Installation Instructions

Section 5876 Installation Instructions
Issue AT, April 26, 2013 Spec. No. 582140000 (Models 802
NLDB, 802NLEB and 802NL-B)
Page 4-62 Chapter 4. Making Electrical Connections
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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.
MCA “ALTERNATE CURRENT LIMIT” FEATURE
Note: Requires MCA firmware version 2.2.0.6, or later.
The MCA Alternate Current Limit feature provides a means to limit the output current of
all rectifiers based on the state of an external signal. The rectifiers output current is
limited to a percentage of rectifier output capacity as configured by the user. A binary
input on an installed MCA I/O circuit card is used to monitor the external signal that
triggers the current limiting action.
Admonishments
Circuit Card Handling
Refer to the section in Chapter 3 titled Installing MCA and LMS Circuit Cards prior to
installing the MCA I/O circuit card.
Requirements and Conditions
An external signal must be provided to indicate to the MCA to place the rectifiers in the
“Alternate Current Limit” mode. The signal must be wired to binary input #4 of the MCA
I/O circuit card.