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User Instructions UM1M820BNA
Spec No. 1M820BNA (Model M820B) Issue AH, March 4, 2013
Spec No. 1M820DNA (Model M820D)
Chapter 2. Operation 35
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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.
2.6 Available Alarms
Table 4 lists the alarms that you can scroll through in the Alarm Severity and Alarm Relay submenus.
These are also the possible alarms that display in the Active Alarms sub-menu. Table 4 also provides
guidelines for alarm correction.
Note: These instructions describe the complete functionality of the ACU+. Some functionality is
dependent on hardware connected to the ACU+. Some alarms listed may not display in your
system or may be named differently. Refer to the ACU+ Configuration Drawing (C-drawing)
furnished with your system.
Table 4
Full Alarm Name - WEB
(Abbreviated
Alarm Name - LCD)
Alarm Description
Action to Correct
Power System Alarms
(Power System)
Supervision Unit Fault
(SelfDetect Fail)
Controller self detection test fails.
Replace the Controller.
CAN Communication Failure
(CAN Comm Fail)
CAN bus communications failure.
Check communications cables.
Outgoing Alarms Blocked
(Alarm Blocked)
Alarm relays are forced in the "off"
state and alarms are blocked from
changing the relay state.
Verify why Controller setting was
changed before changing back.
Maintenance Time Limit
Alarm
(Mtnc Time Alarm)
Controller issues a maintenance
alarm.
Perform routine maintenance and
reset maintenance timer.
“Config Error
(Backup Config)”
(Config Error 1)
Configuration error 1.
Reload configuration file.
“Config Error
(Default Config)”
(Config Error 2)
Configuration error 2.
Imbalance System Current
(Imbalance Curr)
Current sharing imbalance.
Check to see why current sharing is
imbalanced.
Over Load
(Over Load)
Output overload condition.
Check to see why output is
overloaded.
SPD
(SPD)
Surge protection device needs
attention.
Check surge protection device.
EStop/EShutdown
(EStop/EShutdown)
System in emergency stop or
emergency shutdown mode.
Check to see why the system was
placed in this mode.