Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 14)

10 Analog Outputs
Analog Outputs Each drive has one or more analog outputs that can be used to annunciate a wide
variety of drive operating conditions and values. The user selects the analog output
source by setting [Analog Out Sel].
Configuration
The analog outputs have 10 bits of resolution yielding 1024 steps. The analog
output circuit has a maximum 1.3% gain error and a maximum 100 mV offset error.
For a step from minimum to maximum value, the output will be within 0.2% of its
final value after 12ms.
Absolute (default)
Certain quantities used to drive the analog output are signed, e.g. the quantity can
be both positive and negative. The user has the option of having the absolute value
(value without sign) of these quantities taken before the scaling occurs. Absolute
value is enabled separately for each analog output via the bit enumerated parameter
[Anlg Out Absolut].
Scaling
The scaling for the analog output is defined by entering analog output voltages into
two parameters, [Analog Out1 Lo] and [Analog Out1 Hi]. These two output
voltages correspond to the bottom and top of the possible range covered by the
quantity being output. Scaling of the analog outputs is accomplished with low and
high analog parameter settings that are associated with fixed ranges (see User
Manual) for each target function. Additionally, the PowerFlex 700VC contains an
adjustable scale factor to override the fixed target range.
Examples
This section gives a few examples of valid analog output configurations and
describes the behavior of the output in each case.
Example 1: Unsigned Output Quantity
− [Analog Out1 Sel] = “Output Current”
− [Analog Out1 Lo] = 1 volt
− [Analog Out1 Hi] = 9 volts
70EC 700VC 700H
✔ ✔
10V
[Analog Out1 Hi]
[Analog Out1 Lo]
0V
0% 200%
Output Current
Analog
Output Voltage