KROHNE OPTIFLUX 4040 C Ex EN - Manual (Page 11)

ELECTRICAL CONNECTIONS
3
11
OPTIFLUX 4040 C
www.krohne.com 09/2010 - 7312232100 - AD EX OPTIFLUX 4040 C R01 en
3.3 Description of the output circuits
The terminal compartment of the OPTIFLUX 4040 C-EEx is, with respect to the explosion
protection, available in two versions. The version can be identified by the information that is
listed on the data plate, which is mounted on the signal converter housing.
Version A: terminal compartment "EEx de [ib]" with U Version A: terminal compartment "EEx de [ib]" with U Version A: terminal compartment "EEx de [ib]" with U Version A: terminal compartment "EEx de [ib]" with U
m m m m
= 60 V
The customer can decide in which type of explosion protection the output circuits - current
output, additional power supply and binary outputs (i.e. pulse and/or status outputs) - can be
driven: in type of protection "EEx ib", "EEx e" or "EEx d".
If type of protection EEx e or EEx d is used, the markings for "Intrinsically safe" - that are blue
o-ring around the cable gland and the blue sticker in the connection compartment - should be
removed.
The safety-technical maximum voltage U
m
(maximum effective AC or DC voltage) of the mains
power supply system for the terminal compartment in type of protection EEx de [ib] is restricted
to 60 V. With this maximum voltage it is guaranteed that the protective components on which the
intrinsic safety of these circuits depends are not overloaded. This condition is met if the mains
power supply system satisfies the PELV requirements in accordance with IEC 364 / IEC 536.
Version B: terminal compartment "EEx de" with U Version B: terminal compartment "EEx de" with U Version B: terminal compartment "EEx de" with U Version B: terminal compartment "EEx de" with U
m m m m
= 250 V
This version is intended for applications where the mains power supply system provides a
maximum safety-technical voltage of U
m
= 250 V. The terminals can either be provided with type
of protection increased safety "EEx e" according to EN 50019 or flameproof enclosure "EEx d"
conform to EN 50018. Type of protection intrinsical safety "EEx ib" is not allowed for this version.
Important notes (applicable for versions A and B)
• The intrinsically safe "EEx ib" internal electrode circuit is supplied by the IFC 040-EEx signal
converter electronics unit inside the electronics compartment. This circuit is separated from
all other circuits up to a maximum voltage of U
m
= 250 V according to EN 50020. The internal
electrode circuit with type of protection intrinsic safety "ib" is galvanically connected with the
PE (housing potential).
• The current output (terminals I, I
gnd
) and the additional power supply (terminals 1L=, 0L=)
must be galvanically separated from each other. To avoid voltage or current summation, at
least one of the two circuits must be isolated from earth potential. It is not allowed to drive
both circuits at the same time with grounded zener barriers. Both current circuits, including
all connection cables, must be galvanically separated at all times according to the valid
regulations.
• Also in case of non-intrinsically safe connections, it is absolutely necessary to maintain a
galvanic separation between the current output circuits and the additional power supply
connections.
WARNING!
It is not allowed to mix two different types of protection (e.g. current output in type of protection
"EEx ib" and pulse/status outputs in "EEx e" or "EEx d").
INFORMATION!
It is allowed to change the type of protection of the terminal compartment afterwards, if it is
garuanteed that the maximum voltage U
m
of the mains power supply system is always
limited at 60 V!