Product Description
5.3 Cabinet Details
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
75
Cell Construction
GenIV MicroHarmony 750V Cells frames (40, 70, 100, and 140 Amp) have an identical
footprint, see Figure "GenIV Power Cell with Board Shown" (dimensions and mass are
detailed further in Chapter 3 of this manual). GenIV 750 V (200 and 260 Amp) cells also
have identical footprints. These cells are slightly larger but can use the same mounting as
the 40-140 amp cells within certain drive systems. The cells in any given drive are
mechanically and electrically identical, so that they may be interchanged. Each cell contains
its own Cell Control Board (CCB), which communicates to the centralized controller (NXG II)
via a fiber optic link. This link is the only connection between the Power Cells and the
controller, thus each cell is galvanically isolated from the main control.
A switch mode power supply located on the CCB allows the control power to be derived from
the individual 3-phase secondary connections of the transformer feeding the power cell line
inputs. This power supply is operational at a fraction of the rated voltage of the cell input
voltage. The Perfect Harmony controller, known as NXG II, provides central control and
interrogation of the nine cells, as detailed in previous chapters of this manual.
The following figures illustrate all power input/output terminals and fiber optic control
terminals. Power connections are made via power plugs; no hardware is required. Fiber optic
control connections are made at the front of the cell directly to the cell control board. The cell
control board and power electronics can be accessed and tested at the same time by
rotating the cell 90° as shown (only qualified technicians should examine the Power cells),
removing the chassis top cover, and opening the CCB access plate (see Figure "GenIV
Power Cell with Board Shown"). The + and - DC bus can be accessed by removing the top
lid (not shown). Threaded studs are located on the bus for test connections.
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Figure 5-14 GenIV Power Cell with Board Shown
The 40, 70, 100, and 140 Amp power cells are only differentiated by the number of
electrolytic capacitors that are installed and the semiconductor devices (diode rectifiers,
IGBTs) on the heat sink. The 200 and 260 amp power cells use a different frame size.
However, the 200 and 260 amp cells are differentiated only by the number and type of
capacitors and semiconductor devices.
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