Alarm Detection - YASKAWA A1000 Technical Manual

6.5 Alarm Detection

6.5 Alarm Detection
 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- = 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 are
reached, triggering alarms LT-1 through LT-4 (triggered only if H2- = 2F).
Digital Operator Display
Cause
Station number is set outside the possible setting
range.
Digital Operator Display
Cause
External baseblock signal was entered via one of the
multi-function input terminals (S1 to S8).
Digital Operator Display
Cause
The proper braking resistor has not been installed.
Use a regen converter, regen unit, braking unit, or
other device to connect the +1 or +3 terminal to the -
terminal.
The braking transistor's use rate is high (i.e., the
regen converter is large or the repetition frequency is
high).
The braking transistor inside the drive is faulty.
Digital Operator Display
Cause
Connection is broken or master controller stopped
communicating.
Option card is damaged.
The option card is not properly connected to the
drive.
A data error occurred due to noise.
350
Table 6.16 Alarm Codes, Causes, and Possible Solutions
Station Address Setting Error (CC-Link, CANopen, MECHATROLINK)
AEr
Option card node address is outside the acceptable 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.
Baseblock
bb
Drive output interrupted as indicated by an external baseblock signal.
Check external sequence and baseblock signal input timing.
Braking Transistor Overload Fault
boL
The braking transistor in the drive has been overloaded.
Select the optimal braking resistor.
Set L8-55 to 0 to disable Internal Braking Transistor Protection.
• Change to a CDBR type braking unit.
• Change to a regen converter.
• Increase the deceleration time.
Replace the drive.
Option Communication Error
bUS
• After initial communication was established, the connection was lost.
• Assign a Run command frequency reference to the option card.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as needed.
If there are no problems with the wiring and the fault continues to occur, replace the option card.
• The connector pins on the option card are not properly lined up with the connector pins on the drive.
• Reinstall the option card.
• 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.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Minor Fault
(H2- = 10)
YES
Minor Fault
(H2- = 10)
No output
Minor Fault
(H2- = 10)
YES
Minor Fault
(H2- = 10)
YES