74
"A" Group: Standard Functions Section 3-5
The example graph below shoes a typical analog input waveform. The filter
removes the noise spikes. When a speed change (such as level increase)
occurs, the filter naturally has a delayed response. Due to the deadband fea-
ture (
A016=31), the final output changes only when the 30-sample average
moves past the deadband threshold.
!Tip The deadband feature is useful in applications that requires a very stable out-
put frequency but use an analog input for the speed reference. Example appli-
cation: A grinding machine uses a remote potmeter for operator speed input.
After a setting change, the grinder maintains a very stable speed to deliver a
uniform finished surface.
3-5-3 Multi-speed and Jog Frequency Setting
Multi-speed - The MX2 inverter has the capability to store and output up to
16 preset frequencies to the motor (
A020 to A035). As in traditional motion ter-
minology, we call this multi-speed profile capability. These preset frequencies
are selected by means of digital inputs to the inverter. The inverter applies the
current acceleration or deceleration setting to change from the current output
frequency to the new one. The first multi-speed setting is duplicated for the
second motor settings (the remaining 15 multi-speeds apply only to the first
motor).
Noise spikes
Speed increase given
Analog input
16-sample avg.
0
+0.1
-0.1
Threshold exceeded
Deadband
New deadband
0
+0.1
-0.1
Output freq.
reference
Hz
Small step change
t
A016 = 31
"A" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
a019 Multi-speed operation selection Select codes:
00... Binary operation (16 speeds
selectable with 4 terminals)
01... Bit operation (8 speeds
selectable with 7 terminals)
8 00 -
A020 Multi-speed freq. 0 Defines the first speed of a multi-
speed profile, range is 0.0 / start
frequency to 400Hz
*1
A020 = Speed 0 (1st motor)
9 6.0 Hz
A220 Multi-speed freq. 0, 2
nd
motor Defines the first speed of a multi-
speed profile or a 2
nd
motor,
range is 0.0 / start frequency to
400Hz
*1
A220 = Speed 0 (2nd motor)
9 6.0 Hz
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