Panasonic Eco Solutions Nordic AB
MEW01623 Rev: - EBL128 Operating Instructions V2.0.x
115
28.3 Service mode for COM-loop (H5/A3)
This mode can be used when commissioning an installation and by
maintenance. The COM loop communication (polling) will be turned
off but there is still voltage (24 V DC) on the loop in the A-direction
only, in the B-direction only or in both directions at the same time.
A volt meter can be used, e.g. to check the voltage / voltage drop on
different places on the loop or to find a single break on the loop.
(Since there is voltage on the loop, short circuit isolators will work
normally.)
It is recommended to do this check also when EBL128 is power
supplied via the backup battery only, since the battery voltage can be
different (compared with the rectifier voltage) due to the battery
condition, backup duration, etc.
The "Service mode for COM-loop" is indicated by LED
"Disablements" (L8).
When you press "Return" back to menu A3, the "Service mode for
COM-loop" will be terminated.
NOTE! If short circuit is detected on the loop when in service mode,
the loop will be disabled and a fault message will be displayed:
FAULT: SHORT CIRCUIT SCI A <-> SCI B
…independent of where on the loop the short circuit is situated.
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