104
"B" Group: Fine Tuning Functions Section 3-6
• Constant Torque (b013=01)
• Free setting (b013=02)
Electronic Thermal Warning Output: You can configure this function so that
the inverter outputs a warning signal before the electronic thermal protection
operates against motor overheat. You can also set the threshold level to out-
put a warning signal with the electronic thermal warning level setting in func-
tion "C061".
To output the warning signal, assign parameter "13" (THM) to one of the intel-
ligent output terminals [11] to [12] (C021 to C022), or to the relay output termi-
nal (C026).
3-6-4 Current limitation Related Functions
Overload Restriction: B022 If
the inverter's output current
exceeds a preset current level
you specify during acceleration
or constant speed, the overload
restriction feature automatically
reduces the output frequency
during powering drive (and can
increase the speed during
regeneration) to restrict the over-
load. This feature does not gen-
erate an alarm or trip event. You
can instruct the inverter to apply
overload restriction only during
constant speed, thus allowing
higher currents for acceleration.
Or, you may use the same
threshold for both acceleration and constant speed.
You can specify two types of overload restriction operation by setting func-
tional items B021, B022, B023, and B024, B025, B026 separately. To switch
8.72
(109%)
12.0
(150%)
16.0[A]
(200%)
Trip time
[s]
60Hz (Reduction rate: x1.0)
Motor current [A]
7.0
(87.2%)
9.6
(120%)
12.8[A]
(160%)
Trip time
[s]
3Hz (Reduction rate: x0.8)
Motor current [A]
Example: MX2-AB015**, Base FQ=60Hz, HD setting (Rated current 8.0A= b012)
Reduction rate
Output frequency [Hz]
x1.0
x0.8
3
60
0
0
60
0.5
0
60
0.5
Output current [A]
Output frequency [Hz]
b019
0
Reduction rate
x1.0
x0.8
3
400
0
Setting range
A004 Max. FQ
b017b015
b020
b018
b016
Output frequency [Hz]
Motor
current
Restriction area
B022
0
t
Output
frequency
0
t
B023
Regenerating
Powering
B023
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