P9 ASD Installation and Operation Manual
39
Frequency Control (
The
Frequency Mode 1
(or the Frequency Mode 2)
setting
establishes the user-selected source of the frequency-
control input for the P9 ASD. The signal source selected
here is used for speed control unless the
Reference
Priority Selection
parameter is configured to switch this
setting automatically (see
) or if the
Override
feature
is enabled.
shows the hierarchy of the control
sources managed by the
Override
function. The level of the control item of the hierarchy is listed from
left to right, most to least, respectively. As indicated in the table, the
Override
setting may supersede
the selection at
Placing the EOI in the
Hand
mode selects the
RS485
(2-wire) as the
Frequency Mode 1
control
source.
Hand
mode operation may be superseded by other
Override
settings.
Example:
With the EOI set to
Hand
, the
Communication Board
input or the
RS485
(4-wire) input
will supersede EOI control input.
The remaining control sources may be placed into the
Override Mode
using communications.
The source of the
Frequency
control signal may be selected by:
setting,
• Placing an item from the
Frequency
control source selections in the
Override Mode
via
communications, or
• Placing the EOI in the
Hand
mode (places only the
RS485
[2-wire] in the Override Mode).
Possible
Frequency
control source selections include the following:
• Communication Board,
• RS485,
• EOI Keypad,
• Terminal Block (the default setting), or
•
setting (used if no other items are in the Override mode).
Note:
The
Terminal Board
is placed in the
Override Mode
for
Speed
control functions by
activating a discrete terminal that is assigned to
V/I Terminal Priority
. Once the
discrete terminal is activated,
V/I
is used as the
Terminal Board Override
speed-
control input.
Command and Frequency Control Selections
The user may select only one
Command
source and only one source for
Frequency
control. The
default settings for
Command
and
Frequency
control are
Terminal Block
and
RR
, respectively.
The P9 ASD has a command register that holds each of the items listed in
as a
Command
or
Frequency
source. The listed items are continuously scanned to determine if any of the
listed items are providing a
Command
or
Frequency
command.
The first active item of the
Command
section and the first active item of the
Frequency
section (both
are read from left to right) detected as having an active signal will be used for
Command
and
Frequency
control, respectively. If no items are detected as having an active signal, the settings of
and
will be used for
Command
and
Frequency
control, respectively.
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