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flooding (the pump does not start)/destruction of the
pump due to dry run (the pump does not switch off).
When using separate floats for start of the pump, stop
of the pump and alarm the switch levels have to be
chosen as described above. The alarm float should switch
approximately 10 cm above the switch point of the pump,
however always below the input.
Important: After each change of the mounting of the float
a correct function of the float switch must be checked
with a test run.
Float switch for wire rope coupling
Pumps without float switch can be provided later with a
HOMA float switch for wire rope coupling. The electrical
connection is carried out by intercoupling the float switch
between the power socket and mains plug of the pumps.
If the float cable is installed later, fix it on the pump
according to the desired switch distance and the switch
level on the pump, the ascending pipe or another fixed
installed point. Under no circumstances the float with
the cable must be thrown into the medium, since correct
switch is only possible with a rotational movement of the
float around the mounting point of the cable. Possible con-
sequences in the event of non-compliance are flooding
(the pump does not start)/destruction of the pump due to
dry run (the pump does not switch off).
Important: After each change of the mounting of the float
a correct function of the float switch must be checked
with a test run.
5.3. Commissioning
This chapter contains all important instructions for oper-
ating personnel for safe commissioning and operation of
the machinery. The following must be complied with and
checked:
•
Type of installation
•
Operation mode
•
Minimal submersion in water / maximum submersion
depth
After a longer downtime these points must also be
checked and detected defaults must be repaired! The
operation and maintenance manual must always be
kept with the machinery, or in a dedicated place where
it is accessible for the entire operating personnel.
The following points must be taken into account to avoid
personal and material damage when troubleshooting
machinery failures:
The commissioning of the machinery must only
be carried out by qualified and trained personnel in
compliance with the safety regulations.
•
All personnel that is working on the machinery must
have received, read and understood the operating
instructions.
•
Activate all safety equipment and emergency
switch-offs before commissioning.
•
Electrotechnical and mechanical settings must only
be carried out by specialists.
•
This machinery is only suitable for the use under the
indicated operating conditions.
5.4. Preparation work
The machinery was constructed and fitted according to
the latest technology, so that it works for a long time and
reliably under normal operating conditions. This requires
however that you comply with all requirements and
information. Small oil leakages of the floating ring seals on
delivery are not problematic, but they must be removed
before lowering/immersion into the medium.
Please check the following points:
•
Cable run - no loops, slightly tightened
•
Check temperature of the medium and submersion
depth - see machinery data sheet
•
If a tube is used for pressure, this must be rinsed with
clear water so that no deposits lead to obstruction.
•
The pump pit must be cleaned for wet installation
•
The pressure-sided and suction-sided pipework
system must be cleaned and all gate valves must be
opened
•
The pump casing must be flooded, e.g. it must be
filled completely with the medium and it must not
contain an air. The de-aeration can be carried out by
means of suitable venting devices in the system or, if
available, by air-vent screws on the pressure socket.
•
Check accessories, pipework, suspension devices for
firm and correct fitting
•
Check available level controls/protection against dry
run
5.5. Electrical system
The respective local and VDE regulations must be
complied with when choosing and installing the electrical
leads as well as connecting the motor. The motor must
be protected with a circuit breaker. The motor must be
connected according to the wiring diagram. Note the
direction of rotation!
In the event of wrong direction of rotation the ma-
chine does not perform as indicated and it can become
damaged under unfavourable circumstances.
Electric shock hazard!
Faulty dealing with current may jeopardize your life!
All pumps with free cable ends must be connected by
a qualified electrician.
5.6. Direction of rotation
No check is required for single phase motors, since these
always run in the correct direction.
The direction of rotation must be checked in three phase
motors before commissioning.
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