Yaskawa Z1000 AC Drive HVAC - Manual (Page 214)

PID 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.
Digital Operator 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 through 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.
Digital Operator 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.
Note: An alarm output (H2- = 10) will only be triggered if both (H2- = 2F and
H2- = 10) are set.
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.
Digital Operator 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.
Note: An alarm output (H2- = 10) will only be triggered if H2- = 2F.
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.
Digital Operator 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.
Note: An alarm output (H2- = 10) will only be triggered if H2- = 2F.
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.
Digital Operator Display Minor Fault Name
LT-4
IGBT Maintenance Time (50%)
IGBTs have reached 50% of their expected performance life.
Note: An alarm output (H2- = 10) will only be triggered if H2- = 2F.
Cause Possible Solutions
IGBTs have reached 50% of their expected
performance life.
Check the load, carrier frequency, and output frequency.
5.5 Alarm Detection
214 YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual