Analog Outputs - Allen-Bradley PowerFlex Reference Manual

2-18

Analog Outputs

Analog Outputs
Explanation
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 source for the analog output by setting [Analog Outx
Sel].
342 [Analog Out1 Sel]
Selects the source of the value that
drives the analog output.
Configuration
The PowerFlex 70 standard I/O analog output is permanently configured as
a 0 -10 volt output. The output has 10 bits of resolution yielding 1024 steps.
The analog output circuit has a maximum 1.3% gain error and a maximum
7 mV offset error. For a step from minimum to maximum value, the output
will be within 0.2% of its final value after 12ms.
The PowerFlex 700 standard I/O analog output is permanently configured
as a 0 -10 volt output. The output has 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
Certain quantities used to drive the analog output are signed, i.e. 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 bitmapped parameter [Anlg Out Absolut].
Important: If absolute value is enabled but the quantity selected for output
is not a signed quantity, then the absolute value operation will
have no effect.
Scaling Blocks
The user defines the scaling for the analog output 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, as described in
the output voltage will vary linearly with the quantity being output. The
analog output voltage will not go outside the range defined by [Analog Out1
Lo] and [Analog Out1 Hi].
Default: 0 "Output Freq"
Options: See Table
Table
001
002
003
004
005
007
006
012
135
136
137
138
2.B, and