Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 255)

HOA Keypad Display Minor Fault Name
FbL
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.
Cause Possible Solutions
Parameter settings for b5-13 and b5-14 are
incorrect
Check parameters b5-13 and b5-14.
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.
HOA Keypad Display Minor Fault Name
Fdv
Power Supply Frequency Fault
The input power supply frequency exceeded the allowable frequency fluctuation.
Cause Possible Solution
A momentary power loss occurred. Reset the fault.
An input power supply wiring terminal is loose. Check for loose terminals.
The fluctuation in the voltage of the input power
supply is too large.
Increase the Power Supply Frequency Fault Detection Width (L2-27).
The built-in fuse is open.
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
The phase rotation direction has changed in the
input power supply.
Correct the wiring.
The detected power supply frequency exceeded the
allowable value.
Improve the power supply.
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 and C1-02).
• 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.
Note: An alarm output (H2-oo = 10) will only be triggered if both (H2-oo = 2F
and H2-oo = 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.
6.5 Alarm Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 255
6
Diagnostics & Troubleshooting