YASKAWA Z1000 User Manual page 219

Digital Operator Display
FbH
Cause
Parameter 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
Parameter 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
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.
Digital Operator Display
LT-2
Cause
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual
Excessive PID Feedback
The PID feedback input is higher than the level set to b5-36 for longer than the time set to 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 to b5-13 for longer than the time set to b5-14.
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.
Current Alarm
Drive current exceeded overcurrent warning level (150% of the rated current).
Reduce the load for applications with repetitive operations (i.e., stops and starts), 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 C1-04).
• 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 only appear 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: The signal closes when the maintenance period ends if H2-oo = 2F. The signal will not close
if H2-oo = 10.
Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
Capacitor Maintenance Time
The main circuit and control circuit capacitors are nearing the end of their expected performance life.
Note: The signal closes when the maintenance period ends if H2-oo = 2F. The signal will not close
if H2-oo = 10.
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
5.5 Alarm Detection
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