Yaskawa Modbus TCP/IP SI-EM3D - Manual (Page 44)

n Minor Faults and Alarms
Digital Operator Display Minor Fault Name
CALL
Serial Communication Transmission Error
Communication has not yet been established.
Cause Possible Solutions
Minor Fault
(H2-oo = 10)
Communications wiring is faulty,
there is a short circuit, the wiring
is incorrect, or the connections are
poor.
• Check for wiring errors.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as
needed.
YES
Programming error on the master
side.
Check communications at start-up and correct programming
errors.
Communications circuitry is
damaged.
• Perform a self-diagnostics check.
• If the problem continues, replace the control board or the
entire drive. Contact Yaskawa for instructions on replacing
the control board.
Termination resistor setting is
incorrect.
Install a termination resistor at both ends of a communication
line. Set the internal termination resistor switch correctly on
slave drives. Place DIP switch S1 to the ON position.
n 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 not affect standard
default drive behavior.
Setting F6-14 = 1 (Enabled) AND F6-01
≠ 3 (Fault) will cause the following operation: The
bUS fault occurs after the F7-16 delay 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 EtherNet/IP network.
Note: The option will only read parameter 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 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 parameter F7-16 from the drive during power-up.
10 Troubleshooting
44 YASKAWA TOEP YAICOM 18A 1000-Series Option Dual-Port Modbus TCP/IP SI-EM3D Installation Manual