Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Load is too heavy Reduce the load. YES
Acceleration and deceleration times are set too short. Increase the acceleration and deceleration times (C1-01 through C1-08). YES
The load is locked up. Check the machine. YES
Parameter settings are inappropriate. Check the settings of parameters F1-10 and F1-11. YES
The motor brake engaged. Ensure the brake releases properly. YES
LED Operator Display Minor Fault Name
dnE Drive Disabled
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
“Drive Enable” is set to a multi-function contact input
(H1-oo = 6A) and that signal was switched off.
Check the operation sequence. YES
LED Operator Display Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for over 0.5 s.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
YES
LED Operator Display Minor Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
An external fault was received from the PLC with F6-03
= 3 (causing the drive to continue running when an
external fault occurs).
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
YES
There is a problem with the PLC program. Check the PLC program and correct problems. YES
LED Operator Display Minor Fault Name
EF1
External fault (input terminal S1)
External fault at multi-function input terminal S1.
EF2
External fault (input terminal S2)
External fault at multi-function input terminal S2.
EF3
External fault (input terminal S3)
External fault at multi-function input terminal S3.
EF4
External fault (input terminal S4)
External fault at multi-function input terminal S4.
EF5
External fault (input terminal S5)
External fault at multi-function input terminal S5.
EF6
External fault (input terminal S6)
External fault at multi-function input terminal S6.
EF7
External fault (input terminal S7)
External fault at multi-function input terminal S7.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
An external device has tripped an alarm function. Remove the cause of the external fault and reset the multi-function input value. YES
Wiring is incorrect.
• Ensure the signal lines have been connected properly to the terminals assigned for external fault detection
(H1-oo = 20 to 2F).
• Reconnect the signal line.
YES
Multi-function contact inputs are set incorrectly.
•
Check if the unused terminals have been set for H1-oo = 20 to 2F (External Fault).
• Change the terminal settings.
YES
LED Operator Display Minor Fault Name
FbH
Excessive PID Feedback
The PID feedback input is higher than the level set in b5-36 for longer than the time set in b5-37, and b5-12 is set to 1 or 4.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Parameters settings for b5-36 and b5-37 are incorrect. Check parameters b5-36 and b5-37. YES
PID feedback wiring is faulty. Correct the wiring. YES
Feedback sensor has malfunctioned. Check the sensor and replace it if damaged. YES
Feedback input circuit is damaged. Replace the drive. YES
LED Operator Display Minor Fault Name
FbL
PID Feedback Loss
The PID feedback input is lower than the level set in b5-13 for longer than the time set in b5-14, and b5-12 is set to 1 or 4.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Parameters settings for b5-13 and b5-14 are incorrect. Check parameters b5-13 and b5-14. YES
PID feedback wiring is faulty. Correct the wiring. YES
Feedback sensor has malfunctioned. Check the sensor and replace it if damaged. YES
Feedback input circuit is damaged. Replace the drive. YES
LED Operator Display Minor Fault Name
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
239
6
Troubleshooting
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