Yaskawa AC Drive P1000 Bypass Technical Manual - Manual (Page 182)

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
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 D074 to D273 and B052 to B302.
Cause Possible Solution
Motor insulation is damaged
• Check the insulation resistance of the motor.
• Replace the motor.
A damaged motor cable is creating a short circuit
• Check the motor cable.
• Remove the short circuit and reapply power to the drive
• Check the resistance between the cable and the ground terminal .
• Replace the cable.
Excessive leakage current at the drive output
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
The drive started to run during a current offset fault
or while coasting to a stop
Set b3-01 to 1 to enable Speed Search at Start.
Hardware problem
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
6.4 Fault Detection
182 YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual