6.5 Alarm DetectionYASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual 319Troubleshooting66.5 Alarm Detection◆ Alarm Codes, Causes, and Possible SolutionsAlarms are drive protection functions that do not necessarily cause the drive to stop. Once the cause of an alarm isremoved, the drive will return to the same status is was before the alarm occurred.When an alarm has been triggered, the ALM light on the digital operator display blinks and the alarm code displayflashes. If a multi-function output is set for an alarm (H2- = 10), that output terminal will be triggered.Note: If a multi-function output is set to close when an alarm occurs (H2- = 10), it will also close when maintenance periods arereached, triggering alarms LT-1 through LT-4 (triggered only if H2- = 2F).Table 6.16 Alarm Codes, Causes, and Possible SolutionsDigital Operator Display Minor Fault NameAEr Communication Option Station Number Setting Error (CC-Link, CANopen, MECHATROLINK-II)Option card node address is outside the acceptable setting range.Cause Possible SolutionsStation number is set outside the possible settingrange.• Set parameter F6-10 to the proper value if a CC-Link option card is used.• Set parameter F6-35 to the proper value if a CANopen option card is used.Digital Operator Display Minor Fault Namebb BaseblockDrive output interrupted as indicated by an external baseblock signal.Cause Possible SolutionsExternal baseblock signal was entered via one of themulti-function input terminals (S1 to S8). Check external sequence and baseblock signal input timing.Digital Operator Display Minor Fault NameboL Braking Transistor Overload FaultThe braking transistor in the drive has been overloaded.Cause Possible SolutionsThe proper braking resistor has not been installed. Select the optimal braking resistor.Digital Operator Display Minor Fault NamebUSOption Communication Error• After initial communication was established, the connection was lost.• Assign a Run command frequency reference to the option card.Cause Possible SolutionsConnection is broken or master controller stoppedcommunicating.• Check for faulty wiring.• Correct the wiring.• Check for disconnected cables and short circuits. Repair as needed.Option card is damaged. If there are no problems with the wiring and the fault continues to occur, replace the option card.The option card is not properly connected to thedrive.• The connector pins on the option card are not properly lined up with the connector pins on the drive.• Reinstall the option card.A data error occurred due to noise.• Check options available to minimize the effects of noise.• Take steps to counteract noise in the control circuit wiring, main circuit lines and ground wiring.• Try to reduce noise on the controller side.• Use surge absorbers on magnetic contactors or other equipment causing the disturbance.• Use recommended cables or some other type of shielded line. Ground the shield to the controller side or on the input power side.• All wiring for comm. devices should be separated from drive input power lines. Install an EMC noise filter to the drive input power.Digital Operator Display Minor Fault NameCALL Serial Communication Transmission ErrorCommunication has not yet been established.Cause Possible SolutionsCommunications wiring is faulty, there is a shortcircuit, or something is not connected properly.• Check for wiring errors.• Correct the wiring.• Check for disconnected cables and short circuits. Repair as needed.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 either the control board or the entire drive. For instructions on replacing the control board, contactYaskawa or your nearest sales representative.Termination resistor setting is incorrect. A termination resistor must be installed at both ends of a communication line. Slave drives must have the internal termination resistorswitch set correctly. Place DIP switch S2 to the ON position.
