LMX SERIES™ OPERATION MANUAL
SECTION 7: Auxiliary I/O
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2018 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
LMX Series Power Source Operation Manual
Page 192 of 463
7.9
Analog Input Modes
The analog inputs support the following operating modes:
•
Input off – Input disabled. In this mode, these same inputs may be used for level
input programming per section 7.8.1, “Analog Inputs”, see page 190.
•
Amplifier mode (AUX)– Fixed gain AC amplifier Mode
•
Amplitude Modulation (AM) – Internal waveform amplitude is modulated with
external analog signal.
•
Analog Summing node (ADD) – Adds external input and internal waveform.
The gain of the analog input (one for each phase on three phase models) is as follows:
For AUX and ADD modes:
10V input = 250V*xfmr-ratio
(Same gain as PPS AMX Series)
For AM mode:
Gain = 1.0
Each mode is explained in more detail below.
7.9.1.1
Analog Input OFF
If no external input signal is used or no signal, it is best to turn these input off in case any
unintended noise pickup on these inputs affects the internal waveform.
7.9.1.2
Amplifier Mode (AUX)
In amplifier mode, any analog AC input signal is amplified by the LMX amplifier(s). Internal
programming references are ignored and the output amplitude is a fixed ratio time the
input signal amplitude. Signal input range is ±10Vpk.
Figure 7-9: Analog Input Amplifier (AMP) Mode
Frequency of the input signal must be controlled by the user to not exceed the maximum
output frequency at full-scale voltage.
R2
_
+
LMX OUTPUT
AUX INPUT
R1
GND1
