(/
Protection function
Error causes
Action to be taken
Low
voltage
protection
Main
circuit
voltage
low
Inverter capacity is too small.
Voltage drop due to wiring.
A motor of large capacity (11 kW or
greater) connected to the same power
system has been started.
Rapid acceleration with generator power
supply
Operation sequence when power is off
Defective electromagnetic contactor
Check the power capacity and power
system.
UV display appears when the inverter
power is turned off while operation signal
is input. Remove the power after stop-
ping the inverter.
(Set the third bit of constant 1 to 01.)
Overcurrent
protection
Extremely rapid accel/decel
Motor on/off switching at the inverter out-
put side
Short-circuit at the inverter output side
Motor of a capacity greater than the in-
verter rating has been started.
High-speed motor or pulse motor has
been started.
Transistor error may occur. Investigate
the error cause, correct it, then restart.
Ground-fault
protection
Ground-fault at the inverter output side
Overvoltage
protection
Over voltage
Insufficient deceleration time
Regenerative load (Motor is turned by the
load.)
High input voltage compared to motor
rated voltage
If braking torque is not proper, extend the
decel time or use a braking resistor.
Fuse blown
Repeated overcurrent protection (OC)
Repeated overload protection (OL2) pow-
er reset
Rapid deceleration in excess excitation
(improper V/f characteristic setting)
Turn off the power supply once and turn
it on again.
If the fault occurs again after replace-
ment, replace the inverter.
Cooling fin overheat
Defective cooling fan
Ambient temperature rise
Clogged filter
Replace the cooling fan and clean the
filter.
Ambient temperature: 122
F (50
C) or
less
Overload
protection
Motor
Overload, low speed operation or ex-
tended acceleration time, improper V/f
characteristic setting
Investigate the cause of overload and
review the operation pattern, V/f charac-
teristic, and motor/inverter capacities.
(If inverter is repeatedly reset after an
overload occurs the inverter may fault
Inverter
overload occurs, the inverter may fault.
Investigate and correct the cause of
overload.)
Over
torque
detection
Motor current exceeds the preset value
because of machine error or overload
Check the use of the machine. Correct
the overload cause or set a higher detec-
tion level which is within the allowable
range.
External fault signal
input
External fault condition occurred.
Correct the cause of the fault input.
Control circuit fault
thermistor fault
External noise
Excess vibration or shock
Record all data of
and
, then
make initialization.
Turn off power, then turn on again. If er-
ror is persistent, replace the inverter.
#
Section 2-11
Summary of Contents for SYSDRIVE 3G3SV
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