Motor Protection And Activation Types; Start-Up - Wilo Drain MTC 32 Notice De Montage Et De Mise En Service

START-UP

For this reason, no warranty claims can be ac-
cepted for damages to the winding resulting from
unsuitable motor monitoring.
Motor chamber leak monitor (MTC 32F17...F33
only):
• The seal integrity electrode in the motor cham-
ber must be connected via an evaluation relay.
We recommend the "NIV 101" relay for this. The
threshold is 30 kOhm. When the threshold is
reached, the unit must switch off.
Connecting the optionally available leak elec-
trode for the oil separation chamber
• The leak electrode must be connected via an
evaluation relay. We recommend the "ER 143" re-
lay for this. When used outside explosion hazard
areas the "NIV 101" relay is suitable. The thresh-
old is 30 kOhm. When the threshold is reached, a
warning must be given or the unit switched off.
CAUTION!
If there is only a warning, the unit could be
irreparably 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 motors with a free
cable end is a thermal relay/motor protection
switch with temperature compensation, differ-
ential 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
installing additional protective devices at the
customer (overvoltage, undervoltage or phase
failure relays, lightning protection etc.). We also
recommend installing a residual current 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 name plate.
At partial load, we recommend that the motor
protection be set 5% above the current measured
at the operating point.
Star-delta activation
If the motor protection is installed in the motor
line: Set the motor protection to 0.58 x the rated
current.
If the motor protection is installed in the mains
supply line: Set the motor protection to the rated
current.
Installation and operating instructions Wilo-Drain MTC 32
The maximum start-up time in star-connection is
3 seconds.
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
transformers.
6. Start-up
The "Start-up" section contains all the important
instructions for the operating personnel for start-
ing up and operating the product safely.
The following conditions must be observed to and
monitored:
• Type of installation
• Operating mode
• Minimum water coverage/max. submersion
If the machine has not been operated for an
extended period, also check these conditions
and rectify and identified faults.
Always keep this manual must 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 quali-
fied, 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 must
be connected and checked to ensure that they
work properly.
• Electrical and mechanical adjustments 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 start-up or
operation.
• A second person must be present when working
in shafts. Adequate ventilation must be ensured if
there is danger of poisonous gases forming.
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