Toshiba Carrier BMS-IFBN1281U-UL Service Manual page 95

BN interface
11
Troubleshooting
11-1. During test runs
Problem
No indoor units can be found
(The number of indoor units
in the search results file is 0)
The central control address
of indoor units is duplicated.
(Error message in search
results file)
Indoor unit information could
not be acquired.
(Error message in search
results file)
The central controller ID of
the Uh Line compatible
central control device and
the central controller ID of
the BN Interface are
duplicated.
(Error message in search
results file)
When operation of an indoor
unit is performed from a
central monitoring system, a
different indoor unit goes into
operation state.
Cause
The indoor units and outdoor units are
turned off.
The indoor units and outdoor units are
performing initial communication so cannot
be communicated with.
(The LINK(Uh) LED is not blinking at all)
The Uh Line communication cable is not
wired correctly.
No central control address is set to the
indoor units.
When indoor units cannot be communicated
with after using Setting File Creation
Software2 to change "Central controller ID
setting" to "Old controller" and upload it to
the BN interface.
TU2C-LINK compatible outdoor units have
judged the communication protocol of the
Uh line as TU2C-LINK.
When indoor units cannot be communicated
with after using Setting File Creation
Software2 to change "Central controller ID
setting" to "Old controller" and upload it to
the BN interface.
The central control addresses of TU2C-LINK
compatible indoor units are set as 65—128.
Multiple indoor units are set to the same
central control address.
Uh Line communication did not work
The same central controller ID is set.
The central control address, Line address,
or unit address of indoor units has been
changed after a test run of the BN interface.
Action
Check that the indoor units and outdoor units
are turned on.
Check that the indoor units and outdoor units
are turned on.
Check that 10 minutes or more has passed
since the units were turned on.
Check that the wiring is correct.
Check that a central control address is set to the
indoor units.
Re-start the TU2C-LINK compatible outdoor
units.
Change the central control addresses of TU2C-
LINK compatible indoor units to 1-64.
Check that the central control address for each
indoor unit is set correctly.
Check that the Uh Line communication
termination resistance is set.
Try searching for air conditioners again.
Change the central controller ID.
Change the central controller ID of the BN
interface with Setting File Creation Software2.
The central controller ID at the time of factory
shipping is central controller ID 20.
Check the central control address, Line
address, and unit address of indoor units
If the central control address, Line address, or
unit address of any indoor units has been
changed, perform the procedure of "9 Test run".
Service Manual
-EN
95