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26.3
Service Mode for COM-Loop (H5/A3)
This mode can be used when commissioning an installation and during maintenance. The
COM loop communication (polling) will be turned off but 24V
direction, the B-direction or in both directions at the same time.
A voltmeter can be used to check the voltage / voltage drop on different segments 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 also recommended to do this check when the power of FT1020G3 is supplied via the
backup battery only, since the battery voltage can be different (compared with the power
supply voltage) due to the battery condition, backup duration, etc.
The "Service mode for COM-loop" is indicated by LED Fault / Disablements "General
disablements" and the symbol
If the user stays in this menu window, without doing any actions, there will be a timeout
after 1 hour, and the user is logged off. If the user logs off this menu, the "Service mode for
COM-loop" will be terminated automatically.
Note: If short-circuit is detected when a COM loop is in service mode, the loop will be
disabled and a fault message will be displayed.
...independent of where the short circuit is situated on the loop.
Action
Text in display
"Menu"
Scroll to menu H5.
H5 Service
A1 Calibration of supervised output
"↲"
A2 Sensitive fault detection mode
A3 Service mode for COM-loop
A4 Display current consumption in control unit
A5 Display current consumption on COM-loop
A6 Display statistics for communication
A7 Activate address setting mode for DU
A8 Setup wireless detectors
A9 SSD information
Scroll to menu A3.
A3 Service mode for COM-loop
"↲"
Service mode for loop:
"↲"
Service mode control unit 00 COM-loop 0
Supplied from A-direction only
"ESC" or
A3 Service mode for COM-loop
"↲"
flashing.
FAULT: Short-circuit SCI A <-> SCI B,
loop x, Control Unit xx
0
CU: 00
A Direction
B Direction
Both
138
Operation Manual
FT1020G3 Rev 2.10.4
still on the loop in the A-
DC
Comments
According to chapter
"Access", see page 42.
Write loop and control
unit numbers. Use "▼"
or "▲" to scroll to the
required direction(s) and
press "↲".
When you leave this
menu by pressing "ESC"
or "↲" the service mode
will be terminated, i.e.
the communication will
return to the normal
mode.
Scroll to another menu or
press "ESC".
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