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5.4. Preparatory work
The machine has been designed, constructed and assem-
bled in accordance with the latest state of the art so that,
under normal operating conditions, it will give long and
reliable service. It is a prerequisite for this, however, that
you comply with all requirements and instructions. Small
oil leaks at the slide ring seal on delivery are harmless, but
must be eliminated before being lowered or immersed in
the conveyed medium.
Please check the following points:
•
Cable routeing – no loops, slightly under tension
•
Check the temperature of the conveyed liquid and the
immersion depth – see machine data sheet
•
If a hose is used on the pressure side, it is to be
rinsed with clear water before use, so that no depos-
its can cause blockages
•
In a wet well installation, the pump sump is to be
cleaned
•
The piping system on the pressure and the suction
side is to be cleaned and all valves are to be opened
•
The pump housing must be flooded, i.e. it must be
completely filled with the medium, and there must
be no more air in it. Venting can be done with suitable
venting devices in the plant or with venting screws at
the discharge outlet, if present.
•
Check accessories, piping system and suspension ar-
rangement for secure and correct seating
•
Check the existing level control systems and/or.
dry-running protection
5.5. Electrical
The selection and laying of electrical lines and the connec-
tion of the motor must comply with the appropriate local
and VDE regulations. The motor must be protected with a
motor protection switch. Have the motor connected up in
accordance with the circuit diagram.
Pay attention to the direction of rotation. If the direction of
rotation is incorrect, the machine will not yield the stated
performance and, under unfavourable circumstances, it
may be damaged.
Danger due to electrical current.
Handling electricity improperly involves mortal dan-
ger. All pumps with free cable ends must be connect-
ed by a specialist electrician.
5.6. Direction of rotation
No check is necessary for 1ph motors , since these
always run in the correct direction of rotation.
The stated conveyance and performance specifica-
tions are only achieved if a clockwise rotating field is
present. The machine is not designed for operation
with a counterclockwise rotating field.
5.7. Ways of starting up
Ways of starting up with a plug /switchgear
Insert the plug into the appropriate socket and operate the
On/Off switch at the switchgear.
28 | ENGLISH
5.7.1. After switching on
The nominal current is briefly exceeded during the start-
up process. After this process ends, the operating current
should no longer exceed the nominal current. If after being
switched on the motor does not start immediately, switch
off immediately. Before switching on again, the switching
intervals stated in the technical data must be observed.
If there is another malfunction, the machine must be
switched off again immediately. It must not be switched
on again until the malfunction has been rectified.
The following points should be checked:
•
Working voltage (permissible deviation +/- 5% of the
rated voltage)
•
Frequency (permissible deviation -2% of the rated fre-
quency)
•
Current consumption (max. permissible deviation
between phases 5%)
•
Voltage difference between individual phases (max.
1%)
•
Switching rate and switching intervals (see Technical
data)
•
Air drawn in at the intake: a baffle plate must be
attached if necessary
•
Minimum water cover, level control system, dry-run-
ning protection
•
Smooth running
•
Check for leakages and, if appropriate, take the
necessary steps given in the „Servicing" section
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