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UM1M820BNA User Instructions
Issue AH, March 4, 2013 Spec No. 1M820BNA (Model M820B)
Spec No. 1M820DNA (Model M820D)
164 Chapter 6. Replacement 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.
CHAPTER 6. REPLACEMENT PROCEDURES
6.1 ACU+ Controller Replacement
Warning: ACU+ CONTROLLER HANDLING.
Installation or removal of the ACU+ Controller requires careful handling. To avoid
possibility of ACU+ Controller damage from static discharge, a static wrist strap
grounded through a one megohm resistor should always be worn when handling the
ACU+ Controller. ESD-protective packaging material must also be used when
carrying/shipping the ACU+ Controller.
Note: Depending on your network security settings, when you remove a device that is connected to your
network and assign the same IP address to the replacement device, you may not be allowed to
communicate with the replacement device over the network. Contact your network administrator
for assistance.
The ACU+ Controller is hot swappable. It can be removed and installed with the system operating and
without affecting the output bus.
Procedure
1) Before performing this procedure, ensure the replacement ACU+ Controller contains the same
configuration file as the existing ACU+ Controller. Refer to the Configuration Label on the side of
the replacement ACU+ Controller for the Configuration Part Number. If the existing Controller is
operational, navigate the menus to view its configuration file (MAIN SCREEN/ESC/ENT/ENT).
Figure 9
ACU+ Controller Configuration Label Location
2) Performing this procedure may activate external alarms. Do one of the following. If possible,
disable these alarms. If these alarms cannot be easily disabled, notify the appropriate personnel to
disregard any future alarms associated with this system while this procedure is being performed.
Configuration File
Part Number Label
M820D
M820B