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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 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 F200) or if the Override feature
is enabled.
Table 4 on pg. 40
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 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 Hand mode operation may be superseded by other Override settings.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:
• The
F004
• 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
•
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
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
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
F004
will be used for Command and Frequency control, respectively.
P9 ASD Installation and Operation Manual
shows the hierarchy of the control
setting,
Table 4 on pg. 40
as a
F003
39
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