YASKAWA P1000 Technical Manual page 196

6.4 Fault Detection
HOA Keypad Display
Communication Error timeout time not set
properly.
Controller is not sending data soon enough to stop
the timeout.
HOA Keypad Display
<1>
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.
<1> Available in bypass controller software versions VST800298 and later.
HOA Keypad Display
<1>
FB16
Cause
Incorrect phase rotation while Z1-52 is set to 2 in
Bypass Mode.
<1> Available in bypass controller software versions VST800298 and later.
HOA Keypad Display
Fn1
Cause
External cooling fan has malfunctioned
HOA Keypad Display
FbH
Cause
Parameters are set inappropriately
Incorrect PI feedback wiring
There is a problem with the feedback sensor
HOA Keypad Display
FbL
Cause
Parameters are set inappropriately
Incorrect PI feedback wiring
There is a problem with the feedback sensor
HOA Keypad Display
GF
Cause
196
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.
External Fan Fault
External fan failure
• 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
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.
Check b5-36 and b5-37 settings.
Correct the wiring.
• Check the sensor on the control side.
• Replace the sensor if damaged.
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.
Check b5-13 and b5-14 settings.
Correct the wiring.
• Check the sensor on the control side.
• Replace the sensor if damaged.
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 D074 to D273 and B052 to B302.
YASKAWA SIEP YAIP1B 01B YASKAWA AC Drive – P1000 Bypass Technical Manual
Fault Name
Fault Name
Possible Solutions
Fault Name
Possible Solution
Fault Name
Possible Solution
Periodic Inspection & Maintenance
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
chapter.