A
<.
550-UH User’s Manual
1-203
Embedded fieldbus
Loss of communication
The action taken by the A
YK
550, if communication is lost, is configured in
. The parameters are 3018
COMM
FAULT
FUNC
and 3019
COMM
FAULT
TIME
. The
Complete parameter descriptions
section on page
describes
these parameters.
No master station on line
If no master station is on line: Neither the
EFB
OK
MESSAGES
nor the errors (5307
EFB
CRC
ERRORS
and 5308
EFB
UART
ERRORS
) increase on any of the stations.
To correct:
•
Check that a network master is connected and properly programmed on the
network.
•
Verify that the cable is connected, and is not cut or short circuited.
Duplicate stations
If two or more stations have duplicate numbers:
•
Two or more drives cannot be addressed.
•
Every time there is a read or write to one particular station, the value for 5307
EFB
CRC
ERRORS
or 5308
EFB
UART
ERRORS
advances.
To correct: Check all station numbers and edit conflicting values.
Swapped wires
If the communication wires are swapped (terminal A on one drive is connected to
terminal B on another):
•
The value of 5306
EFB
OK
MESSAGES
does not advance.
•
The values of 5307
EFB
CRC
ERRORS
and 5308
EFB
UART
ERRORS
are advancing.
To correct: Check that the EIA-485 lines are not swapped.
Fault 28 – Serial 1 Err
If the drive’s control panel shows fault code 28 “
SERIAL
1
ERR
”, check for either of the
following:
•
The master system is down. To correct, resolve problem with master system.
•
The communication connection is bad. To correct, check communication
connection at the drive.
•
The time-out selection for the drive is too short for the given installation. The
master is not polling the drive within the specified time-out delay. To correct,
increase the time set by parameter 3019
COMM
FAULT
TIME
.
Fault 31 – EFB1
For BACnet: If the drive’s control panel shows fault code 31 “
EFB
1”, the drive has an
invalid Device Object Instance ID. To correct, use parameters 5311 and 5317 and
establish a unique drive ID that is in the range 1 to 4,194,303.
Содержание Johnson Controls AYK550-UH
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