Preparatory Work; Electrical System; Motor Protection; Switch-On Types - Homa C270 WF Originalbetriebsanleitung

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

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.
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. Motor protection

Single phase motor
Pumps with 230 V/single phase motors are provided with
one switchgear with circuit breaker, start capacitor and
operation condenser on delivery. These HOMA switch-
gears are also available as accessories. When using other
switchgears the rated current of the motor must be con-
sidered when laying out the circuit breaker.

5.7. Switch-on types

Switch-on types with plug
Insert the plug into the socket provided for.
Automatic humidity sensor switch
The pumps are provided with a humidity sensor switch
which already switches them on with a water level of 5
mm and pumps out the water to a level of 2 mm. The sen-
sor switch is connected to the pump via a cable.
The sensor contacts can be bridged by, for example, set-
ting up the sensors in a bowl of water. The electrodes
must be submerged in water for this method to function.
Attention: The pump is now no longer protected
against dry running. After successful residual empty-
ing, the pump must be disconnected from the grid
(pull plug) and the bridging of the electrodes must be
terminated.
5.7.1. 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.
The following points should be checked:
• Switching frequency and pauses (see technical data)
• Air entry at the inlet, if necessary a baffle plate must
be attached
• Minimum submersion in water, level control, protec-
tion against dry run
• Smooth run
• Check for leakages, if appropriate take the necessary
steps according the chapter 'maintenance'
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