Perfect Harmony GENIII/e User’s Manual Hardware Components
A1A19000405A: Version 1.3 2-11
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Figure 2-10: Cell Section (Typical) of a GENIII style Perfect Harmony Drive
A switch mode power supply located on the Cell Control/Gate Driver Board allows the control power to be derived 
from the individual 3-phase secondary connections of the transformer.
The Control Section contains PC boards, which provide central control of the Perfect Harmony drive system. The 
Control Section is physically and electrically isolated from all medium voltage for safety.
Control for each of the output cells is provided via a fiber optic communications link between the Master Control 
System and the Cell Control/Gate Driver Board located within each output cell.
The following tables give length and weight information for many common configurations of sectional Perfect 
Harmony drives, based on 60 Hz input power at the voltages listed. If applications require inputs at 50 Hz or 
horsepowers not listed, sizes and weights will increase.
*
Note: The ventilation information (in CFM) and losses information (in BTUs) given in the 
following tables represent worst case conditions. Actual values may vary based on load, blower 
size, cell size and transformer size.