Units For Hazardous (Ex) Areas - Panasonic MEW01 351 Planning Manual

Panasonic Electric Works Nordic AB
MEW01351 Rev: -
9.1.5
9.1.5.1
Planning Instructions Fire alarm system EBL512 G3, V1.1.x
A-dir. 
no. A
EBL512 G3
no. B
B-dir. 
Figure 9. Two 4313 isolators connected to a COM loop gives
three loop segments, i.e. Segment A (A-00), B (00-01) and C
(01-B). If more isolators have to be added, the sequence
numbers have to be updated (via WinG3), e.g. if one isolator is
put in between isolator no. 00 and no. 01 in the figure, the new
isolator has to be no. 01 and the old no. 01 has to be no. 02.
Short circuit / cut-off (break) on the COM loop
See chapter "COM loop units", page 37.
Operating Instructions, chapter "Fault messages".

Units for Hazardous (Ex) areas

In hazardous (Ex) areas, Intrinsically Safe (IS) and approved products
are required. The IS alarm points are connected to an interface outside
the Ex area.
Normally the analog addressable units (IS smoke and heat detectors)
shall be used, else conventional units (e.g. IS manual call point).
Conventional units are connected via a Galvanic isolator MTL 5061
(2820) to an expansion board 4580 Ex zone line input. See also
drawings 512 G3 – 33 and – 37.
Analog / addressable units are connected to a COM loop via an IS
barrier unit 2842. See also drawing 512 G3 – 31.
Galvanic isolators / IS barrier units
MTL5061 Galvanic isolator (2820). The isolator is used to connect
conventional IS detectors and manual call points to an
expansion board 4580 zone line input (programmed in
"Resistor-Ex" mode). The isolator has two zone line inputs and
two outputs (Channel 1 & 2) and it is mounted in a Waterproof
box (IP66/67). Four compression glands for the cable entries
and an end-of-line resistor (10K) with an area >230 mm
supplied. Box dimensions (L x W x H): 175 x 125 x 150 mm.
BASEEFA classification: EEx ia IIC T
2842 Intrinsically safe (IS) barrier unit.
connect analog addressable IS detectors to a COM loop. The
unit has connectors for COM loop in / out, external power
supply (24 V DC, 60 mA) and one IS COM line for connection
40
This unit might still be under construction.
Segment A
4313
no. 00
4313
no. 01
Segment C
See also EBL512 G3
amb
40
The barrier unit is used to
50
Segment B
2
are
=60°C.