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Beschikbare talen
Beschikbare talen
A connection with minimum 4 mm2 must be installed to
the submersible motor pumps for the potential equaliza-
tion according to EN 60079-14. The cable is connected to
this by means of lugs and screw security of the connecti-
on must not be self-loosening.
All existing thermal, level and detector sensors must
connected according to the instructions of this manual
and the accompanying circuit diagram.
Special conditions for safe operation
For the converter operation it is necessary to have an ar-
rangement for direct temperature monitoring. This con-
sists of a PT thermistor built into the coil according to DIN
44 082 with switching temperature according to Table 1
and a function-tested triggering device according to RL
94/9/EG. The switching is to be designed such that when
reaching the limiting temperature, the submersible motor
is switched off and a renewed start-up of the submersib-
le motor is only possible manually! When checking the
gaps of the pressure-tight enclosed motor, it is absolutely
necessary to contact the manufacturer of the submer-
sible motor in order to obtain the gap dimensions. The
gap of the tested submersible motor is less than that
prescribed by the standards.
The fastening bolts of the motor are special bolts of
stainless steel type A2-70.
10.5 Installation and start-up of explosion-protected
submersible motors
General information
Caution! Before starting any activity at the site of the
equipment, it is important to obtain knowledge on the
status of the danger of explosion from the user. The
danger potential can be estimated on the basis of of-
ficial zone allocation or an existing explosion protec-
tion document. Possibly a comparison should be
made between the ex-ignition type of the equipment
and the given requirements. In the case of enclosed
spaces of shafts, sufficient ventilation must be ensu-
red before starting work in order to thus prevent the
existence of explosive gases.
HOMA explosion-protected equipment must only be
used in areas (potentially explosive atmospheres)
which are applicable for their declared equipment
group II and category 2G, as well as maximum sur-
face temperature of 135°C for temperature classifi-
cation T4 (for frequency converters operation 200°C
for temperature classification T3) in accordance with
IEC 60079-0 for gases and explosion groups A and B.
Installation information for the electrical part
Caution! It is absolutely necessary that, in addition to
this instruction manual, attention is also paid to the
information in the EU type examination certificate in
the Appendix as is mentioned here again.
54 | EngliSH
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10.5.1. Electrical connection
The connection of the power cables may only be carried
out inside the potentially explosive areas by means of sui-
table ex-tested and certified terminal boxes.
10.5.2. Monitoring arrangements
Additional and monitoring arrangements with suitable ve-
rification and explosion protection labeling are to be selec-
ted according to the conditions at site. Monitoring units
must satisfy the requirements of the ATEX 100a, Appen-
dix II, Sections 1.5.5 and EN 1127-1 (potentially explosive
atmospheres - Explosion protection - Part 1: Fundamen-
tals and methods). In the case that in the explosion-pro-
tected submersible motor pumps electrical monitoring
sensors are installed outside the enclosed chamber, then
their control circuits must be carried out inside the motor
by the manufacturer in the ignition protection type intrin-
sic safety „i" according to EN 60079-11:2007.
A potential equalization is installed in the whole intrinsical-
ly safe circuits. A further grounding of the ex-intrinsically
safe circuits is not permissible. The use of this equipment
may only be carried out in the ex-area of the device group
II category 2 when certified ex-intrinsically safe electrode
relays are used and an intrinsically safe circuit of the igni-
tion protection type EX [ib] with the following values has
been used:
•
•
•
The effective internal inductivity Li and the capacity Ci are
negligibly small. In automatic operation with float swit-
ches, these must be installed according to VDE 0165 as
intrinsically safe circuits in the ignition protection type
intrinsically safe „i" and connected to an ex-intrinsically
safe transistor relay.From motor sizes AM303 there is
built in as standard and in accordance with previously de-
scribed protective measures, each a conductivity probe
and a magnetic buoyancy floating switch (only for vertical
operation) in the oil bearings. A temperature excess above
130°C (T4) at the seals as well as at the housing surface
is safeguarded according to the measures mentions in
Section 4.3!
10.5.3. Operating off the grid
It is also absolutely necessary that for operating off the
grid to install with thermally delayed excess power trig-
gers also temperature limiters with the strand designa-
tions T1 and T2 to the controls in accordance with the
connection diagram!
10.5.4. Frequency converter operation
For frequency converter operation it is absolutely neces-
sary to install an arrangement for direct temperature mo-
nitoring. This consists of a PT thermistor built into the coil
according to DIN 44 082 and a function-tested triggering
device according to RL 94/9/EG.
Ui = 28 V max
Ii = 300 mA max
Pi = 1.3 W max
Caution! In ex intrinsically safe circuits the instru-
ment lines are marked in blue.
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