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Perfect Harmony GENIII/e User's Manual
information and system program for the VFD, and therefore allows the Microprocessor Board to be replaced without
the need to re-program the VFD.
Note: If the Microprocessor Board is replaced, the Flash Disk should be moved to the new board.
See Figure 2-13.
The System Interface board collects the drive input and output feedback signals and sends them to the Analog to
Digital board. The Analog to Digital board executes the conversion at specified intervals and sends digital
representations of the feedback signals to the Microprocessor board. The Microprocessor board then computes the
next set of values to be sent to the Digital Modulator and sends them. The Digital Modulator then determines the
switching commands for each cell and compiles a message with this command for each cell. These messages are then
sent through the Fiber Optic Interface boards. Refer to Figure 2-12.
Note that the number of Fiber Optic Interface Boards and the number of fiber optic channels varies, depending on the
number of cells in the drive.
Also shown in Figure 2-12 is a communications board. This board provides a direct interface to a Modbus network
and allows network adapter boards for several other industrial networks to be connected to the drive control. A
typical schematic of the master control is shown in Figure 2-12.
A1A19000405A: Version 1.3
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Hardware Components
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