H9 ASD Installation and Operation Manual
37
Frequency Control
(
F004
)
The
Frequency Mode 1
(or the Frequency Mode 2)
setting establishes the user-selected source of the
frequency-control input for the H9 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 F200) or if the
Override
feature is enabled.
Table 3 on pg. 38
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
F004
.
Placing the EOI in the
Local
mode selects the
RS485
(2-wire) as the
Frequency Mode 1
control
source.
Local
mode operation may be superseded by other
Override
settings.
Example:
With the EOI set to
Local
, 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:
• The
F004
setting,
• Placing an item from the
Frequency
control source selections in the
Override Mode
via
communications, or
• Placing the EOI in the
Local
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
•
F004
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
assigning a discrete terminal to
V/I Terminal Priority
and connecting the terminal to
CC
. Once the discrete terminal is activated,
V/I
is used as the
Terminal Board
Override
control item.
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 H9 ASD has a command register for each item listed as a
Command
or
Frequency
source. The
registers store the
Override
setting for each control source. The registers are continuously scanned to
determine if any of the listed items are in the
Override Mode
.
For each scan cycle, the command registers of the control sources are scanned for the
Override
setting
in the order that they are listed in
Table 3
. The first item of the
Command
section and the first item of
the
Frequency
section detected as being in the
Override Mode
will be used for
Command
and
Frequency
control, respectively. If no items are detected as being in the
Override Mode
, the settings of
F003
and
F004
will be used for
Command
and
Frequency
control, respectively.
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