Digital Inputs 2-55
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 by using the terminal block digital inputs, and the
Speed Select Inputs will have no effect on which reference
the drive is currently using.
Because any combination of open / closed conditions (or unwired
condition) commands a reference source, the terminal block seeks accel
ownership as soon as the “Accel 2” input function is configured, which
may happen at power-up. In order for the terminal block to actually gain
ownership, the masks must be set up correctly (see above) and no other
device can currently have accel ownership. Once the terminal block
gains accel ownership, it will retain it until shutdown, until the [Accel
Mask] or [Logic Mask] bits for the terminal block are cleared, or until
“Accel 2” is unconfigured.
For the “Decel 2” input function, deceleration rate selection ownership is
handled in a similar fashion to acceleration rate selection ownership.
• Acc2 & Dec2
In the second scheme, the “1” rates are combined (Acc and Dec) and the
“2” rates are combined. A single input function is used to select between
[Accel Time 1]/[Decel Time 1] and [Accel Time 2]/[Decel Time 2]. This
input function is called “Acc 2 & Dec 2”.
If function is open, then drive will use [Accel Time 1] as the acceleration
rate and [Decel Time 1] as the deceleration rate. If function is closed,
then drive will use [Accel Time 2] as the acceleration rate and [Decel
Time 2] as the deceleration rate.
The same ownership rules as above apply.
• MOP Increment, MOP Decrement
These inputs are used to increment and decrement the Motor Operated
Potentiometer (MOP) value inside the drive. The MOP is a reference
setpoint (called the “MOP Value”) that can be incremented and
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