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10.5.7. Danger due to hot surfaces
Hot surfaces can only occur in the case of an expected
malfunction. Here an operational heating to a maximum of
70% of the temperature classification limit T4 (135°C) can
be expected. However. If, in the case of a malfunction,
the temperature limit is reached, then the temperature
monitoring of the electric motor, which is connected with
the mechanical part (pump) by means of a common shaft
will force the whole unit to be separated from the grid.
Caution! As a preventive measure for the occurrence
of temperatures at the mechanical part of the sub-
mersible motor above the temperature classification
T4, a level safety system with a safety-integrity level
SIL2 is to be installed and checked. (see Chap. 4). The
safety system is to be programmed and switched
such that an operation of the unit is only permitted
with a prescribed medium cover of the pump hydrau-
lic of a minimum of 0.2 m.
10.5.8. Danger due to static charge
Under certain circumstances, electrostatic charge can
release flammable discharges. The HOMA explosion-pro-
tected submersible pumps contain no rechargeable insu-
lated conducting components such as plastics. In addition,
there is an external connection for generating the poten-
tial equalization which must be installed by the user. If
further components or elements installed in the ex-zone,
then the user is required as the most important measure
according to EN1127-1Para 6.4.7, to undertake the linking
and grounding of all conducting parts and substances.
10.6. Start-up
If all the required and previously described installations,
safety and process instructions are carried out, then the
pump system must be taken into operation by an electri-
cal technician and tested as follows:
Caution! In order to ensure that the pump system ac-
tually works as described in Para 2.2.3 of the applica-
tion conditions, a measurement of the power
consumption (KW)) is to be carried out and checked
with the information in the table in Appendix 1. As the
pump first pumps into an empty pipe system, a higher
power consumption will be set at the start of the
pumping, depending on the height and length. Let the
pump continue until a final and stable power
consumption is set.
If the power consumption is within the given pow-
er limits of the motor then the explosion-protected
submersible motor pump can be finally taken into
service. If it is then seen that the power consump-
tion is outside of the given power limits of the mo-
tor, then the explosion-protected submersible motor
pump must not be taken into service. In this case the
pipe characteristic of the installed pressure pipe is to
be calculated and determined. The actual operating
point of the plant can be determined with the use of
the in-house HOMA HOPSEL pump design program.
For safe and ex-conformity start-up contact an em-
ployee of the HOMA Company!
10.7. Repair, servicing and interventions into
explosion-protected submersible motors
For repairs or interventions, first observe the safety de-
terminations, especially those relevant for ex-protective
aspects as described above.
Who is permitted to repair ex-equipment?
Caution! Repair measures must only be carried out
by the works customer service or persons delegated
by us or workshops with an officially recognized „Au-
thorized person“
Gap dimensions
Caution! In the case of external repairs it is neces-
sary to obtain information on the model type approval
and the particular conditions, e.g. gap dimensions.
Gap surfaces must not be worked on!
Servicing intervals of ball bearings
Caution! Besides the operating instructions for servi-
cing intervals for non-explosion-protected submer-
sible motor pumps, the ball beatings must be repla-
ced at the latest after 25,000 hours. Depending on the
type of operation of the submersible motor pumps,
this time can be achieved in approximately 4 years.
Spare parts
Caution! In the purchasing of spare parts use only
the original spares mentioned in the appended parts
list. Especially the seals and cables are created in
part from temperature and aging-resistant materials.
Cable connection after repair
Caution! The cables are to be connected according
to the wiring diagram for the explosion-protected
submersible motor pumps to the ex-terminal board or
to the flameproof conductor bushing.
10.8. Technical data
For details see the general operating instructions with
data sheets. The data in the original type plate placed on
the machine should be entered In the adjoining depicti-
on of the type plate in order thus to be available for any
queries.
