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COMMISSIONING
In order to prevent damage or serious injury when
commissioning the hydraulics, the following
points must be observed:
• Commissioning of the hydraulics may only be
carried out by qualified and trained personnel in
accordance with the safety instructions.
• All persons working on or with the hydraulics
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 engineering and mechanical adjust-
ments must be made by qualified personnel.
• The hydraulics is suitable for use under the speci-
fied operating conditions.
• 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
ELECTROCUTION hazard!
Improper electrical connections can lead to
fatal electric shocks. Electrical connections
may only be carried out by a qualified electri-
cian approved by the local energy supply
company, in accordance with locally applica-
ble regulations.
The standard motor is connected to the mains
and the power supply cables are routed in accord-
ance with the operating and maintenance manual
for the motor and in accordance with locally ap-
plicable regulations.
The hydraulics must be properly protected and
earthed.
Make sure all monitoring devices are connected
and have been tested.
6.2. Rotation control
If the direction of rotation is incorrect, the hy-
draulics will not perform as specified and may be
damaged. When you look at the hydraulics from
the front, they must rotate anticlockwise (see
direction of rotation arrow on the hydraulics).
Units delivered from the factory with a built-on
standard motor require a clockwise rotating field
to ensure the correct direction of rotation. The
rotating field can be checked with a rotating field
tester by a local electrician.
The hydraulics is not approved for operation
with a counter-clockwise rotating field!
The electrical connection must be completed in
accordance with the information in the operating
and maintenance manual for the motor.
There must be a test run without fluid and with
the slide valve on the suction side closed!
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
Installation and operating instructions Wilo-RexaBloc RE
windings must be swapped, e.g. U1 with V1 and
U2 with V2.
6.3. Operation in potentially explosive areas
The hydraulics must not be operated in an explo-
sive atmosphere!
6.4. Operation with frequency converters
NOTE
Also note all the information in the operating
and maintenance manual for the motor!
Operation on a frequency converter is possible.
The following parameters must be observed:
• The maximum speed must not exceed 1450 rpm.
• Continuous duty with a volume flow of
Q
< 0.7 m/s should be avoided.
opt
• The circumferential speed must not fall below
a minimum of 13 m/s.
NOTE
The circumferential speed can be calculated as
follows: v = n · d · π / 60,000
Key:
- n = speed in rpm
- d = impeller diameter in mm
- v = circumferential speed in m/s
6.5. Commissioning
The hydraulics must have been installed properly
as specified in the "Installation" chapter. This
must be checked before the system is switched
on.
The electrical connection must have been com-
pleted in accordance with the information in the
operating and maintenance manual for the motor.
In the version with a plug, note the plug's IP pro-
tection class.
6.5.1. Before switching on
Check the following:
• Min./max. temperature of the fluid
• Min./max. ambient temperature
• Suction- and pressure-side pipe system is free of
deposits and solids
• Open all slide valves on the pressure and suction
sides
If the slide valves on the suction and pres-
sure 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 hydraulics exploding.
Before switching on the hydraulics, ensure that
all the slide valves are open and open any closed
slide valves.
• The hydraulics housing must be completely filled
by the fluid and there must be no air in the hous-
ing. Venting is provided by a venting screw on the
pressure port.
• Check to ensure all accessories are properly fitted
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