5.3 Alarm Detectionu Alarm Codes, Causes, and Possible SolutionsAlarms are drive protection functions that do not necessarily cause the drive to stop. After removing the cause of an alarm,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 display flashes. Ifa multi-function output is set for an alarm (H2-oo = 10), that output terminal will be triggered.Note: If a multi-function output is set to close when an alarm occurs (H2-oo = 10), it will also close when maintenance periods are reached,triggering alarms LT-1 through LT-4 (triggered only if H2-oo = 2F).Table 5.3 Alarm Codes, Causes, and Possible SolutionsDigital Operator Display Minor Fault NameAEr Station Address Setting Error (CC-Link, CANopen, MECHATROLINK)Option card node address is outside of the acceptable setting range.bb BaseblockDrive output interrupted as indicated by an external baseblock signal.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 beeninstalled. Select the proper braking resistor.Use a regen converter, regen unit, brakingunit, or other device to connect the +1 or +3terminal to the - terminal. Set L8-55 to 0 to disable Internal Braking Transistor Protection.The use rate of the braking transistor is high(i.e., the regen converter is large or therepetition frequency is high).• Change to a CDBR type braking unit.• Change to a regen converter.• Increase the deceleration time.The braking transistor inside the drive isfaulty. Replace the drive.Digital Operator Display Minor Fault NamebUSOption Communication Error• The connection was lost after initial communication was established.• Assign a Run command frequency reference to the option.Cause Possible SolutionsConnection is broken or master controllerstopped communicating.• Check for faulty wiring.• Correct the wiring.• Check for disconnected cables and short circuits. Repair as needed.Option is damaged. If there are no problems with the wiring and the fault continues to occur, replace the option.The option is not properly connected to thedrive.• The connector pins on the option are not properly lined up with the connector pins on the drive.• Reinstall the option.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 oron the input power side.• Separate the wiring for communication devices from the drive input power lines. Install an EMC noisefilter to the drive input power.5.3 Alarm Detection196 YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
