KROHNE UFM 3030 EEx EN - Manual (Page 14)

14 UFM 3030
3 Electrical connections
3.1 Safety instructions
These instruments are designed in accordance with IEC 61010-1 for Installation Category 2 and
Pollution Degree 2. Hazardous voltages are present within this product during normal operation.
They are designed for Protection Class I and should never be operated without protective earthing.
The instruments shall also never be operated with the covers removed. Always follow the basic and
local safety precautions when using these instruments to reduce the risk of injury from electrical
shock, spread of fire or other dangerous situations.
3.2 Power supply connection
When the UFC 030…-EEx flow converter is connected to the mains supply voltage, the following
environmental requirements must be maintained for safe operation:
a)
b)
c)
d)
e)
f)
g)
h)
i)
Suitable for indoor and outdoor use, protection category IP67 according to IEC 60529.
Use up to an altitude of 2000 m above see level.
Suitable for an operation ambient temperature range - 40°C to +65°C.
Suitable for an storage temperature range -40°C to + 80°C.
Suitable for use in atmospheres with a relative humidity up op 80%.
Mains supply voltage fluctuations for 100 – 240 V AC: -15 to +10%; 24 V AC: -10 to +15%;
DC: -25 to +33% of the specified voltage range.
Overvoltages up to category II on the main supply voltage (IEC 60364-4-443).
Connected to protective earth conductor (Protection Class I).
Rated pollution degree 2.
•
This instrument is intended for permanent connection to the mains supply. It is
required (e.g. for service) to mount an external switch or circuit breaker in the
proximity of the instrument for disconnection from the mains. It must be easily
reachable by the operator and marked as the disconnecting device for this
product. The switch or circuit breaker must be suitable for the application and
shall also be in accordance with the local (safety) requirements and of the
building installation. (IEC 60947-1 /-3).
•
The U-clamp terminal size M5, press-fitted in the terminal compartment (near
the mains connection terminals), for the protective earth conductor must
always be connected to the protective earth conductor of the mains supply.
Conductors up to 4 mm
2
(11 AWG) can be connected to this terminal. The
diameter of the conductors of the mains supply, including the protective earth
conductor shall be in accordance with the general and local requirements.
•
It is not allowed to use the protective earth terminal for any other connection
than the protective earth conductor.
•
IP67 is only warranted when suitable cabling is used with the cable glands and
covers mounted as specified.
3.3 Equipotential bonding
All ultrasonic flowmeters of the UFM 3030 series must always be incorporated within the
equipotential bonding system of the hazardous area. For this purpose it is provided with an external
PE-terminal. The external PE-terminal is located on the connecting flange at the bottom of the flow
converter housing and on top of the support of the flow sensor, just below the junction box.
A separate bonding conductor must be at least 4 mm
2
(11 AWG) or 2,5 mm
2
(14 AWG) in case it is
mechanical protected, see Clause 413 of HD 384.4.41 or IEC 364-4-41. Make sure that the core of
the bonding wire is properly mounted under the U-clamp of the PE-terminal and that the screw is
tightly fixed.