Digital Operator Display
Fault Name
Motor brake is engaged
Ensure the motor brake releases properly.
Digital Operator Display
Fault Name
dFAn
Abnormal Diode Module Fan
Displays when diode converter module(s) has a fan fault
Cause
Possible Solution
Diode module 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, replace
the cooling fan.
Digital Operator Display
Fault Name
dv1
Z Pulse Fault (CLV/PM control mode only)
The motor turned one full rotation without the Z Pulse being detected.
Cause
Possible Solution
PG encoder is disconnected, improperly
wired, or the PG option card or PG encoder are
damaged
• Make sure the PG encoder is properly connected and all shielded lines are properly grounded.
• If the problem continues after cycling power, replace the PG option card or the PG encoder.
Digital Operator Display
Fault Name
dv2
Z Pulse Noise Fault Detection (CLV/PM control mode only)
The Z Pulse is out of phase by more than 5 degrees for 10 consecutive revolutions.
Cause
Possible Solution
Noise interference along the PG cable
Separate the PG cable lines from the source of the noise.
PG cable is not wired properly
Rewire the PG encoder and properly ground all shielded lines.
PG option card or the PG encoder are damaged If the problem continues after cycling power, replace the PG option card or the PG encoder.
Digital Operator Display
Fault Name
dWAL
DriveWorksEZ Fault
dWFL
Cause
Possible Solution
Fault output by DriveWorksEZ
Correct the cause of the fault.
Digital Operator Display
Fault Name
E5
MECHATROLINK Watchdog Timer Error
The watchdog timed out.
Cause
Possible Solution
Data has not been received from the PLC
Execute DISCONNECT or ALM_CLR, then issue a CONNECT command or SYNC_SET command and
proceed to phase 3. Refer to the SI-T3 Option Technical Manual for more details on troubleshooting.
Digital Operator Display
Fault Name
EFAn
Abnormal Panel Fan
Displays when the Panel Fan Control detects a fan fault
Cause
Possible Solution
Panel fan or panel fan control 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, replace
the cooling fan.
2.4 Fault Detection
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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Troubleshooting