(.
2-11 Protection Function
Protection function
Explanation
Monitor
display
Fault con-
tact output
Low
voltage
protection
Main
circuit
voltage
low
When the inverter power voltage drops, torque be-
comes insufficient and motor is overheated. Inverter
output is stopped when the main circuit DC voltage
becomes lower than the low voltage detection level
for 15 ms or longer.
Detection level: approximately 210 V or less
(3-phase)
approximately 170 V or less
(single-phase)
(UV1)
Operation
Overcurrent
protection
The inverter output is shut-off when the inverter out-
put current becomes approx. 200% and above of in-
verter rated current.
(OC)
Operation
Ground-fault
protection
The inverter output is shut-off when a ground-fault
occurs at the inverter output side.
(GF)
Operation
Overvoltage
protection
The inverter output is shut-off when the main circuit
DC voltage becomes excessive because of regener-
ation energy caused by motor deceleration and neg-
ative load.
Detection level: approx. 410 V or more
(OV)
Operation
Fuse blown
The inverter output is shut-off when the main circuit
transistor fails.
The fuse clears to prevent wiring from being dam-
aged by the short-circuit current.
(Not displayed)
Cooling fin overheat
The inverter output is shut-off when the ambient tem-
perature rises and the heat sink fin reaches 90
C.
Please check for a defective cooling fan or clogged
filter.
(OH)
Operation
Overload
protection
Motor
Inverter output is stopped when motor overload is
detected by the electronic thermal overload in the
inverter. Either a inverter duty constant-torque spe-
cialized motor or general-purpose motor can be se-
lected. If more than one motor is drive, overload pro-
tection should be disabled. Use a thermal relay or
thermal protector for each motor.
(OL1)
Operation
Inverter
The inverter output is shut-off when electronic ther-
mal overload reaches or exceeds the inverse time
limit of 112% of the inverter’s rated current occurs.
Maximum rated overload: 150%, 1 min.
(OL2)
Operation
Over
torque
detection
The motor operates according to a preset mode
when the inverter output current exceeds the overtor-
que detection level. This function is used to protect
the machine or to monitor the output torque.
(OL3)
Operation
External fault signal
input
When an external alarm signal is input, the inverter
operates according to a preset stop method (coasting
to a stop, or ramp to stop)
(EF3)
Operation
Control circuit fault
thermistor fault
The inverter output is shut-off when a transmission
error occurs in the control circuit or a component
fails.
to
*
(see note)
Operation
Note
* indicates the content of digital operator display
#
Section 2-11
Summary of Contents for SYSDRIVE 3G3SV
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