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5.4. Preparatory 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 infor-
mations. 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 sys-
tem 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
An insulation test and a fill level check must be carried
out before commissioning.
5.5. Electrical system
The respective local and VDE regulations must be com-
plied 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 con-
nected according to the wiring diagram. Note the direction
of rotation! In the event of wrong direction of rotation the
machine does not perform as indicated and it can become
damaged under unfavourable circumstances.
Check the operating voltage and ensure a uniform current
consumption for all phases according to the machine data
sheet.
Make sure that all temperature sensors and monitoring
devices, such as sealed space controls, are connected
and checked for proper function.
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. Rotational direction
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. When using a HOMA
switchgear with LED for direction of rotation, this flashes
in the event of wrong direction of rotation.
30 | EngliSH
All manuals and user guides at all-guides.com
The check can be carried out by observation of the start-
jerk. For this, place the pump vertically onto the floor,
slightly onto the edge and switch on for a short time.
When seen from above, the pump rebounds slightly anti-
clockwise in correct direction of rotation.
The direction of rotation is correct if the pump moves an-
ticlockwise, since the motor starts clockwise when seen
from above. The check of the correct direction of rotation
in pumps that are already installed can be carried out by
comparison of the pumping height and the pumping quan-
tity with different directions of rotation.
The direction of rotation with the higher pumping height
and pumping quantity is the correct direction of rotation.
In the event of wrong direction of rotation two phases of
the power supply must be interchanged. As standard, the
pumps are delivered with CEE power plugs.
The interchange of phases is carried out by 180° rotation
of the round holding plate on the poles of the plug with a
screw driver.
The indicated conveying data and performance data can
only be achieved if a clockwise rotation field is present.
The machinery is not designed for operation in an anti-
clockwise rotation field.
5.7. Motor protection
The minimal requirement is thermal relay / circuit break-
er with temperature compensation, differential trigger
and anti-pumping device in accordance with VDE 0660/
respective local regulations. If the machinery is connect-
ed to electric circuits in which frequent interferences oc-
cur, we recommend additional installation of safeguarding
equipment (e.g. overvoltage relay, undervoltage relay or
phase failure relay, lightning protection, etc.). The local
and legal regulations must be complied with when con-
necting the machinery.
Single phase motor
Pumps with 230 V/1Ph motors are equipped with a con-
denser in the motor housing cover.
Three phase motor
Pumps with 3PH motors are equipped with a power con-
tactor in the motor housing cover.
5.8. Switch-on types
Switch-on types with plug
Insert plug into the provided outlet. Pump will start direct-
ly. When using a float switch, the pump will start as soon
as the float switch is triggered.
5.8.1. After switching on
The rated current is surpassed quickly during the start-up
process. After termination of this process the work current
should not exceed the rated current. If the motor does not
start immediately after switch-on, it must be switched off
immediately. Before further switch-on the switch pauses
according to the technical data must be complied with.
In the event of a further interference the machine must
be switched off immediately. A further switch-on process
may only be started after recovery of the fault.
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