Alpha 6000 - Page 167

Chapter6 Troubleshooting
166
Fault
display
Name of
protection
Possible reasons of fault Actions
OL2
Inverter
overload
●Inverter’s output exceed
its overloading value
●DC injection braking
current is too big
●Improper V/F curve
●Low AC supply voltage
●Too heavy load
●Too short accelerating
time
●Reduce the load, increase
accelerating time
●Reduce the DC injection
braking current, increase
braking time
●Adjust V/F curve and
torque boost
●Check the AC supply
voltage
● Select bigger capacity
inverter.
●Increase accelerating time
SC
Load
short-circuit
●Inverter’s output load is
short circuited
●The output side is short
circuit grounding
●Check resistance of the
motor’s winding
●Check the insulation of the
motor
●Check the insulation of the
motor
EF0
External fault
comes from
RS485 serial
communicatio
n
●MODBUS serial
transmission error
●Faults comes from
external control circuit
●Set correct overtime
detecting time or set
overtime detecting time of
Pb.03 to 0.0s
●Check external control
circuit
●Check input terminals, if
the fault appeared even
when the terminals aren’t
used, please, seek tech
support
EF1
External fault
on terminals
X1~X8
SP1
Input phase
failure or
Unbalance
●Input R, S, T have
phase loss or imbalance
●Check input voltage
●Check input cable
connection
SP0
Output phase
failure or
Unbalance
●Output U, V, W have
phase loss or imbalance
●Check output cable
connection
●Check the insulation of the
motor and cables