Direction Of Rotation; Motor Protection; Operation Of Static Frequency Converter; Types Of Startups - Homa MX-G Originalbetriebsanleitung

5.7. Direction of rotation

The machine connection must be performed according to
the circuit diagram. Testing the direction of rotation is ef-
fected by a rotating field testing device.
This is connected parallel to the connection of the pump,
and shows the direction of rotation of the existing rotating
field. In order 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
anticlockwise 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
noted:
• 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.

5.10. Types of startups

Types of startup using with cables with exposed ends
Direct start up
At full load, the motor protection circuit breaker should be
set to the rated current. In partial load operation is recom-
mended to set the motor protection circuit breaker 5%
above the measured current at the operating point.
46 | EngliSH
Star Delta starting
If the motor protection is installed in the line: Set the mo-
tor protection to 0.58 x rated current. The starting time
in the Y circuit must be set so that the nominal speed
is reached before switching over to the Δ circuit. This is
generally the case after 3 seconds. If the motor protection
is not installed in the line: Set the motor protection to the
rated current at full load.
Power up transformer/soft start
At full load, the motor protection should be set to the rat-
ed current. In partial load operation, it is recommended to
set the motor protection 5% above the measured current
at the operating point. The starting time must be max.
5s. The starting voltage is to be set at 40% of the rated
voltage according to the rating plate.
Operation with frequency inverters
The machine can be operated with frequency inverters.
Note section 5.9 of this manual.
Start up with plugs/switching devices
Plug the connector into the socket provided and press the
on/off switch on the switching device.
5.10.1. After turning on
The nominal current is briefly exceeded on start-up. Af-
ter completion of this operation, the operating current
should not exceed the nominal current. If the motor does
not start immediately after switching on, it must be shut
down immediately. The switch breaks specified in the
technical data must be adhered to before turning on again.
If there is a new fault, the machine must again be shut
down immediately. The machine may only be started up
again after troubleshooting.
The following items should be checked:
• Operating voltage (permissible deviation +/- 5% of
the rated voltage)
• Frequency (permissible deviation -2% of the rated
frequency)
• Current consumption (permissible deviation between
phases max. 5%)
• Voltage difference between the individual phases
(max. 1%)
• Switching frequency and pauses (see Technical Data)
• Air entry at the inlet - if necessary, a baffle plate must
be attached
• Minimum water coverage, level control, dry run pro-
tection
• Smooth running
• Check for leaks: if necessary, take the necessary
steps according to the chapter „Maintenance"