Panasonic EBL128 Planning Instructions page 44

Panasonic Electric Works Nordic AB
MEW01090 Rev: 3
4370 Addressable short circuit isolator. In case of short circuit on the
COM loop, the number of disabled units will be minimised.
4370 is power supplied via the COM loop.
dimensions: (L x W x H) 90 x 70 x 32 mm.
protection cover is attached. The cover's dimensions: (L x W x
H) 128 x 72 x 45 mm. The unit is intended to be surface
mounted and for indoor use in dry premises. When required, the
unit can be mounted in a Waterproof box (IP66 / 67) 3362. The
unit has an input to manually open the isolator ("isolated state")
and an input to manually close the isolator ("normal state"). An
LED will indicate the normal and isolated state respectively.
For more information, see the Product Leaflet. The technical
address is set with an Address setting tool (AST) 3314. The
unit has an address label on which the programmed technical
address is to be written.
The Address setting tool 3314 is also used for mode setting:
NORMAL mode: Used for 4370 in EBL128.
2330 mode: Not used in EBL128.
2312 mode: Not used in EBL128.
According to the EN54 standard, at least one short circuit isolator is
required per 32 alarm points on the COM loop. In the Australian and
New Zealand conventions at least one isolator per 40 alarm points.
Up to eight 4370 and/or 4313 can be used, which gives nine loop
segments. Each isolator has to be given a Sequence Number, 0-7.
The isolators have to be connected consecutively (Sequence Number
0-1-2-3-4-5-6-7) in the COM loop's A-direction. NOTE! EBL128
has one built-in isolator in the-A direction (no. "A") and one in the B-
direction (no. "B").
EBL128
A Dir. 
B Dir. 
Figure 9. Two 4370 / 4313 isolators connected to the COM
loop gives three loop segments, i.e. Segment A (A-0), B (0-1)
and C (1-B). If one or more isolators are to be added the
sequence numbers have to be updated (via Win128), e.g. if one
isolator is to be put in between no. 0 and no. 1 in the figure, the
new isolator will be no. 1 and the old no. 1 will be no. 2.
Short circuit / cut-off (break) on the COM loop
See chapter "COM loop", page 15. See also chapter "Fault messages"
in the EBL128 Operating Instructions.
EBL128 Planning Instructions V1.1.x
Segment A
4370
no. 0
4370
no. 1
Segment C
42
The unit's
A plastic
Segment B