GX9 ASD Installation and Operation Manual 67
Note: The Terminal Board is placed in the Override mode by assigning a discrete input
terminal to Terminal Command Priority and connecting the terminal to CC. Upon
activation (Run command required), the Terminal Board settings will be used for
Override Command control (F, R, Preset Speeds, etc.).
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 speed control unless
the Reference Priority Selection parameter is configured to automatically switch this setting (see
F200) or if the Override feature is enabled (via communications or via the Local mode operation).
Table 6 on page 68 shows the hierarchy of the control sources managed by the Override function. The
level of the control item on the hierarchy is listed from left to right, most to least, respectively. As
indicated in the table, the F004 setting may be overridden by any of the other input sources.
Placing the EOI in the Local mode selects either RS232/RS485 or TTL as the Frequency Mode 1
control source. Once in the Local mode, the EOI Port Address (Program Communications
Communications Settings EOI Port Address) setting determines if RS232/RS485 or TTL will be
used for Frequency Mode 1 control. Local mode operation may be superseded by Communications
activity.
Example: With the EOI set to Local and the EOI Port Address set to TTL, an input signal received
from the Communication Card or RS232/RS485 will supersede any received TTL command.
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 list below in the Override mode via communications, or
• Placing the EOI in the Local mode (places only the RS232/RS485 or TTL in the Override mode).
Possible Frequency control source selections include the following:
• Communication Card,
• RS232/RS485,
• Common Serial (TTL),
• CN8 Option,
• Terminal Board (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 by assigning a discrete input
terminal to Terminal Frequency Priority and connecting the terminal to CC. Upon
activation, VI/II is used as the Terminal Board Override control item.
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