Application Guide

Section 5877 User Instructions
Issue AQ, January 15, 2013 Spec. No. 582140000 (Models 802NLDB, 802NLEB and 802NL-B)
Page 3-18 Chapter 3. System Operating Procedures
This document is property of Emerson Network Power, Energy Systems, North America, Inc. and contains confidential and proprietary information owned by Emerson Network Power, Energy
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.
SETTING RECTIFIER SEQUENCING DELAY TIME PERIOD
The MCA can be set to provide Rectifier Sequencing. When the MCA senses an “AC
POWER IS OFF TO All PCUs” alarm, it turns off all Rectifiers. When the “AC POWER IS
OFF TO ALL PCUs” alarm clears, the MCA turns on Rectifier #1, then turns on the other
Rectifiers starting with Rectifier #2 every n seconds (n is user programmable from 1 to 20
seconds). If the MCA fails or the communication link is broken during a Rectifier
Sequencing routine, all Rectifiers turn on immediately.
The time delay between turning individual Rectifiers on is adjustable from 1 to 20
seconds, or you can set the feature to be disabled. Refer to the following procedure.
Procedure
1) With SYSTEM OK being displayed on the MCA Interface Pad, press and release
the FUNCTION SET ENTER key. The FUNCTION MENU is displayed.
or
In the MAIN ALARM MENU, repeatedly press and release the FUNCTION
SELECT DOWN arrow key until "GO TO FUNCTION MENU" is displayed. Press
and release the FUNCTION SET ENTER key. The FUNCTION MENU is
displayed.
2) Repeatedly press and release the FUNCTION SELECT DOWN arrow key until
"CHANGE CONFIGURATION PARAMETERS" is displayed. Press and release
the FUNCTION SET ENTER key.
3) Press and release the FUNCTION SELECT DOWN arrow key until "PCU
SEQUENCE DELAY = ss SECONDS" or "PCU SEQUENCING IS DISABLED" is
displayed.
4) Press and release the ALARM CUTOFF and FUNCTION SET ENTER keys
simultaneously.
5) Observe the value displayed. Press and hold the FUNCTION SET YES (+) or
NO (-) key until the desired value or "PCU SEQUENCING IS DISABLED" is
displayed. Release the key.
6) With the desired value or "PCU SEQUENCING IS DISABLED" being displayed,
press and release the FUNCTION SET ENTER key.
7) “ARE YOU SURE?” is displayed. Press and release the FUNCTION SET YES
(+) key.
Note: The Rectifier sequencing feature will not be changed and the adjustment
mode will be exited if the FUNCTION SET YES (+) key is not pressed
within 10 seconds of the “ARE YOU SURE?” prompt.
8) To return to the beginning of the MCA Logic Tree, press and release the
FUNCTION SET YES (+) and NO (-) keys simultaneously.