YASKAWA Z1000U Technical Manual page 211

HOA Keypad Display
Communication Error timeout time not set
properly.
Controller is not sending data soon enough to stop
the timeout.
HOA Keypad Display
FB15
Cause
Bypass Mode current unbalance condition
exceeded the unbalance level limit set by Z1-50 for
the amount of time specified in Z1-51.
HOA Keypad Display
FB16
Cause
Incorrect phase rotation while Z1-52 is set to 2 in
Bypass Mode.
HOA Keypad Display
FbH
Cause
Parameters are set inappropriately
Incorrect PID feedback wiring
There is a problem with the feedback sensor
HOA Keypad Display
FbL
Cause
Parameters are set inappropriately
Incorrect PID feedback wiring
There is a problem with the feedback sensor
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.
HOA Keypad Display
GF
Cause
Motor insulation is damaged
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Verify the setting of the serial communications fault time (Z3-06) is set properly.
Verify the scan rate in the controller that is communicating with the bypass controller is proper. Adjust
as necessary.
Input Phase Loss
• Check input wiring including fuses, breakers, and connections upstream from the bypass.
• Check the motor wiring and connections.
Input Phase Rotation
Check the sequence (phase rotation) of the input wiring to the bypass package.
Excessive PID Feedback
PID feedback input is greater than the level set to b5-36 for longer than the time set to b5-37. Set
b5-12 to 2 or 5 to enable fault detection.
Check b5-36 and b5-37 settings.
Correct the wiring.
• Check the sensor on the control side.
• Replace the sensor if damaged.
PID Feedback Loss
This fault occurs when PID feedback loss detection is programmed to trigger a fault (b5-12 = 2) and
the PID feedback level is below the detection level set to b5-13 for longer than the time set to b5-14.
Check b5-13 and b5-14 settings.
Correct the wiring.
• Check the sensor on the control side.
• Replace the sensor if damaged.
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.
Ground Fault
• A current short to ground exceeded 50% of rated current on the output side of the drive.
• Setting L8-09 to 1 enables ground fault detection.
• Check the insulation resistance of the motor.
• Replace the motor.
Fault Name
Fault Name
Possible Solutions
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
6
211