Yaskawa APOGEE FLN P1 - Manual (Page 46)

11 Troubleshooting
u Drive-Side Error Codes
Drive-side error codes appear on the drive digital operator. Causes of the errors and corrective
actions are listed below. Refer to the drive manual for additional error codes that may appear
on the drive digital operator.
n Faults
Both BUS (SI-J3 option communication error) and EF0 (External fault input from the SI-J3
option) can appear as an alarm or as a fault. The digital operator ALM LED remains lit when
a fault occurs. The ALM LED flashes when an alarm occurs.
Use the following questions as a guide to help remedy the fault if communication stops while
the drive is running:
• Is the option properly installed?
• Are the communication lines properly connected to the option? Are the wires loose?
• Is the controller program working? Has the controller/PLC CPU stopped?
• Did a momentary power loss interrupt communications?
Digital Operator Display Fault Name
bUS
Option Communication Error
• The connection was lost after establishing initial communication.
• Only detected when the run command frequency reference is assigned to an
option card.
Cause Possible Solution
No signal was received from the
PLC
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
Faulty communications wiring or
an existing short circuit
Communication data error
occurred due to electrical
interference
• Check the various options available to minimize the effects of noise.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• Ensure that other equipment such as switches or relays do not cause electrical
inteference. Use surge absorbers if necessary.
• Use only recommended cables or other shielded line. Ground the shield on the
controller side or the drive input power side.
• Separate all communication wiring from drive power lines. Install an EMC
noise filter to the drive power supply input.
Communication timed out
• No network communications were received within the time set in parameter
F6-77. Increase the setting of F6-77 or disable the fault using parameter F6-76.
The option card is damaged
Replace the option card if there are no problems with the wiring and the error
continues to occur.
11 Troubleshooting
46 YASKAWA TOEP YAICOM 13 Metasys N2 & Apogee FLN P1 SI-J3 Installation & Technical Manual