Allen-Bradley PowerFlex 70 Reference Manual page 79

• Auto/Manual
The Auto/Manual facility is essentially a higher priority reference select. It
allows a single control device to assume exclusive control of reference select,
irrespective of the reference select digital inputs, reference select DPI
commands, the reference mask, and the reference owner.
If the "Auto/Manual" input function is closed, then the drive will use one of
the analog inputs (defined by [TB Man Ref Sel]) as the reference, ignoring the
normal reference selection mechanisms. This mode of reference selection is
called "Terminal Block Manual Reference Selection Mode".
If this input function is open, then the terminal block does not request
manual control of the reference. If no control device (including the terminal
block) is currently requesting manual control of the reference, then the drive
will use the normal reference selection mechanisms. This is called "Automatic
Reference Selection" mode.
The drive arbitrates among manual reference requests from different control
devices, including the terminal block.
• Accel 2 / Decel 2
The Acceleration/Deceleration Rate Control input functions (Acc/Dec
input functions for short) allow the rate of acceleration and deceleration for
the drive to be selected from the terminal block. The rates themselves are
contained in [Accel Time 1], [Decel Time 1], [Accel Time 2], and [Decel
Time 2]. The Acc/Dec input functions are used to determine which of these
acceleration and deceleration rates are in effect at a particular time.
The terminal block bit must be set in the [Accel Mask] and [Logic Mask]
parameters in order for the acceleration rate selection to be controlled from
the terminal block. The terminal block bit must be set in the [Decel Mask]
and [Logic Mask] parameters in order for the deceleration rate selection to be
controlled from the terminal block.
There are two different schemes for using the Acc/Dec input functions. Each
one will be described in its own section.
• Accel 2, Decel 2
In the first scheme, one input function (called "Accel 2") selects between
[Accel Time 1] and [Accel Time 2], and another input function (called
"Decel 2") selects between [Decel Time 1] and [Decel Time 2]. The open
state of the function selects [Accel Time 1] or [Decel Time 1], and the closed
state selects [Accel Time 2] or [Decel Time 2].
Important: Acc/Dec Control is an "Exclusive Ownership" function (see
Owners). This means that only one control device (terminal
block, DPI device, HIM, etc.) at a time is allowed to select the
Acc/Dec rates. The terminal block must become Acc/Dec
"owner" before it can be used to control ramp rates. If another
device is currently the reference owner (as indicated by
[Reference Owner]), it will not be possible to select the reference
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
Digital Inputs
79