Yaskawa AC Drive Z1000 Bypass Technical Manual - Manual (Page 230)

Communication Error timeout time not set
properly.
Verify the setting of the serial communications fault time (Z3-06) is set properly.
Controller is not sending data soon enough to stop
the timeout.
Verify the scan rate in the controller that is communicating with the bypass controller is proper. Adjust
as necessary.
HOA Keypad Display Fault Name
FB15 <1> Input Phase Loss
Cause Possible Solutions
Bypass Mode current unbalance condition
exceeded the unbalance level limit set by Z1-50 for
the amount of time specified in Z1-51.
• Check input wiring including fuses, breakers, and connections upstream from the bypass.
• Check the motor wiring and connections.
<1> Available in bypass controller software versions VST800298 and later.
HOA Keypad Display Fault Name
FB16 <1> Input Phase Rotation
Cause Possible Solution
Incorrect phase rotation while Z1-52 is set to 2 in
Bypass Mode.
Check the sequence (phase rotation) of the input wiring to the bypass package.
<1> Available in bypass controller software versions VST800298 and later.
HOA Keypad Display Fault Name
Fn1
External Fan Fault
External fan failure
Cause Possible Solution
External cooling fan has malfunctioned
• Cycle power to the drive.
• Check for fan operation.
• Verify the cumulative operation time of the fan with monitor U4-03, and verify the cumulative
operation time of the fan maintenance timer with U4-04.
• If the cooling fan has exceeded its expected performance life or is damaged in any other way, follow
the replacement instructions in the Periodic Inspection & Maintenance chapter.
HOA Keypad Display Fault Name
FbH
Excessive PI Feedback
PI 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.
Cause Possible Solution
Parameters are set inappropriately Check b5-36 and b5-37 settings.
Incorrect PI feedback wiring Correct the wiring.
There is a problem with the feedback sensor
• Check the sensor on the control side.
• Replace the sensor if damaged.
HOA Keypad Display Fault Name
FbL
PI Feedback Loss
This fault occurs when PI feedback loss detection is programmed to trigger a fault (b5-12 = 2) and
the PI feedback level is below the detection level set to b5-13 for longer than the time set to b5-14.
Cause Possible Solution
Parameters are set inappropriately Check b5-13 and b5-14 settings.
Incorrect PI feedback wiring Correct the wiring.
There is a problem with the feedback sensor
• Check the sensor on the control side.
• Replace the sensor if damaged.
HOA Keypad Display Fault Name
GF
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 in models Z1B1D074 to D273 and B052 to B302.
Cause Possible Solution
6.4 Fault Detection
230 YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual