Electrical System; Rotation Control; Level Control; Operation In Potentially Explosive Areas - Wilo Rexa CUT Serie Einbau- Und Betriebsanleitung

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• When working in pump chambers, a second per-
son must be present for safety reasons. Adequate
ventilation must be ensured if there is danger of
poisonous gases forming.

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
grounded.
Observe the direction of rotation. If the direction
of rotation is incorrect, the pump 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 pumps with free cable
ends (i.e. without plugs) must be connected
by a qualified electrician.

6.2. Rotation control

The pump is checked and adjusted in the factory
to ensure that the direction of rotation is correct.
The connection must be made according to the
wiring labels.
A test run must be performed under general op-
erating conditions!
6.2.1. Checking the direction of rotation
The direction of rotation must be checked with a
rotating field tester by a local electrician. For the
correct direction of rotation, a clockwise rotating
field must be available.
The pump is not approved for operation with a
counter-clockwise rotating field!
6.2.2. If the direction of rotation is incorrect
If the direction of rotation is incorrect for direct
start motors, 2 phases must be swapped. In the
case of star-delta motors, the connections of two
windings must be swapped, e.g. U1 with V1 and
U2 with V2.

6.3. Level control

Check that the level control device is installed
properly and inspect the switching points. For the
required information please refer to the instal-
lation and operating instructions for the level
control device, as well as the consulting docu-
mentation.

6.4. Operation in potentially explosive areas

If the pump is labelled accordingly, it can be used
inside potentially explosive areas.
48
RISK of fatal injury due to explosion!
Pumps without Ex labelling may not be used
in potentially explosive areas! There is a risk
of fatal injury due to explosion! Check your
pump before use to verify that it has corre-
sponding approval:
• Ex symbol
• Ex classification, e.g. II 2G Ex d IIB T4
• Also note the additional information in the
appendix!

6.5. Commissioning

The pump must have been installed properly as
specified in the "Installation" chapter. This must
be checked before the system is switched on.
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 fluid.
Keep out of the pump's work area. No persons
are allowed in the work area during start-up or
operation.
If the pump falls over, it must be switched off
before setting it up again.
WARNING: Danger of crushing!
In portable installations, the pump can fall
over when it is switched on or during opera-
tion. Make sure that the pump is positioned
on a firm bearing surface and that the pump
foot is mounted correctly.
In the version with a plug, note the plug's IP pro-
tection class.
6.5.1. Before switching on
Check the following:
• Cable guidance – no loops, slightly taut
• Min./max. temperature of the fluid
• Max. immersion depth
• Clean the pipe system on the pressure side (hose,
piping) – flush with clean water to prevent de-
posits forming clogging.
• The hydraulics housing must be completely filled
by the fluid and there must be no air in the hous-
ing. It can be vented by suitable venting devices
in the system or, if available, using vent screws on
the pressure port.
• Check switching points of level control and
dry-running protection systems
• Check to ensure all accessories are properly fitted
• Clean the pump sump of coarse contaminants
• Open all slide valves on the pressure side
6.5.2. Switching on/off
The pump is switched on and off using a sepa-
rate operating point (on/off switch, switchgear)
provided by the customer.
During the start-up procedure, the rated current
is temporarily exceeded. After the start-up pro-
cedure is finished, the current must not exceed
the rated current again.
COMMISSIONING
WILO SE 11-2014 V05 DIN A4