English (GB)
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6. Safety
For safety reasons, all work in tanks must be supervised by a
person outside the pump tank.
Tanks for submersible sewage and wastewater pumps may
contain sewage or wastewater with toxic and/or disease-causing
substances. Therefore, all persons involved must wear
appropriate personal protective equipment and clothing, and all
work on and near the pump must be carried out under strict
observance of the hygiene regulations in force.
6.1 Potentially explosive environments
Use explosion-proof pumps for applications in potentially
explosive environments. See section 5.2.
Warning
Pump installation in tanks must be carried out by
specially trained persons.
Work in or near tanks must be carried out
according to local regulations.
Warning
Persons must not enter the installation area
when the atmosphere is explosive.
Warning
It must be possible to lock the mains switch in
position 0. Type and requirements as specified in
EN 60204-1, 5.3.2.
It is advisable to make all maintenance and
service jobs when the pump is placed outside the
tank.
Warning
Make sure that the lifting bracket is tightened
before attempting to lift the pump. Tighten if
necessary. Carelessness during lifting or
transportation may cause injury to personnel or
damage to the pump.
Warning
SL1 and SLV pumps must under no
circumstances pump combustible liquids.
Warning
The classification of the installation site must be
approved by the local fire-fighting authorities in
each individual case.
Special conditions for safe use of SL1 and SLV
explosion-proof pumps:
1. Make sure the moisture switch and thermal
switches are connected in the same circuit but
have separate alarm outputs (motor stop) in case
of high humidity or high temperature in the motor.
2. Bolts used for replacement must be class A2-70
or better according to EN/ISO 3506-1.
3. Contact the manufacturer for information on the
dimensions of the flameproof joints.
4. The level of pumped liquid must be controlled by
two level switches connected to the motor control
circuit. The minimum level depends on the
installation type and is specified in these
installation and operating instructions.
5. Make sure the permanently attached cable is
suitably mechanically protected and terminated in
a suitable terminal board placed outside the
potentially explosive area.
6. The sewage pumps have an ambient temperature
range of -20 °C to +40 °C and a maximum
process temperature of +40 °C. The minimum
ambient temperature for a pump with a
water-in-oil sensor is 0 °C.
7. The thermal protection in the stator windings has
a nominal switch temperature of 150 °C and must
guarantee the disconnection of the power supply;
the power supply must be reset manually.
8. The control unit must protect the WIO sensor
against short circuit current of the supply to which
it is connected. The maximum current from the
control unit must be limited to 350 mA.
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