4-49
4-2 Function Mode
4
Functions
Thermal Warning
•This function outputs an alarm signal before electronic thermal overheat protection is activated.
The warning level can be set in C061.
•Allocate 13 (THM) to any of multi-function output terminals P1 to P5 (C021 to C025) or the relay
output terminal (C026).
Overload Limit/Overload Warning
This function helps prevent an overcurrent trip due to rapid load fluctuation in acceleration or
constant speed operation.
Overload Limit
•The Inverter monitors the motor current during acceleration or constant speed operation in order
to lower output frequency automatically according to the overload limit parameter once the motor
current reaches the overload limit.
•This function prevents an overcurrent trip caused by excessive moment of inertia during
acceleration, or caused by rapid load fluctuations during constant speed operation.
•You can set two types of overload limit functions in b021/b022/b023 and b024/b025/b026.
•To switch between b021/b022/b023 and b024/b025/b026, allocate 39 (OLR) to a multi-function
input and then turn it on/off.
•The overload limit level sets a current value for this function to work.
•The overload limit parameter sets a time of deceleration from the maximum frequency to 0 Hz.
•When this function operates, the acceleration time becomes longer than the set time.
Parameter No. Function name Data Default setting Unit
b021 Overload limit selection 00: Disabled
01: Enabled in acceleration/constant
speed operation
02: Enabled in constant speed operation
03: Enabled in acceleration/constant
speed operation (accelerates during
regeneration)
01
b024 Overload limit selection 2 01
b022 Overload limit level
0.20 × Rated current to 2.00 × Rated
current (0.4 to 55 kW)
0.20 × Rated current to 1.80 × Rated
current (75 to 132 kW)
1.50 × Rated
current
A
b025 Overload limit level 2
1.50 × Rated
current
A
b023 Overload limit parameter
0.1 to 30.00
1.0 s
b026 Overload limit parameter 2 1.0 s
C040
Overload warning signal
output mode
00: Enabled during acceleration/
deceleration/constant speed
01: Enabled only during constant speed
01
C041 Overload warning level 0.0: Does not operate.
0.1 × Rated current to 2.00 × Rated current
(0.4 to 55 kW)
0.1 × Rated current to 1.80 × Rated current
(75 to 132 kW)
(Outputs OL and OL2 signals when
reaching the overload warning level.)
Rated current
A
C111 Overload warning level 2 Rated current
Related functions C001 to C008, C021 to C025, C026
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