OM 1263 • MICROTECH UNIT CONTROLLER 70 www .DaikinApplied .com
Troubleshooting
Troubleshooting Module-to-Module Communication
There are three status parameters on the HMI that are
designed to aid in diagnosing communication problems
related to the IFB board . These are IFBCommStatus=, ACS1
DataRcvd= and ACS3 DataRcvd= and are described below .
IFBCommStatus
The IFB communication status parameter indicates problems
with the communication between the MicroTech III controller
and the INV, OF1, OF2 and the EVB devices via the IFB board .
There are 13 possible conditions indicated by this parameter .
These are described as follows:
OK:
All communications related to IFB Board is OK
OF2Err:
Communication between the A5P board controlling
OF2 and the ACS1 communication loop has been interrupted
for 65 seconds after communication had initially been
established . Since a break anywhere in the communication
current loop will result in an ACS1Err (described below) this
indicator generally suggests a defect in the A5P board .
OF1Err:
460/575V Unit
—Communication between the A5P board
controlling OF1 and the ACS1 communication loop has
been interrupted for 65 seconds after communication
had initially been established . Since a break anywhere in
the communication current loop will result in an ACS1Err
(described below) this indicator generally suggests a defect in
the A5P board .
208/230V Unit
—Communication between the A4P board
controlling OF1 and the ACS1 communication loop has
been interrupted for 65 seconds after communication
had initially been established . Since a break anywhere in
the communication current loop will result in an ACS1Err
(described below) this indicator generally suggests a defect in
the A4P board .
OF12Err:
460/575V Unit
—Communication between both of the A5P
boards controlling OF1 and OF2 and the ACS1 communication
loop has been interrupted for 65 seconds after communication
had initially been established . Since a break anywhere in
the communication current loop will result in an ACS1Err
(described below) this indicator generally suggests a defect in
both the A5P boards .
208/230V Unit
—Communication between the A4P board
controlling OF1 and the A5P board controlling OF2 and
the ACS1 communication loop has been interrupted for 65
seconds after communication had initially been established .
Since a break anywhere in the communication current loop will
result in an ACS1Err (described below) this indicator generally
suggests a defect in both the A4P and A5P boards .
INVErr:
Communication between the A4P board controlling
inverter compressor (INV) and the ACS1 communication loop
has been interrupted for 20 seconds after communication had
initially been established . If this indicator remains active more
than 120 seconds it generally suggests a defect in the A4P
board .
NOTE:
A break anywhere in the communication current loop
will result in an ACS1Err (described below) .
ACS3Err:
The ACS3 communication loop between the
IFB board ACS3 connector and the EVB board has been
interrupted for 65 seconds after communication had initially
been established . This generally indicates a physical break in
the communication current loop wiring between the IFB board
and the EVB board, lack of power to the EVB board or a defect
in the EVB board .
ACS1Err:
The ASC1 communication loop between the IFB
board ASC1 connector and the A4P and A5P boards has been
interrupted for 65 seconds after communication had initially been
established . This indicator generally suggests a physical break
or interruption somewhere in the communication current loop
wiring or possibly lack of power to both A4P and A5P .
ACS13Err:
The ASC1 and ACC3 communication loops
between the IFB board ACS1 connector and the A4P and
A5P boards and between the IFB board ACS3 connector and
the EVB board have been interrupted for 65 seconds after
communication had initially been established . This indicates
that both of the conditions described above for ACS1Err and
ACS3Err exist .
Init3Err:
Proper communication was not established within
65 seconds of power up between the EVB board and the IFB
board ACS3 connector . Refer also to ACS3 DataRcvd below .
Init1Err:
Proper communication was not established within 65
seconds of power up between the A4P and A5P boards and the
IFB board ACS1 connector . Refer also to ACS1 DataRcvd below .
Init13Err:
Proper communication was not established within 65
seconds of power up between neither the EVB board and the
IFB board ACS3 connector nor the A4P and A5P boards and
the IFB board ACS1 connector . Refer also to ACS1 DataRcvd
and ACS3 DataRcvd below .
IFBRst:
24 VAC power to the IFB was interrupted and
then re-established causing a reset of the ACS1 and ACS3
communication loops .
MBErr:
Communication between the MicroTech III controller
and the IFB board has been interrupted for 30 seconds .
