Electrical System; Check The Direction Of Rotation; Level Controller; Operation In Explosion Hazard Areas - Wilo Drain MTC 32 Notice De Montage Et De Mise En Service

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6.1. Electrical system

Connect the product and the power supply cables
installed as described in the "Installation" section
and in accordance with the VDE guidelines and
applicable national regulations.
The product must be properly protected and
grounded.
Pay attention to the direction of rotation. If the
direction of rotation is incorrect, the unit will not
perform as specified and may be damaged.
Make sure all monitoring devices are connected
and have been tested.
ELECTRICAL hazard!
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 facto-
ry to ensure that the direction of rotation is incor-
rect. 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
general operating conditions. Switching on a
unit that has not been submerged is strictly
forbidden!
6.2.1. Checking the rotation direction
The rotation direction must be checked with a
rotating 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.
6.2.2. If the direction of rotation is not correct
When using Wilo switching devices
Wilo switching devices are designed so that the
connected products are driven in the right direc-
tion. If the rotation direction is wrong, 2 phases/
leads of the mains supply to the switching device
must be replaced.
With switching devices provided by the cus-
tomer
If the rotation direction is wrong, with direct start
motors, 2 phases must be swapped. In the case
of star-delta start-up motors, the connections of
two windings must be swapped e.g. U1 with V1
and U2 with V2.

6.3. Level controller

For correct adjustment, please see the installation
and operation manual for the level control device.
Note the following information:
• When using float switches, ensure that they can
move freely in the operating area.
• Make sure the cables are correctly laid.
• The water level must not fall below the minimum.
42
• The maximum starts per hour may not be exceed-
ed.

6.4. Operation in explosion hazard areas

The operator is responsible for defining the ex-
plosion hazard area. Only products with ex-ap-
proval may be used within an explosion hazard
area.
Attached switching devices and plugs must be
checked for use in explosion hazard areas.
Products that are ex-approved are labeled on the
name plate as follows:
• ATEX symbol
• Ex-classification, e.g. Ex d IIB T4
• Ex-certification number, e.g. ATEX1038X
RISK of fatal injury due to explosion!
Products without ex-labeling are not ex-ap-
proved and may not be used in explosion
hazard areas! All accessories (incl. attached
switching device/plugs) must be approved for
use in explosion hazard areas!
To keep dry motors sufficiently cooled when
they are not submerged, they must be flooded
completely before being switched back on!

6.5. Start-up

Minor oil leakage in the mechanical shaft seal on
delivery is no cause for concern. However, it must
be removed prior to submersion in the pumped
liquid.
Keep out of the work area of the unit. No per-
sons are allowed in the work area during start-
up or operation.
Before switching on for the first time, the in-
stallation must be checked as described in the
"Installation" section and an isolation check must
be carried out according to the "Maintenance"
section.
BEWARE of serious injuries!
In portable installations, the unit can fall over
when it is switched on or during operation.
Make sure that the unit is positioned on a
firm foundation and that the pump pedestal is
mounted correctly.
If the unit falls over, it must be switched off be-
fore setting it up again.
6.5.1. Before switching on
Check the following:
• Cable guidance – no loops, slightly taut
• Check the temperature of the pumped liquid and
the submersion depth – see "Technical data"
• If a hose is used on the discharge side, it should
be flushed out with clean water before use to
prevent any sediment causing blockages
• Clean coarse deposits from the pump sump
START-UP
WILO SE 2016-07 V4.0 DIN A4