Digital Operator Display Minor Fault Name
Load is too heavy Reduce the load.
Acceleration and deceleration times are set
too short.
Increase the acceleration and deceleration times (C1-01 through C1-08).
The load is locked up. Check the machine.
Parameter settings are inappropriate.
Check the settings of parameters F1-10 and F1-11
.
Incorrect speed feedback scaling when
using terminal RP as speed feedback input
in V/f Control.
• Set H6-02 to value of the speed feedback signal frequency when the motor runs at the maximum speed.
• Adjust the speed feedback signal using parameters H6-03 through H6-05.
• Make sure the speed feedback signal frequency does not exceed the maximum input frequency of terminal
RP.
The motor brake engaged. Ensure the brake releases properly.
Digital Operator Display Minor Fault Name
dFAn
Abnormal Diode Module Fan
Displays when diode converter module(s) has a fan alarm
Cause Possible Solution
Diode module cooling fan has malfunctioned
• Cycle power to the drive. • Check for fan operation..
• 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 Minor Fault Name
dnE Drive Disabled
Cause Possible Solutions
“Drive Enable” is set to a multi-function
contact input (H1-oo = 6A) and that
signal was switched off.
Check the operation sequence.
Digital Operator Display Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for longer than 0.5 s.
Cause Possible Solutions
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
Digital Operator Display Minor Fault Name
EFAn
Abnormal Panel Fan
Displays when the Panel Fan Control detects a fan Alarm
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.
Digital Operator Display Minor Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause Possible Solutions
An external fault was received from the
PLC with F6-03 set to 3, which allows the
drive to continue running after an external
fault occurs.
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
There is a problem with the PLC program. Check the PLC program and correct problems.
2.5 Alarm Detection
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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Troubleshooting
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