48 ACE-tronics G9 ASD Installation and Operation Manual
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 ASD. The signal source
selected here is used for frequency control unless the
Reference Priority Selection parameter is configured
to switch this setting automatically (see F200) or if the
Override f
eature is enabled.
Table 5 on pg. 49 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 EO
I 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Local mode operation may be superseded by other Override settings.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: Wi
th 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 F
requency control source selections in the Override mode via
communications, or
• Placing the EO
I 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 Board (the default setting), or
• F004 setting (used if no other items are in the Override mode).
Note: Th
e Terminal Board is placed in the Override mode for frequency control functions
by assigning a discrete terminal to V/I Terminal Priority and activating the terminal
by applying 120 VAC to the terminal. 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 Board and RR, respectively.
The 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 O
verride setting in
the order that they are listed in Table 5. The first item of the Com
mand section and the first item of the
Frequency section detected as being in the Override mode will be used for Command and Frequency
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