Example Of Scaled Analog Input Signals; Example Of Scaled Analog Input Signals With Offset - Eaton M-Max Series User Manual

Analog Inputs, continued
Access
PNU ID RUN
P2.5 390
P2.6 391
P2.7 392
P2.8 389
Scaled Value Range (AI1, AI2)
The following graphs show examples of the curve
characteristics of the scaled and non-scaled input signals.
Example A
P2.2 (P2.6) = 30%, P2.3 (P2.7) = 80%
The incoming analog input signal 0–10V (4–20 mA) is used
here in the selected range from 30 to 80%. This limited
signal range is predefined as 0–100% input signal (AI scal ):
as frequency setpoint value from 0–f max (P6.4)
●
as a process variable from 0–100% actual value for the PID
●
controller

Example of Scaled Analog Input Signals

AL
scal.
100%
0
0 30 80 100 (%)
P2.2 P2.3
P2.6 P2.7
Value/Range Description
— AI2 signal range (analog input)
Depending on the switch position of microswitch S3
(FS = PID controller, actual value)
0 S3 = V: 0–10V, voltage signal
S3 = mA: 0–20 mA, current signal
1 With live-zero,
S3 = V: 2–10V, voltage signal
S3 = mA: 4–20 mA, current signal (FS, see P9.6)
At P8.1 it is possible to set the response of the MMX
to a setpoint error (live zero)
— AI2 custom minimum
Like P2.2 —
— AI2 custom maximum
Like P2.3 —
— AI2, filter time
Like P2.4 —
M-Max Series Adjustable Frequency Drive MN04020003E—October 2013 www.eaton.com
Example B
P2 (P2.6) = –30%, P2.3 (P2.7) = 100%
The incoming analog input signal 0–10V (4–20 mA) is not
evaluated in the selected range from 0–30%. In relation to
the 30%-signal, a constant offset signal of 23% is predefined
in this case. The scaled input signal (AI scal ) is therefore
23–100%:
as frequency setpoint value: 23% f max –f max (P6.4)
●
as a process variable: 23–100% actual value for the PID
●
controller

Example of Scaled Analog Input Signals with Offset

AI
scal.
100%
23%
–30 0
P2.2
P2.6
Parameters
Factory Setting
(P1.3)
1
0.00
100.00
0.1
100 (%)
P2.3
P2.7
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