A Single Break (Cut-Off) On The Com Loop - Panasonic EBL128 Planning Instructions

Panasonic Electric Works Nordic AB
MEW01090 Rev: 3
4.1.1
In case of short-circuit or a break (cut-off) on the COM loop, EBL128
will in order to localize it, do the following:
 The COM loop voltage and communication will be turned off.
Because of that all isolators will also be turned off, i.e. the L
(SA) contact in each isolator will be "open".
 The COM loop voltage and communication will be turned on
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again. The isolators will now be turned on one after another
in the A-direction, until it is not possible to turn on any more
isolator, i.e. the isolator closest to a short-circuit will not be
turned on alt. the isolator closest to (just before) a break will
be turned on but the isolator after a break can of course not be
turned on.
 The COM loop communication will now start in the B-
direction also and the isolators will be turned on one after
another, until it is not possible to turn on any more isolator,
i.e. the isolator closest to a short-circuit will not be turned on
alt. the isolator closest to (just before) a break will be turned
on.
 In case of short-circuit on the COM loop, only the segment(s)
between the now turned off isolators will be isolated.
 One or more fault messages will be shown in the EBL128
display, see below.
The fault messages will be different depending on if it is a single or
double break or short-circuit on the COM loop, as well as if there is
no one, one or several isolators connected on the COM loop, see
following chapters.
In any case, each unit not found by EBL128 will generate a fault:
FAULT: No reply xx-xx
Press "" to see the technical address.
FAULT: No reply techn. address xxx
Regarding Fault acknowledge,
Instructions.

A single break (cut-off) on the COM loop

If not all units are found when communicating in the A-direction
only, but when communicating in both directions, it must be a single
break (cut-off) on the COM loop. One fault will be generated and the
following fault message will be shown:
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Short-circuit on a COM loop with no isolators:
communication will not be turned on.
EBL128 Planning Instructions V1.1.x
see the
16
EBL128 Operating
The voltage and