YASKAWA A1000 Series Technical Manual page 321

EF7
EF8
Cause
An external device has tripped an alarm function.
Wiring is incorrect.
Multi-function contact inputs are set incorrectly.
Digital Operator Display
FbH
Cause
Parameters settings for b5-36 and b5-37 are
incorrect.
PID feedback wiring is faulty.
Feedback sensor has malfunctioned.
Feedback input circuit is damaged.
Digital Operator Display
FbL
Cause
Parameters settings for b5-13 and b5-14 are
incorrect.
PID feedback wiring is faulty.
Feedback sensor has malfunctioned.
Feedback input circuit is damaged.
Digital Operator Display
Hbb
Cause
Both Safe Disable Inputs H1 and H2 are open.
Internally, both Safe Disable channels are broken.
Digital Operator Display
HbbF
Cause
The signals to the Safe Disable inputs are wrong or
the wiring is incorrect.
One of the Safe Disable channels is faulty.
Digital Operator Display
HCA
Cause
Load is too heavy.
Acceleration and deceleration times are too short.
A special-purpose motor is being used, or the drive is
attempting to run a motor greater than the maximum
allowable capacity.
The current level increased due to Speed Search after
a momentary power loss or while attempting to
perform a fault restart.
Digital Operator Display
LT-1
Cause
The cooling fan has reached 90% of its expected
performance life.
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
External fault (input terminal S7)
External fault at multi-function input terminal S7.
External fault (input terminal S8)
External fault at multi-function input terminal S8.
Remove the cause of the external fault and reset the multi-function input value.
• Ensure the signal lines have been connected properly to the terminals assigned for external fault detection (H1-
• Reconnect the signal line.
• Check if the unused terminals have been set for H1-
• Change the terminal settings.
Excessive PID Feedback
The PID feedback input is higher than the level set in b5-36 for longer than the time set in b5-37, and b5-12 is set to 1 or 4.
Check parameters b5-36 and b5-37.
Correct the wiring.
Check the sensor and replace it if damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
PID Feedback Loss
The PID feedback input is lower than the level set in b5-13 for longer than the time set in b5-14, and b5-12 is set to 1 or 4.
Check parameters b5-13 and b5-14.
Correct the wiring.
Check the sensor and replace it if damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
Safe Disable Signal Input
Both Safe Disable Input channels are open.
• Check signal status at the input terminals H1 and H2.
• Check the Sink/Source Selection for the digital inputs.
• If the Safe Disable function is not utilized, check if the terminals H1-HC, and H2-HC are linked.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
Safe Disable Signal Input
One Safe Disable channel is open while the other one is closed.
Check signal status at the input terminals H1 and H2. If the Safe Disable function is not utilized, the terminals H1-HC, and H2-HC
must be linked.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Either reduce the load for applications with repetitive operation (repetitive stops and starts, etc.), or replace the drive.
• Calculate the torque required during acceleration and for the inertia moment.
• If the torque level is not right for the load, take the following steps:
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the capacity of the drive.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the allowable capacity range.
The alarm will appear only briefly. There is no need to take action to prevent the alarm from occurring in such instances.
Cooling Fan Maintenance Time
The cooling fan has reached its expected maintenance period and may need to be replaced.
Note: An alarm output (H2- = 10) will only be triggered if H2-
Replace the cooling fan and reset the Maintenance Monitor by setting o4-03 to 0.
6.5 Alarm Detection
Possible Solutions
= 20 to 2F (External Fault).
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
Minor Fault Name
= 2F.
Possible Solutions
= 20 to 2F).
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