Communication errors, Bus fault tolerance – Yaskawa BACnet MS/TP SI-B3/V User Manual
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Communication Errors
Errors that may occur when accessing drive parameters using the BACnet objects are shown
.
Table 8 MEMOBUS to BACnet Error Conversion
Error Code
Description
03d
BN_ERR_DEVICE_IS_BUSY
Writing to a parameter was attempted while the drive was saving parameters to non-volatile
memory.
27d
BN_ERR_READ_ACCESS_DENIED
Invalid parameter register number used when reading.
37d
BN_ERR_VALUE_OUT_OF_RANGE
Value written to the parameter is out of the valid range.
40d
BN_ERR_WRITE_ACCESS_DENIED
An invalid parameter register number was used when writing.
Writing to a parameter was attempted while the drive was in a mode that disables writing (i.e.,
writing while the drive was Auto-Tuning).
Writing to a parameter was attempted while the DC Bus had an Undervoltage (Uv) fault.
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bUS Fault Tolerance
bUS Fault Auto-Restart
Parameter F6-14, bUS Fault Auto Reset Select, will appear when the option is installed.
Setting F6-14 = 0 (Disabled) or F6-01 = 3 or greater (Alarm only) will cause the drive to
declare an alarm after the time set in F6-04 has passed.
Setting F6-14 = 1 (Enabled) AND F6-01
≠ 3 (Fault) will cause the following operation: The
bUS fault occurs after the F7-16 + F6-04 delay time and the Run command is removed from
the drive. Then the option throws a bUS fault to the drive. When the condition is removed,
the option commands a fault reset and returns control of the drive to the BACnet network.
Note:
The option will only read parameters F6-01 and F6-14 from the drive during power-up.
bUS Fault Delay
Parameter F7-16, Communications Loss Detection Time Delay, will appear when the option
is installed.
The setting value of F7-16 + F6-04 is the length of time that the option will delay sending the
bUS fault to the drive.
The status LEDs on the option are not affected by the delay time set in F7-16; the LEDs will
indicate the bUS condition immediately.
Note:
The option will only read parameters F6-04 and F7-16 from the drive during power-up.
7 Troubleshooting
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YASKAWA TOEP YAICOM 19A V1000 Option BACnet MS/TP SI-B3/V Installation & Technical Manual