Potentially Explosive Environments - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

7.4 Potentially explosive environments

In potentially explosive environments, use only FM-approved
pumps. All pumps are available as FM versions. FM pumps can
be used in hazardous areas classified as Class I, Division I,
Groups C and D with temperature class T3C for range 72, T3 and
T4 during frequency converter operation for range 74-78.
Special conditions for safe use of explosion
proof pumps:
Installation must comply with the requirements of the
National Electrical Code
manufacturer's installation and operating instructions
1. Make sure the moisture switches and thermal
switches are connected in two separate circuits
and 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 ASTM
F738M-01 (A4-80 or A2-80) according ISO 3506-
1.
3. The flame path gaps of the motor are specified by
the manufacturer and are narrower than
standard.
WARNING: In case of repairs, always use
original service parts from the manufacturer as
this ensures correct dimensions of the flame path
gaps.
4. During operation, the cooling jacket, when fitted,
must be filled with pumped liquid.
5. 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
FM
installation and operating instructions.
6. Dry-running is not allowed.
7. Make sure the permanently attached cables are
suitably mechanically protected and terminated in
a suitable terminal board.
8. The sewage pumps have an ambient temperature
range of 32-104 °F (0-40 °C) and a maximum
operating temperature 104 °F (40 °C).
9. If a WIO sensor is installed, the control unit must
protect the WIO sensor against short circuit
current from the power supply to which it is
connected. The maximum current from the
control unit must be limited to 350 mA.
10. The maximum submersion depth is 66 ft (20 m).
11. Dry-installed pumps often have a higher
temperature in the cable entries than submerged
pumps. This may reduce the lifetime of the Ex-
protection.
According to IEC/EN 60079-14, it is the
responsibility of the user, on a regular basis, to
inspect the condition of the permanently attached
cables and cable entries for any visual damage,
cracks or embrittlement caused by rubber aging.
12. The thermal protector in the stator windings must
have a rated switch temperature of 302 °F (150
°C) and must guarantee the disconnection of the
supply; resetting must be made manually.
18
®
(ANSI/NFPA 70) and this
DANGER
Explosive environment
Death or serious personal injury
- Make sure there is no damage, cracks or
embrittlement of the cable entries to avoid sparks
that can cause an explosion.
Special conditions for safe use of WIO sensor:
1. The control unit must protect the sensor against
short-circuit currents from the power supply to
which it is connected.
2. Install the WIO sensor in such a way that it is not
exposed to mechanical impact.
FM
3. The WIO sensor must not be used in oil with a
spontaneous ignition temperature below 482 °F
(250 °C).
4. The WIO sensor is approved according to EN/IEC
60079-18:2004. In FM and IEC applications, the
maximum current supplied to the sensor must be
limited to 350 mA according to IEC/EN 60079-
18:2004 and 60079-0:2004.