Potentially Explosive Environments; Installation - Grundfos SE1 50 Montage- Und Betriebsanleitung

6. Safety
Warning
Pump installation in pits must be carried out by
specially trained persons.
Work in or near pits 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.
For safety reasons, all work in pits must be supervised by a
person outside the pump pit.
It is advisable to make all maintenance and service
Note
jobs when the pump is placed outside the pit.
Pits 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.
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.

6.1 Potentially explosive environments

Use explosion-proof pumps for applications in potentially
explosive environments. See section 5.2.
Warning
SE1 and SEV 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 SE1 and SEV
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
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 +40 °C. The minimum
ambient temperature for a pump with a water-in-
oil sensor is 0 °C.
7. The thermal protector 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 the short circuit current of the supply to
which it is connected. The maximum current from
the control unit must be limited to 350 mA.

7. Installation

Caution
Prior to installation make sure the pit bottom is even.
Warning
Before beginning the installation, switch off the
power supply and lock the mains switch in position 0
with a padlock to ensure that the power supply
cannot be accidentally switched on.
Any external voltage connected to the pump must be
switched off before working on the pump.
Warning
The pump must not run dry.
An additional level switch must be installed to ensure
that the pump is stopped in case the stop level switch
is not operating.
Before beginning installation procedures, carry out these checks:
• Does the pump correspond to order?
• Is the pump suitable for the supply voltage and frequency
available at the installation site?
• Are accessories and other equipment undamaged?
Fix the extra nameplate supplied with the pump at the installation
site or keep it in the cover of this booklet.
All safety regulations must be observed at the installation site,
e.g. the use of blowers for fresh-air supply to the pit.
Prior to installation, check the oil level in the oil chamber.
See section 10. Maintenance and service.
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