YASKAWA Z1000U Technical Manual page 225

HOA Keypad Display
Parameter settings for b5-36 and b5-37 are
incorrect
PID feedback wiring is faulty
Feedback sensor has malfunctioned
Feedback input circuit is damaged
HOA Keypad 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
HOA Keypad Display
Fdv
Cause
A momentary power loss occurred.
An input power supply wiring terminal is loose.
The fluctuation in the voltage of the input power
supply is too large.
The built-in fuse is open.
The phase rotation direction has changed in the
input power supply.
The detected power supply frequency exceeded the
allowable value.
HOA Keypad 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
HOA Keypad Display
inTLK
Cause
BAS Interlock multi-function input is open
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
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, 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.
Power Supply Frequency Fault
The input power supply frequency exceeded the allowable frequency fluctuation.
Reset the fault.
Check for loose terminals.
Increase the Power Supply Frequency Fault Detection Width (L2-27).
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
Correct the wiring.
Improve the power supply.
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 and C1-02).
• 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.
Interlock Open
ALM LED will not blink
Check the cause of interlock.
Minor Fault Name
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
6.5 Alarm Detection
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