Motor Protection And Activation Types; Electrical System - Wilo Rexa FIT Serie Manual Del Usuario

The threshold is 30 kOhm. When the threshold is
reached, a warning must be given or the equipment
switched off.
Caution!
If there is only a warning, the unit could be irrep-
arably damaged by water entering. We always
recommend switching off!

5.7 Motor protection and activation types

5.7.1 Motor protection
The minimum requirement for three-phase motors is a
thermal relay/motor protection switch with tempera-
ture 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 shown on the type plate. At partial load,
we recommend that the motor protection be set 5%
above the current measured at the operating point.
Soft start activation
• At full load, the motor protection should be set to the
rated current at the operating point. At partial load, we
recommend that the motor protection be set 5%
above the current measured at the operating point.
• The current consumption must be less than the rated
current during the entire operation period.
• Because of the upstream motor protection, the motor
should be started and stopped within 30 seconds.
• To avoid power losses during operation, bypass the
electronic starter (soft start) after normal operation has
been established.
Operation with frequency transformers
The product may not be operated on frequency trans-
formers.
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
Installation and operating instructions Wilo-Rexa FIT...
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 prod-
uct or in a place specially reserved for it, where it is
accessible for the entire operating personnel at all
times.
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 main-
tenance 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.
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