Motor Protection And Activation Types; Electrical System - Wilo Sub TWU 3 HS Serie Notice De Montage Et De Mise En Service

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3. Pull out the terminal, connect the power supply
cable to the "LINE" terminal and then replace the
terminal.
4. Fasten the protective earth conductor to the
earth terminal above the "LINE" terminal. To do
this, use a blade connector.
5. Replace the cover on the housing bottom and
screw the two screws back into the housing.
6. Now lead the power supply cable to the power
supply separator (main switch) or to the switch-
box. Make sure that the power supply cable is laid
securely and does not pose a danger
(e.g. loops that someone could trip on).
7. Connect the power supply cable to the power
supply separator (main switch) or the switchbox.
5.5.4 Connecting the monitoring equipment
The monitoring functions are implemented via
the frequency converter and do not have to be
connected separately.
Overview of monitoring devices
Function
Undervoltage
Overvoltage
Short-circuit
Temperature (frequency converter)
Dry run
Leakage*
Key:
• • = built-in
• - = to be provided by customer
• * = leakage detection is switched off in the factor
and has to be activated via the menu!
Please also refer to the "Setting the operating
parameters" section.
• In the "...-HS-ECP" variant with an external
frequency converter, the error messages are dis-
played on the frequency converter's display and
are confirmed/reset accordingly.
• In the "...-HS-I" variant with an internal frequency
converter, the pump is automatically switched off
when an error occurs. The pump is only switched
back on once the system is reset via the main
switch.

5.6 Motor protection and activation types

5.6.1 Motor protection
The motor protection is integrated in the fre-
quency converter:
• In the TWU 3-...-HS-ECP, the relevant value has
to be set via the frequency converter.
• In the TWU 3-...-HS-I, the value is preset.
We also recommend installing a residual-current
device (RCD).
Local and national regulations must be observed
when connecting the pump.
42
HS-ECP HS-I
• •
• •
• •
• •
• •
• -
5.6.2 Activation types
Direct activation
At full load, the motor protection should be set
to the rated current shown on the rating plate. At
partial load, we recommend that the motor pro-
tection be set 5 % above the current measured at
the duty point.
6 Commissioning
The "Commissioning" section contains all the
important instructions for the operating person-
nel for starting up and operating the pump.
The following general conditions must always be
met and checked:
• Installation type, including cooling (does a cooling
jacket have to be installed?)
• Operating parameters (for TWU 3-...-HS-ECP)
• Minimum water submersion / max. immersion
depth
These general conditions should also be
checked after a lengthy period of standstill, and
any defects detected are to be remedied!
Always keep this manual either by the pump or
in a place specially reserved for it, where it is ac-
cessible for the entire operating personnel at all
times.
In order to prevent damage or serious injury when
commissioning the pump, the following must be
observed:
• Commissioning of the pump may only be carried
out by qualified and trained personnel in accord-
ance with the safety instructions.
• All persons working on or with the pump must
have received, read and understood this operating
and maintenance manual.
• All safety devices and emergency cut-outs must
be connected and checked to ensure that they
work properly.
• Electrical engineering and mechanical adjust-
ments must be carried out by qualified personnel.
• The pump is suitable for use under the specified
operating conditions.
• The work area of the pump is not a recreational
area and is to be kept free of people! No persons
are allowed in the work area during start-up or
operation.
• Make sure a second person is present at all times
when you are working in wells and tanks. If there
is a risk of toxic gases forming, sufficient aeration
must be ensured.

6.1 Electrical system

Connect the pump and install the power supply
cables as described in the "Installation" section
and in accordance with the VDE guidelines and
applicable national regulations.
The pump must be properly protected and
earthed.
Observe the direction of rotation! If the direction
of rotation is incorrect, the pump will not perform
as specified and may be damaged.
COMMISSIONING
WILO SE 05-2019 DIN A4