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UM1M820BNA User Instructions
Issue AH, March 4, 2013 Spec No. 1M820BNA (Model M820B)
Spec No. 1M820DNA (Model M820D)
112 Chapter 3. Local Display Menus
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.
Rectifier Expansion
Rectifier Expansion Menu
Up to four (4) ACU+ Controllers can be connected together when a power system requires a
greater number of rectifiers than can be controlled by a single ACU+ Controller. One (1) Controller
is designated as the primary Controller, the others as secondary Controllers. The rectifiers
controlled by the secondary Controllers are designated as RectifierGroup 2 though 4 in the menus.
Primary/Secondary Procedure:
Note: Changing the Rectifier Expansion setting may take more than 3 minutes for the ACU+ to
configure the feature.
1) Connect the ACU+ Controllers in the multiple bays via the RS485 interface.
2) Set one of the ACU+ Controllers as the Primary Controller (see below).
3) Set all other ACU+ Controllers as Secondary Controllers (see below).
4) Set the Address of the ACU+ Controllers set as Secondary Controllers to 201, 202, or 203
(see below). Note that each Secondary Controller must be set to a different address.
Menu Navigation: Main Menu / Quick Setting / Rectifier Expansion
Note: For WEB Interface; menu items are found under Quick Settings / Rectifier Expansion.
"Rectifier Expansion" Parameter Settings:
Rect Expansion
Inactive: Select this option if this is the only ACU+ Controller in the power system.
Primary: Select this option if the power system consists of multiple bays with multiple
ACU+ Controllers, and this ACU+ Controller is to be the Primary Controller. Note that
only one (1) ACU+ Controller can be set as the Primary Controller.
Secondary: Select this option if the power system consists of multiple bays with
multiple ACU+ Controllers, and this ACU+ Controller is to be a Secondary Controller.
Address (Slave): Sets the address of an ACU+ Controller set as a Secondary Controller.