YASKAWA AC Drive-A1000 - Alarm Detection; Alarm Codes, Causes, and Possible Solutions

6.5 Alarm Detection
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Alarm Codes, Causes, and Possible Solutions
Alarms are drive protection functions that do not necessarily cause the drive to stop. Once the cause of an alarm is removed,
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. If
a 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 6.15 Alarm Codes, Causes, and Possible Solutions
Digital Operator Display Minor Fault Name
AEr
Communication Option Station Number Setting Error (CC-Link, CANopen, MECHATROLINK-II)
Option card node address is outside the acceptable setting range.
Cause Possible Solutions
Station number is set outside the possible
setting range.
• 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 Name
bb
Baseblock
Drive output interrupted as indicated by an external baseblock signal.
Cause Possible Solutions
External baseblock signal was entered via
one of the multi-function input terminals
(S1 to S8).
Check external sequence and baseblock signal input timing.
Digital Operator Display Minor Fault Name
boL
Braking Transistor Overload Fault
The braking transistor in the drive has been overloaded.
Cause Possible Solutions
The proper braking resistor has not been
installed.
Select the optimal braking resistor.
Digital Operator Display Minor Fault Name
bUS
Option Communication Error
• After initial communication was established, the connection was lost.
• Assign a Run command frequency reference to the option card.
Cause Possible Solutions
Connection is broken or master controller
stopped communicating.
• 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 the drive.
• 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 Name
CALL
Serial Communication Transmission Error
Communication has not yet been established.
Cause Possible Solutions
6.5 Alarm Detection
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YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual