Toshiba Carrier BMS-IFBN1281U-UL Service Manual page 97

BN interface
11-2. When starting up BN interface
Problem
LED-L1 is lit
11-3. When Using BN interface
Problem
A request frame was sent to
the BN interface via BACnet
communication but no
response frame was
returned.
The time written in the
BACnet communication
response frame is slower
than the current time
Cause
There is an error in the settings file.
The unit addresses of the indoor units are
overlapped.
• The BN interface has stopped
communicating because the indoor units
are conducting their initial sequence
communication.
• The BN interface has been set to operate
in conjunction with another air
conditioning controller.
Cause
The BN interface internal software has
stopped.
The BN interface internal clock is slow.
Action
• Execute Air-Conditioning Search Mode
again.
CAUTION
The indoor units and outdoor units that are the
target of the search must be turned on when
Air-Conditioning Search Mode is executed.
Identify the overlaps in the addresses of the
indoor units and change the addresses.
• Check whether there is an air conditioning
unit for which only the indoor units are
powered on.
• In the case of a system for combination use
with another air conditioning controller, this is
normal. In the case that it is not a system for
combination use, check the settings of the
Setting File Creation Software2.
Action
After shutting down BN interface, reset the
power.
Send BACnet Time Synchronization Service
from Building Management System
to set the time.
Service Manual
-EN
97