Command Mode and Frequency Mode Control
Command control includes instructions such as Stop, Run, Jog, etc. The source of the Command signal must be established for normal operation.
Frequency commands control the output speed of the ASD. The source of the frequency (speed) control signal must be established for normal operation.
The source of the command control and speed control may be either internal or external. Once the source signal is selected for either function, the system may be configured to use the selected signal all of the time or switch under
Command and Frequency control may be carried out using any one of several control methods (signal sources) or combinations thereof. In the event that multiple control commands are received, the signal sources are assigned priority levels. The primary control method for Command and Frequency control uses the settings of F003 and F004, respectively.
Command Control (F003)
The Command Mode selection of F003 establishes the primary source of the command input for the ASD. However, the Override feature may supersede the F003 setting as indicated in Table 5.
Table 5 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 Override setting may supersede the F003 setting.
Placing the EOI in the Local mode selects either the RS232/RS485 or the Common Serial (TTL) as the Command Mode control source. Once in the Local mode, the LCD Port Connection setting determines if the RS232/RS485 or the Common Serial (TTL) will be used for Command control. Local mode operation may be superseded by other Communications Override settings.
Example: With the EOI set to Local and the LCD Port Connection set to Common Serial (TTL), setting the Communication Card or RS232/RS485 control to Override will supersede the Common Serial (TTL) setting.
The remaining control sources may be placed into the override mode using communications. The source of the Command control signal may be selected by:
•The F003 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 the Common Serial [TTL] in the Override mode).
Possible Command signal source selections include the following:
•Use Control Terminal Strip (default),
•Use LED Keypad Option,
•Use Common Serial (TTL),
•Use RS232/RS485,
G7 ASD Operation Manual | 31 |
