Electrical System; Rotation Control; Level Control; Operation In Potentially Explosive Areas - Wilo Rexa PRO Notice De Montage Et De Mise En Service

US English

6.1. Electrical system

Connect the pump and install the power supply
cables as described in the "Installation" section and
in accordance with applicable national regulations.
The pump must be properly protected and ground-
ed.
Ensure correct direction of rotation. If the direction
of rotation is incorrect, the pump will not perform as
specified and may be damaged.
Ensure all monitoring devices are connected and
have been tested.
DANGER: 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
markings.
A test run must be performed under general oper-
ating conditions!
6.2.1. Checking the direction of rotation
The direction of rotation must be checked by a
local electrician using a phase sequence tester. For
the correct direction of rotation, a clockwise phase
sequence must be present.
The pump is not approved for operation with a
counterclockwise phase sequence!
6.2.2. If the direction of rotation is incorrect
If the direction of rotation is incorrect for direct
start motors, two phases must be swapped. In the
case of motors with star-delta starting, the con-
nections 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 installation
and operating instructions for the level control de-
vice, as well as the planning documentation.

6.4. Operation in potentially explosive areas

If the pump is marked accordingly, it can be used
inside potentially explosive areas.
22
RISK of fatal injury due to explosion!
Pumps without Ex marking must 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 the relevant
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" section. This must be
checked before the system is switched on.
Minor oil leakage at the mechanical seal on delivery
is no cause for concern. However, it must be re-
moved prior to submersion in the fluid.
Keep people out of the pump's working area. No
persons should be allowed in the working area
during startup or operation.
If the pump falls over, it must be switched off be-
fore setting it up again.
WARNING: danger of crushing!
In portable installations, the pump can fall over
when it is switched on or during operation.
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 protec-
tion class.
6.5.1. Before switching on
• Check the following, in general:
• 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 causing 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
• The following points must also be checked in the
case of wet well installation:
• Clean the pump sump of coarse contaminants
• Open all slide valves on the pressure side
• The following points must also be checked in the
case of dry well installation:
COMMISSIONING
WILO SE 2014-11 V05 Letter