HOA Keypad Display
Minor Fault Name
FbL
PI Feedback Loss
The PI feedback input is lower than the level set to b5-13 for longer than the time set to b5-14, and
b5-12 is set to 1 or 4.
Cause
Possible Solutions
Parameter settings for b5-13 and b5-14 are
incorrect
Check parameters b5-13 and b5-14.
PI feedback wiring is faulty
Correct the wiring.
Feedback sensor has malfunctioned
Check the sensor and replace it if damaged.
Feedback input circuit is damaged
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
HOA Keypad Display
Minor Fault Name
HCA
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Cause
Possible Solutions
Load is too heavy
Reduce the load for applications with repetitive operations (i.e., stops and starts), or replace the drive.
Acceleration and deceleration times are too short
• 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 to C1-04).
• Increase the capacity of the drive.
A special-purpose motor is being used, or the drive
is attempting to run a motor greater than the
maximum allowable capacity
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the allowable capacity range.
The current level increased due to Speed Search
after a momentary power loss or while attempting
to perform a fault restart
The alarm will only appear briefly. There is no need to take action to prevent the alarm from occurring
in such instances.
HOA Keypad Display
Minor Fault Name
inTLK
Interlock Open
ALM LED will not blink
Cause
Possible Solutions
BAS Interlock multi-function input is open
Check the cause of interlock.
HOA Keypad Display
Minor Fault Name
LT-1
Cooling Fan Maintenance Time
The cooling fan has reached its expected maintenance period and may need to be replaced.
Cause
Possible Solutions
The cooling fan has reached 90% of its expected
performance life
Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
HOA Keypad Display
Minor Fault Name
LT-2
Capacitor Maintenance Time
The main circuit and control circuit capacitors are nearing the end of their expected performance life.
Cause
Possible Solutions
The main circuit and control circuit capacitors have
reached 90% of their expected performance lives
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
HOA Keypad Display
Minor Fault Name
LT-3
Soft Charge Bypass Relay Maintenance Time
The DC bus soft charge relay is nearing the end of its expected performance life.
Cause
Possible Solutions
The DC bus soft charge relay has reached 90% of
expected performance life
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
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6
Diagnostics & Troubleshooting
