Current Limitation Related Functions; Overload Restriction; Electronic Thermal Warning Output - Omron MX2 User Manual

"B" Group: Fine Tuning Functions
Reduction rate
x1.0
x0.8
3-6-4

Current limitation Related Functions

104
• Constant Torque (b013=01)
Example:
0 3 60
Output frequency [Hz]
• Free setting (b013=02)
Reduction rate
x1.0
x0.8
Setting range
0
3
Output frequency [Hz]
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).
Overload Restriction: B022 If
the inverter's output
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
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
MX2-AB015**, Base FQ=60Hz,
60Hz (Reduction rate: x1.0)
Trip time
[s]
60
0.5
0
8.72 12.0
(109%) (150%)
Motor current [A]
400
Motor
current
current
B022
speed during
Output
frequency
Section 3-6
HD setting (Rated current 8.0A= b012)
3Hz (Reduction rate: x0.8)
Trip time
[s]
60
0.5
0
16.0[A] 7.0
(200%) (87.2%)
Motor current [A]
Output current [A]
b020
b018
b016
0 b015 b017 b019
Output frequency [Hz]
Restriction area
0
Regenerating
Powering
0
B023
9.6 12.8[A]
(120%) (160%)
A004 Max. FQ
t
B023
t