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6. Maintenance
6.1. General
The machine and the entire system must be inspected
and maintained at regular intervals. The time limit for
maintenance is set by the manufacturer and applies to
the general conditions of use. The manufacturer should
be consulted if the system is to be used with corrosive
and/or abrasive pumped liquids, as the time limit between
inspections may need to be reduced.
Note the following information:
• The operating and maintenance manual must be
available to the maintenance personnel and its in-
structions followed. Only the repair and maintenance
measures listed here may be performed.
• All maintenance, inspection and cleaning work on the
machine and the system may only be carried out by
trained specialists exercising extreme care in a safe
workplace. Proper protective clothing is to be worn.
The machine must be disconnected from the electric-
ity supply before any work is carried out. There must
be no way that it can be inadvertently switched on.
• Above a weight of 100lbs, only hoisting gear which
has been officially approved and which is in a tech-
nically perfect condition should be used for lowering
and raising the machine.
Make sure that all fastening devices, ropes and safe-
ty devices are in a technically perfect condition. Work
may only commence if the auxiliary hoisting gear has
been checked and found to be in perfect working order.
If it is not inspected, danger to personnel may result!
• Wiring work on the machine and system must be
carried out by an electrician. For machines approved
for work in areas subject to explosion danger, please
refer to the “Explosion protection in accordance with
the regulation” chapter.
• When working with inflammable solvents and clean-
ing agents, fires, unshielded lighting and smoking are
prohibited.
• Machines which circulate fluids hazardous to health,
or which come into contact with them, must be de-
contaminated. It must be ensured that no dangerous
gases can form or are present.
• Ensure that all necessary tools and materials are
available. Tidiness and cleanliness guarantee safe and
problem-free operation of the machine. After work-
ing on the machine all cleaning materials and tools
should be removed from it. All materials and tools
should be stored in an appropriate place.
• Operating supplies such as oil and lubricants must
be collected in appropriate vessels and proper-
ly disposed. Appropriate protective clothing is
to be worn for cleaning and maintenance jobs.
Only lubricants expressly recommended by the
manufacturer may be used. Oils and lubricants should
not be mixed. Only use genuine parts made by the
manufacturer.
A trial run or functional test of the machine must be
performed as instructed in the general operating con-
ditions.
Oil type
: white mineral oil. Used oil is to be disposed ac-
cordingly.
When using white mineral oil, note the following:
• Machines which have previously been operated us-
ing other lubricants must first be thoroughly cleaned
before they can be operated using white mineral oil.
6.2. Maintenance intervals
Before initial start-up or after a longer period of
storage:
• Check insulation resistance
• Check oil level in seal chamber
• Check that impeller rotates freely by hand
Monthly:
• Monitor the amperage and voltage
• Check the used relays for proper operation
Every six months:
• Visual inspection of the power supply cable
• Visual inspection of the cable holder and the cable
bracing
• Visual inspection of accessories, e.g. the suspension
device and hoisting gears
8,000 operating hours or after two years, whichever
is earlier:
• Check the insulation resistance
• Check the lubricant in the seal chamber
• Functional inspection of all safety and control devices
15,000 operating hours or after five years, whichever
is earlier:
• General overhaul
If it is used in highly abrasive or corrosive material, the
maintenance intervals should be reduced!
6.3. Maintenance tasks
Monitoring the current consumption and voltage
The current consumption and voltage is to be monitored
periodically for all winding phases. This remains constant
during normal operation. Slight fluctuations are a result
of the composition of the pumped fluid. The current con-
sumption can assist in early detection and correction of
damage and/ or faulty operation in the impeller/propeller,
bearings and/or the motor. More extensive resulting dam-
age can thus be largely prevented and the risk of a total
failure can be reduced.