Product Description
5.3 Cabinet Details
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
79
3. If F
OUT
is operated continuously below 10 Hz, de-rate cell current as:
I
BASE
2
= (0.5 + F
OUT
/ 20)
4. If altitude exceeds 3300 FASL, then de-rate cell current as:
I
BASE
3
= (1-0.00003*[ALT-3300])
5. If ambient temperature exceeds 45 °C, then de-rate cell current as:
I
BASE
4
= ([55 - T
AMB
]/15)^0.57
6. Use only the smallest de-rate factor from IBASE 1, IBASE 2, IBASE 3, and
IBASE 4 to size the cell (de-rates are not compounded). Select the smallest cell
frame size equal or greater than I
MTR
/
IBASE (1,2,3, or 4)
1* Excludes long cable provisions
2* Maximum ambient of 50 C and maximum altitude of 6562 feet
Cell Bypass
As an option, the core GenIV drive can be equipped with Cell Bypass. Each cell output is
fitted with a single pole double throw electromechanical contactor (as shown in Figure
"Electromechanical Contactor" below).
Figure 5-18 Electromechanical Contactor (Single Pole, Double Throw) for 4160 V units
The bypass contactors are mounted behind the cell in the air plenum. All connections are
made with insulated wire and bus connections. The Bypass Power Supply (BPPS) and
Bypass Control Circuit (BCC) are located in the I/O Section. The BCC connects to the NXG
controller via a fiber optic link and contactor controls are wired to the BCC. The BPPS is
energized from one of the transformer secondary windings and is referenced to the VFD
output neutral. Refer to Sections 1.3.5 and 5.13.1 for further details concerning power Cell
Bypass.
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