Application and Operation
6.6 Energy Saver
Product User Manual
122 Operating Instructions, Version AE 12/2009, A5E01454341C
6.6 Energy Saver
The NXG Control includes provisions for output speed demand entry as required for a
specific application. The active reference source is configured per specific system
requirements and can be dynamically changed. This is implemented via the drive’s "System
Program" as defined in Section 5.4. An overview of each of the major functional blocks is
defined next, and a detailed description is provided in the
NXG Control Manual, 19001588
.
Analog Input Sources
The NXG control provides a means to provide multiple analog input sources that can be
selected as demand inputs to the system. The control scales these analog values into
internal units, and monitors the levels for possible loss of signal conditions. The control
includes provisions for predetermination of VFD action upon loss of signal conditions,
including maintain speed, transition to preset speed, or trip VFD.
Ratio Control
The Ratio control is simply a fractional scaling unit available for the analog reference signals.
This feature allows multiple drives to share the same reference signal with rescaled output
signal levels.
PID Controller
The PID loop is programmable from User Interface. The PID Command set point can be
either an external Analog Input or an internal set point. The PID Feedback is always from an
Analog Input. The Proportional, Integral, and Derivative gains, as well PID output limits, are
programmable.
Set Point Sources
Set Points are internal menu entries that are static values based on user entry, keypad
settings, or remote demand from a network communication interface. There are a total of
eight inputs that are menu entries from remote communications. There are two special
additional entries that are reserved for safety override and jog level set points.
● Keypad
– Front panel keypad (or ToolSuite computer) used to set speed demand
● Increment/Decrement (Sample and Hold)
– Digital inputs (x2) that increase/decrease raw speed demand at the active
acceleration/deceleration rate, while input is maintained
● Increment/Decrement Step
– Digital Inputs (x6) that provide programmable step change to output demand each
time input transitions from Low to High state
● Preset levels
– Multiple user-defined preset values via menu system
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