2-56 Digital Inputs
decremented by external devices. The MOP value will be retained
through a power cycle.
While the “MOP Increment” input is closed, MOP value will increase at
rate contained in [MOP Rate]. Units for rate are Hz per second.
While the “MOP Decrement” input is closed, MOP value will decrease
at rate contained in [MOP Rate]. Units for rate are Hz per second.
If both the “MOP Increment” and “MOP Decrement” inputs are closed,
MOP value will stay the same.
The terminal block bit must be set in the [MOP Mask] and [Logic Mask]
parameters in order for the MOP to be controlled from the terminal
block.
In order for the drive to use the MOP value as the current speed
reference, either [Speed Ref A Sel] or [Speed Ref B Sel] must be set to
“MOP.”
• Stop Mode B
This digital input function selects between two different drive stop
modes. See also
Stop Modes on page 2-158.
If the input is open, then [Stop Mode A] selects which stop mode to use.
If the input is closed, then [Stop Mode B] selects which stop mode to
use. If this input function is not configured, then [Stop Mode A] always
selects which stop mode to use.
• Bus Regulation Mode B
This digital input function selects how the drive will regulate excess
voltage on the DC bus. See also
Bus Regulation.
If the input is open, then [Bus Reg Mode A] selects which bus regulation
mode to use. If the input is closed, then [Bus Reg Mode B] selects which
bus regulation mode to use. If this input function is not configured, then
[Bus Reg Mode A] always selects which bus regulation mode to use.
• PI Enable
If this input function is closed, the operation of the Process PI loop will
be enabled.
If this input function is open, the operation of the Process PI loop will be
disabled. See
Process PI Loop on page 2-116.
• PI Hold
If this input function is closed, the integrator for the Process PI loop will
be held at the current value, which is to say that it will not increase.
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