4-31
4-2 Function Mode
4
Functions
Reduced Torque Characteristics 2
•Multiplied by the time limit characteristics set in b012/212 for each frequency.
Overload Limit/Overload Warning
This function helps prevent an overcurrent trip due to rapid load fluctuation in acceleration or
constant speed operation.
* To switch to the 2nd control, allocate 08 (SET) to the multi-function input terminal and then turn it on.
•The Inverter monitors the motor current during acceleration or constant speed operation. If it
reaches the overload limit level, the output frequency is lowered automatically according to the
overload limit parameter.
•The overload limit level sets a current value for this function to work.
•When this function operates, the acceleration time becomes longer than the set time.
Electronic thermal level
X1.0
X0.8
0
20 60
Inverter output
frequency (Hz)
(Example) 3G3JX-A2007 (Rated current: 4.0 A), b012 = 4.00 (A),
Output frequency = 40 Hz
Time before trip (s)
Motor current (A)
(Ratio to the rated current of the Inverter
60
4
0
4.16
(104%)
5.4
(135%)
7.2
(180%)
Parameter No. Function name Data Default setting Unit
b021 Overload limit selection
00: Disabled
01: Enable in acceleration/constant
speed operation
02: Enabled in constant speed
operation
01 ⎯
*
b221
2nd overload limit
selection
01 ⎯
b022 Overload limit level
0.1 × Rated current to 1.5 × Rated
current
1.5 × Rated
current
A
*
b222 2nd overload limit level
1.5 × Rated
current
A
b023 Overload limit parameter
0.1 to 3000.0
(Deceleration time while this function
is in operation)
1.0 s
*
b223
2nd overload limit
parameter
1.0 s
b028
Overload limit source
selection
00: b022, b222 set values
01: Input terminal FV
00 ⎯
*
b228
2nd overload limit source
selection
00 ⎯
C041 Overload warning level
0.0: Does not operate.
0.1 × Rated current to 2.0 × Rated
current (Outputs OL signal when the
overload warning level is reached.)
Rated current
A
*
C241 2nd overload warning level Rated current
Related functions C021, C026
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