Wilo Wilo-Rexa NORM, Инструкция по установке и эксплуатации

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Installation and operating instructions Wilo-Rexa NORM 23
COMMISSIONING English
6.1. Electrical components
RISK of fatal injury due to electrical current!
Improper electrical connections can lead to
fatal electric shock. Electrical connections
may only be carried out by a qualified elec -
trician 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
accordance with the operating and maintenance
manual for the motor and with locally applicable
regulations.
The pump is properly fixed and earthed.
All monitoring devices are connected, and their
function has been tested.
6.2. Direction of rotation monitoring
If the direction of rotation is incorrect, the
hydraulics will not perform as specified and may
be damaged. When you look at the hydraulics
from the front, they must rotate counter-
clockwise (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 suitable 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 motors
with direct starting, 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. Operation in potentially explosive atmospheres
The hydraulics must not be operated in an explo-
sive atmosphere!
6.4. Operation with frequency converters
NOTICE
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 standard speed of the motor must not be
exceeded .
• Continuous duty with a volume flow of Q
opt
<0.7 m/s (27 in/s) should be avoided.
• The circumferential speed of the impeller must
not fall below a minimum of 13 m/s (42 ft/s).
NOTICE
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.
6.5.1. Before activating
Check the following points:
• The pump is suitable for use under the specified
operating conditions.
• Coupling guard is firmly installed on the base -
plate.
• Min./max. temperatures of the fluid
• Min./max. ambient temperature
• Suction- and pressure-side pipeline system is
free of deposits and solids
• All slide valves on the suction and pressure side
are open
If the slide valves on the suction and discharge
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 if necessary.
• The hydraulics housing is completely filled with
the fluid.
Caution! There must be no air pockets in the
hydraulics. Venting is provided by a venting
screw on the pressure port.
• Check to ensure all accessories are firmly and
properly fitted
6.5.2. Switching on/off
The standard motor is switched on and off using a
separate operating point (on/off switch, switch-
gear) provided by the customer.
See also the information in the operating and
maintenance manual for the motor!