Alarm Detection - YASKAWA L1000A Technical Manual

6.4

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 as 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-
alarms. Refer to Minor Faults and Alarms on page 254
Note: If a multi-function output is set to close when an alarm occurs (H2-
reached, triggering alarms LT-1 through LT-4 (triggered only if H2-
Digital Operator Display
AEr
Cause
Station number is set outside the possible setting
range.
Digital Operator Display
bb
Cause
External baseblock signal was entered via one of the
multi-function input terminals (S3 to S8).
Digital Operator Display
boL
Cause
The proper braking resistor has not been installed.
Digital Operator Display
bUS
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.
Digital Operator Display
CALL
Cause
Communications wiring is faulty, there is a short
circuit, or something is not connected properly.
Programming error on the master side.
Communications circuitry is damaged.
Termination resistor setting is incorrect.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Table 6.9 Alarm Codes, Causes, and Possible Solutions
Communication Option Node ID Setting Error (CANopen)
Option card node address is outside the acceptable setting range.
Set parameter F6-35 to the proper value if a CANopen option card is used.
Baseblock
Drive output interrupted as indicated by an external baseblock signal.
Check external sequence and baseblock signal input timing.
Braking Transistor Overload
The braking transistor in the drive has been overloaded.
Select the optimal braking resistor.
Option Communication Error
• After initial communication was established, the connection was lost.
• Assign a Up/Down command or speed 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.
Serial Communication Stand By
Communication has not yet been established.
• Check for wiring errors.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as needed.
Check communications at start-up and correct programming errors.
• 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, contact
Yaskawa or your nearest sales representative.
A termination resistor must be installed at both ends of a communication line. Slave drives must have the internal termination resistor
switch set correctly. Place DIP switch S2 to the ON position.
= 10), that output terminal will be triggered for certain
for information on alarm that trigger an alarm output.
= 10), it will also close when maintenance periods are
= 2F).
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
6.4 Alarm Detection
269
6