Installation and operating instructions Wilo-Rexa PRO 25
COMMISSIONING
US English
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 installa-
tion and operating instructions for the level control
device, 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.
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 ap-
proval:
• Ex symbol
•
Ex classification, e.g. II 2G Ex d IIB T4
• Also note the additional information in the ap-
pendix!
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 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
• 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:
•
Clean the piping on the suction side – flush with
clean water to prevent deposits causing clogging.
• Open all slide valves on the pressure and suction
sides
If the slide valves on the suction and pressure
sides are closed during operation, the fluid in the
hydraulics housing is heated up by the pumping
movement. This heating creates strong pressure
in the hydraulics housing. The pressure can result
in the pump exploding. Before switching on the
pump, ensure that all the slide valves are open and
open any closed slide valves.
6.5.2.
Switching on/off
The pump is switched on and off using a separate
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 procedure
is finished, the current must not exceed the rated
current again.
If the motor does not start up, it must be switched
off without delay. Before switching it on again,
wait for the specified start pause and make sure to
rectify the fault.
6.6. Conduct during operation
When operating the pump, always follow the
locally applicable laws and regulations for work
safety, accident prevention, and handling electrical
machinery. To help ensure safe working practice,
the responsibilities of employees should be clearly
specified by the operator. All personnel are respon
-
sible for ensuring that regulations are observed.
Due to their design, centrifugal pumps have rotating
parts that are easily accessible. Depending on the
operating conditions, sharp edges can develop on
these parts.
WARNING: danger of crushing and amputation
of limbs!
Sharp edges can form on the rotating parts in
the hydraulics. These can result in crushing and
amputation of limbs. Never reach into the hy-
draulics when the machine is in operation.
Summary of Contents for Rexa PRO Series
Page 5: ...Fig 9 1...
