YASKAWA U1000 - Page 372

Digital Operator Display Fault Name
Cooling fan has malfunctioned.
Cycle power to the drive.
Verify the cumulative operation time of the fan and the fan maintenance timer using monitors U4-03, and
U4-04.
Replace damaged cooling fans and cooling fans that have exceeded expected performance life. Refer to
Drive Cooling Fans on page 423.
Fault detected in the internal cooling fan to the
power supply.
Cycle power to the drive.
If the fault still occurs, replace the control circuit board or the entire unit. For instructions on replacing
the power board, contact the Yaskawa sales office directly or your nearest Yaskawa representative.
Digital Operator Display Fault Name
FbH
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.
Cause Possible Solution
Parameters are set inappropriately Check b5-36 and b5-37 settings.
Incorrect PID 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.
Digital Operator Display Fault Name
FbL
PID Feedback Loss
PID feedback loss detection is programmed to trigger a fault (b5-12 = 2 or 5) and the PID 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 PID 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.
Digital Operator Display 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.
Digital Operator 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.
6.4 Fault Detection
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YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual