90
Diagnostics and Troubleshooting
Fault detection codes that can be reset with the automatic restart function, after the
cause has disappeared (continued)
Code Name Possible causes Remedy
PHF Input phase loss • Drive incorrectly supplied or a fuse
blown
• Failure of one phase
• 3-phase ER12 used on a single-
phase line supply
• Unbalanced load
• This protection only operates with
the drive on load
• Check the power connection and the fuses.
• Use a 3-phase line supply.
• Disable the fault by setting Input Phase loss detection
IPL page 80
= nO.
SCF5 Load short circuit • Short-circuit at drive output
• Short circuit detection at the run
order or DC injection order if
parameter IGBT test Strt page 81
is set to YES
• Check the cables connecting the drive to the motor, and
the motor’s insulation
SLF1 Modbus
communication
• Interruption in communication on
the Modbus network
• Check the connections of communication bus.
• Check the time-out (Modbus time out ttO parameter page
83
)
• Refer to the Modbus user manual
SLF2 Software
communication
• Fault communicating with
Software
• Check the Software connecting cable.
• Check the time-out
SLF3 HMI communication • Fault communicating with the
external display terminal
• Check the terminal connection
ULF Process underload
fault
• Process underload
• Motor current below the
Application Underload threshold
LUL parameter page 53
during a
period set by Application
underload time delay ULt
parameter page 53
to protect the
application.
• Check the process and the parameters of the drive to be
in phase
tJF IGBT overheat • Drive overheated
• IGBT internal temperature is too
high according to ambient
temperature and load
• Check the size of the load/motor/drive.
• Reduce the Switching frequency SFr page 57
.
• Wait for the drive to cool before restarting
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