection, by the
customer before installation.
Before the power supply cable is connected to the
switchbox/main switch, the insulation resistance
must be measured again. This way, you can iden-
tify damage caused during installation.
• Measure with an insulation tester (measuring
voltage is 500 V) to measure the resistance of the
power supply cable and the motor winding.
• The resistance must not fall below the following
values:
• At initial commissioning: min. 20 MΩ
• During further measurements: min. 2 MΩ
If the insulation resistance is too low, it is possi-
ble that moisture has penetrated into the cable
and/or motor. Do not connect the pump again
and consult the manufacturer.
If the insulation resistance is OK, connect the unit
to the mains supply by connecting the power
supply cable to the switchbox.
Electrical connections may only be made by
a qualified electrician!
The wires of the connection cable are assigned as
follows:
3-wire connection cable
Wire colour
Brown
Blue
Green/yellow
5.5.3. Unit with external frequency converter
(TWU 3-...-HS-ECP)
The connection on the pump and mains side is
made at the frequency converter.
Electrical connections may only be made by
a qualified electrician!
Fig. 5.: Components on the frequency converter
1 Cover
2 Housing bottom
Threaded housing con-
3
nections
Threaded cable connec-
4
tions
Pump/frequency converter connection
The power supply cable connected at the factory
has to be extended, according to the available
space in the borehole, using a shrinkage hose or
cast resin connection, by the customer before
installation, and then connected to the frequency
converter.
Before the power supply cable is connected to
the frequency converter, the insulation resistance
must be measured again. This way, you can iden-
tify damage caused during installation.
Terminal
L
N
PE
5 Cable bushing
6 "MOTOR" terminal
7 "LINE" terminal
8 Earth terminal
English
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