System Application Guide
Spec. No. 582136600 (Model 211
Issue AU, February 21, 2014
Page 1 of 105
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
Description: The NetSure™ 211NGFB DC Power System is a complete integrated power system
containing rectifiers, intelligent control, metering, monitoring, and distribution. This power
system consists of the following mounted in a 1RU or 2RU high by 19” or 23” wide shelf.
• 500W or 1000W Rectifier Modules
The 1RU high by 19” wide shelf accommodates
two (2) 500W or 1000W Rectifier Modules.
The 1RU high by 23” wide shelf accommodates
three (3) 500W or 1000W Rectifier Modules.
The 2RU high by 19” wide shelf accommodates
four (4) 500W or 1000W Rectifier Modules.
The 2RU high by 23” wide shelf accommodates
six (6) 500W or 1000W Rectifier Modules.
The Rectifier Modules provide load power, battery float current, and battery recharge
current during normal operating conditions. The Rectifier Modules are designed to
provide constant power. They are designed with the latest patented switch-mode
technology using DSP (Digital Signal Processing) functionality for efficient operation.
This means that, within the normal operating ambient temperature range and input
voltage range, the maximum available output power is a constant 500W or 1000W.
Within these ranges, the Rectifier Modules operate in one of three modes, depending
upon load demands. Transition between modes is completely automatic. If ambient
temperature rises above or input voltage falls below acceptable values, Rectifier
Modules continue to operate but at derated output power levels.
1) Constant Voltage Mode: For any initial output voltage setting from 42 to 58
volts, output voltage remains constant regardless of load. This is the normal
operating condition, in which loads are being supplied and batteries are float
charged. Rectifier Modules operate in the Constant Voltage Mode unless load
increases to the point where
the product of load current and
output voltage is approximately
500W or 1000W.
2) Constant Power Mode: As
load increases above
approximately 500W or 1000W
(non-adjustable), output current
continues to increase, but
output voltage decreases as
required to maintain constant
output power. Rectifier
Modules operate in the
Constant Power Mode unless
load continues to increase to
the point where the current limit
setting is reached.
3) Constant Current Mode: If
load increases above the
current limit setting, output
voltage decreases linearly to
maintain output current at
List 1 (List 2 similar)
List 5 (List 6 similar)