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8-12
Name Description
LED
monitor
displays
Alarm
output
[30A/B/C]
Overload
protection
Stops the inverter output if the Insulated Gate Bipolar
Transistor (IGBT) internal temperature calculated from the
output current and temperature of inside the inverter is over the
preset value.
0lu
Yes
External alarm
input
Places the inverter in alarm-stop state upon receiving digital
input signal
THR
.
0h2
Yes
Electronic
thermal
overload
In the following cases, the inverter stops running the motor to
protect the motor in accordance with the electronic thermal
overload protection setting.
- Protects general-purpose motors over the entire frequency
range (F10 = 1.)
- Protects inverter motors over the entire frequency range
(F10 = 2.)
The operation level and thermal time constant can be set by
F11 and F12.
For motor 2, read F10 to F12 as A06 to A08.
0l1
0l2
Yes
A PTC thermistor input stops the inverter output for motor
protection.
PTC
thermistor
Connect a PTC thermistor between terminals [C1] and [11] and
set the function codes and slide switch on the interface PCB
accordingly.
0h4
Yes
Motor pr
otectio
n
Overload
early
warning
Outputs a preliminary alarm at a preset level before the
inverter is stopped by the electronic thermal overload
protection for the motor.
—
—
Operates when instantaneous overcurrent limiting is active.
Stall prevention
Instantaneous overcurrent limiting:
Operates if the inverter's output current exceeds the
instantaneous overcurrent limit level, avoiding tripping of the
inverter (during constant speed operation or during
acceleration).
— —
Alarm relay
output
(for any fault)
The inverter outputs a relay contact signal when the inverter
issues an alarm and stops the inverter output.
< Alarm reset >
The alarm stop state is reset by pressing the
key or by the
digital input signal
RST
.
< Saving the alarm history and detailed data >
The information on the previous 4 alarms can be saved and
displayed.
— Yes
Memory error
detection
The inverter checks memory data after power-on and when the
data is written. If a memory error is detected, the inverter stops.
er1
Yes
Keypad
communications
error detection
The inverter stops by detecting a communications error
between the inverter and the keypad during operation using
the standard keypad or the multi-function keypad (optional).
er2
Yes
CPU error
detection
If the inverter detects a CPU error or LSI error caused by noise
or some other factors, this function stops the inverter.
er3
Yes
"—": Not applicable.