Panasonic Electric Works Nordic AB
MEW01091
Rev: 3
EBL128 Operating Instructions V1.1.x
109
28.5
Service mode for COM-loop (H5/A5)
This mode can be used when commissioning an installation and by
maintenance. The COM loop communication (polling) will be turned
off but there will still be 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, depending on if 1, 2 or 3 is selected in this menu.
A volt meter can be used, e.g. to check the voltage / voltage drop on
different places on the loop. It is recommended to do this check also
when EBL128 is power supplied via the backup battery only, since the
voltage can be up to 3 V lower (compared with when it is power
supplied via the rectifier, i.e. via 230 V AC) due to the battery
condition, backup duration, etc.
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.
Action
Text in display
Comments
"Access"
According to chapter
"Access code for service
and maintenance", see
page 104.
Disconnect / Re-connect COM loop
ACCEPT? A1
Scroll to menu A5
Service mode for COM-loop
ACCEPT? A5
Press "A" to accept.
"A"
Service mode for COM-loop: 0
0=Off 1=A-dir 2=B-dir 3=Both ACCEPT?
Press:
0
=Service mode is off.
1
=Voltage in A-direction.
2
=Voltage in B-direction.
3
=Voltage in both direc-
tions.
1, 2 or 3 selected is
indicated by LED
"Disablements" (L8)
E.g. "1", "A"
Service mode for COM-loop: 1
0=Off 1=A-dir 2=B-dir 3=Both ACCEPT?
The communication is now
turned off on the COM
loop but there is still
voltage in the A-direction.
This state will last until
another alternative is
selected or the service
