0411 IH-2957
PAGE 11 OF 17
fREQUENCY DRIVE CONTINUED
CODE
NAME
POSSIBLE CAUSES
REMEDY
PHF
Input phase loss
• Drive incorrectly supplied or a fuse blown
• Failure of one phase
• 3-phase ATV12 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
=
nO
SCF 5
Load short circuit
• Short circuit at drive output
• Short circuit detection at the run order or DC
injection order if parameter IGBT test
Strt
is set
to
YES
• Check the cables connecting the drive to the
motor, and the motor’s insulation
SLF 1
Modbus
communication
• Interruption in communication on the Modbus
network
• Check the connections of communication bus
• Check the time-out (Modbus time out
ttO
parameter)
• Refer to the Modbus user manual
SLF 2
SoMove
communication
• Fault communicating with SoMove
• Check the SoMove connection cable
• Check the time-out
SLF 3
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 during a perid set
by application underload time delay
ULt
parameter 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
• Wait for the drive to cool before restarting
