Electrical System; Check The Direction Of Rotation; Checking The Rotation Direction - Wilo Sub TWI 4 Serie Einbau- Und Betriebsanleitung

recommend that the motor protection be set 5%
above the current measured at the operating point.
• The minimum required cooling flow speed must be
guaranteed at all operating points.
• The current consumption must be less than the rated
current during the entire operation period.
• The ramp time for start/stop processes between 0 and
30 Hz must be set to max. 1 second.
• The ramp time between 30 Hz and the rated frequency
must be set to max. 3 seconds.
• The voltage at the start must measure at least 55% of
the rated motor voltage (recommended: 70%).
• To avoid power losses during operation, bypass the
electronic starter (soft start) after normal operation
has been established.
Operation with frequency transformers
• Continuous operation can only be guaranteed between
30 Hz and 50 Hz.
• To ensure the bearings remain lubricated, a pump out-
put of 10% of the rated pump output must be main-
tained!
• The ramp time for start/stop processes between 0 and
30 Hz must be set to max. 2 seconds.
• A period of at least 60 seconds is recommended
between a pump stop and restart to allow the motor
winding to cool down.
• Never exceed the rated current on the motor.
• Maximum voltage peak: 1000 V
• Maximum voltage rise speed: 500 V/rs
• Additional filters are required when the required con-
trol voltage exceeds 400 V.
Products with plugs/switching devices
Insert the plug into the plug socket and press the on/
off switch or let the product switch on/off automati-
cally by means of the attached level control system.
Switching devices can be ordered as accessories for
products with free cable ends. In this case, also observe
the instructions enclosed with the switching device.
Plugs and switching devices are not flood-proof.
Note the IP protection class. Always install
switching devices in such a way that they are
protected from flooding.
6 Startup
The "Start-up" chapter contains all the important
instructions for the operating personnel for starting up
and operating the product safely.
The following constraints must be adhered to and
monitored:
• Type of installation
• Operating mode
• Minimum water coverage / max. submersion
If the machine has not been operated for an
extended period, these constraints must also be
checked and any discovered faults rectified.
This manual must always be kept either by the product
or in a place specially reserved for it, where it is accessi-
ble for the entire operating personnel at all times.
Installation and operating instructions Wilo-Sub TWI 4..., TWI 4...-QC
In order to prevent damage or serious injury when
starting up the product, the following points must
always be observed:
• The product may only be started up by qualified,
trained persons. The safety advice must be followed at
all times.
• All persons working on or with the product must have
received, read and understood this operating and
maintenance manual.
• All safety devices and emergency cut-outs are con-
nected and have been checked to ensure that they
work properly.
• Electrical and mechanical settings must be made by
specialist staff.
• The product is suitable for use under the specified
operating conditions.
• The work area of the product is not a recreational area
and is to be kept free of people! No persons are allowed
in the work area during switching on and/or during
operation.
• A second person must be present when working in
shafts. Adequate ventilation must be ensured if there
is danger of poisonous gases forming.

6.1 Electrical system

The product is connected and the power supply cables
installed in terms of the "Installation" chapter as well as
the VDE guidelines and the applicable national regula-
tions.
The product is protected and grounded properly.
Pay attention to the direction of rotation. If the direc-
tion of rotation is incorrect, the unit will not perform as
specified and can sustain damage.
All monitoring devices are connected and have been
checked to ensure that they work properly.
Beware of electrical current!
Electrical current can cause fatal injuries if not
handled correctly! All products with free cable
ends (i.e. without plugs) must be connected by a
qualified electrician.

6.2 Check the direction of rotation

The product is checked and adjusted in the factory to
ensure that the direction of rotation is incorrect. The
connection must be made according to the wiring code
information.
Before submerging, the product must be checked to
ensure that the rotation direction is correct.
A test run should only be performed under gen-
eral operating conditions. Switching on a unit
that has not been submerged is strictly forbid-
den!

6.2.1 Checking the rotation direction

The rotation direction must be checked with a rotat-
ing field tester by a local electrician. For the correct
rotation direction, a clockwise rotating field must be
available.
The product is not approved for operation with a
counter-clockwise rotating field.
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