Theory
3.3 The Control System
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
43
When advanced cell bypass is included with a drive, the modulator communicates with the
bypass controller and monitors hardware faults such as IOC, ESTOP, and power supply
faults. The Bypass Controller is configured to control the cell bypass (mechanical)
contactors. After detection of a cell fault, the processor communicates with the Bypass
Controller to bypass the faulted cells. In addition to bypassing cells, the Bypass Controller
constantly checks the status of the contactors to verify if they are in their requested states.
The Fiber Optic Interface transfers data between the modulator and the cells over dedicated
fiber optic channels. Each cell receives its firing commands and status signals through a full
duplex fiber optic channel.
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Figure 3-9 Block Diagram of Harmony Control Structure
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