Preparatory Work; Electrical; Direction Of Rotation; Motor Protection - Homa MX-ET Serie Originalbetriebsanleitung

To avoid injury to persons or damage during operation of
the machine, the following points must be observed:
The initial operation may only be carried out by
qualified and trained personnel following the safety
instructions.
• All staff working on the machine must receive, read,
and understand the instructions.
• Activate all safety devices and emergency stop
switches before initial operation.
• Electrical and mechanical adjustments may only be
performed by professionals.
• This machine is only suitable for use at the specified
operating conditions.

5.5. Preparatory work

The machine has been using state of the art technology
and has been constructed so that it will operate reliably
and for long periods under normal operating conditions.
This requires, however, that you comply with all advice
and instructions. Small oil leaks from the mechanical seal
during operation are harmless, however, must be removed
before lowering or immersion into the pumping medium.
Please check the following points:
• Cable routing - no loops, slightly taut
• Liquid temperature and immersion depth check - see
machine data sheet
• If a hose is used on the discharge side, it should be
flushed before use with fresh water so that no depos-
its cause blockages
• For wet installation, the sump pump must be cleaned
• The pressure and suction side pipe systems are to be
clean and all slides are to be opened.
• The pump casing must be flooded, i.e. it must be
completely filled with the medium and there may be
no more air in it. The venting can be done by suitable
ventilation devices in the system, or, if available, by
venting screws at the outlet nozzle.
• Check the accessories, pipe system and suspension
unit for firm and correct fit
• Review the present level control or dry run protection
An insulation test and a level control must be
carried out before commissioning.

5.6. Electrical

When installing and selection of electric lines and when
connecting the motor, the relevant local and VDE regu-
lations must be observed. The motor must be protected
by a motor protection circuit breaker. Connect the motor
connect as per the wiring diagram. Pay attention to the
direction of rotation! If rotation is in the wrong direction,
the machine will perform to specifications, and can be
damaged under adverse circumstances.
Check the operating voltage, and ensure there is uniform
power consumption by all phases in accordance with the
machine data sheet.
Make sure that all temperature sensors and monitoring
devices, e.g. sealing chamber control, are connected and
tested for function.
36 | ENGLISH
Risk of electrocution!
Improper use of electricity can be fatal! All pumps
with exposed cable ends must be connected by a
qualified electrician.

5.7. Direction of rotation

The machine connection must be performed according
to the circuit diagram. Testing the direction of rotation is
effected by a rotating field testing device. This is connect-
ed parallel to the connection of the pump, and shows the
direction of rotation of the existing rotating field. In or-
der for the machine to work correctly, there must be a
clockwise rotating field. If an anticlockwise rotating field is
displayed, two phases must be swapped.
The stated specifications and performance data can
only be achieved if there is a clockwise rotating field.
The machine is not designed for if there is an anticlock-
wise rotating field.

5.8. Motor protection

The minimum requirement is a thermal relay/motor pro-
tection circuit breaker with temperature compensation,
differential triggering, and reclosing lock in accordance
with VDE 0660 or similar national regulations. If the equip-
ment is connected to power grids where problems often
occur, we recommend the additional use of protective
devices (e.g. overvoltage protection or under voltage pro-
tection or phase failure relays, lightning protection, etc.).
When connecting the machine, the local and legal require-
ments must be adhered to.

5.9. Operation of static frequency converter

For inverter operation, the following points should be not-
ed:
• The pump is suitable for use with inverters according
to DIN EN 60034-17
• Voltage peaks at the motor coil must be avoided, and,
where appropriate, provide suitable filters should be
fitted in the motor cable
• Ensure the entire system is properly grounded.
• The specifications of the frequency inverter manufac-
turer are to be observed
• Under certain circumstances, shielded cable compli-
ant with EMC regulations is required
• The leaflet „use of HOMA pumps with frequency
converters" should be observed
Minimum speed in sewage and drainage pumps
With wastewater and drainage pumps, no minimum
speed is specified. However, it is important to ensure that
the unit is working jolt and vibration free, particularly at
lower speed ranges. The seals might otherwise be dam-
aged and leak. In addition, it must be ensured that the
minimum flow rate is not less than 0.7 m/s.