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After a longer downtime these points must also be checked and detected defaults must be repaired!
The following points must be taken into account to avoid personal and material damage when troubleshooting
machinery failures:
The commissioning of the machinery must only be carried out by qualified and trained personnel in
compliance with the safety regulations.
All personnel that is working on the machinery must have received, read and understood the
operating instructions.
This machinery is only suitable for the use under the indicated operating conditions.
5.4. Preparation 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
information. 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 system 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 regulations must be complied 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!
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 original switchgears are also available as accessories. When using other
switchgears the rated current of the motor must be considered when laying out the circuit breaker.
5.7. Switch-on types
Switch-on types with plug
Insert the plug into the socket provided for.
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:
operating voltage (permitted dev/- 5% of the rated voltage)
Frequency (permitted deviation -2% of the rated frequency)
Power input (permitted deviation between the phases maximum 5%)
Voltage difference between the individuals phases (maximum 1%)
Switching frequency and pauses (see technical data)
Minimum submersion in water, level control, protection against dry run
Smooth run
