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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 55
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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.
Table 4
Full Alarm Name - WEB
(Abbreviated
Alarm Name - LCD)
Alarm Description
Action to Correct
OB Battery Fuse Alarms (SM-DU Module must be present in system)
(OB Batt Fuse)
Fuse 1 Alarm
(Fuse 1 Alarm)
Fuse #1 is open.
Find out and eliminate the reason the
fuse is open before replacing. Check
for overload or short circuit. If the fuse
was manually removed, check with the
person that removed it before
reinserting it.
…
…
Fuse 4 Alarm
(Fuse 4 Alarm)
Fuse #4 is open.
SMDU Battery Fuse Unit Alarms (SM-DU Module must be present in system)
(SMDU Bat Fuse)
Batt Fuse 1 Alarm
(Batt Fuse 1 Alm)
Battery fuse #1 is open.
Find out and eliminate the reason the
fuse is open before replacing. Check
for overload or short circuit. If the fuse
was manually removed, check with the
person that removed it before
reinserting it.
…
…
Batt Fuse 4 Alarm
(Batt Fuse 4 Alm)
Battery fuse #4 is open.
DC Distribution Alarms
(DC Distr)
Over Voltage 1
(Over Voltage 1)
DC output is above over voltage 1
threshold.
Check to see why voltage is high.
Over Voltage 2
(Over Voltage 2)
DC output is above over voltage 2
threshold.
Under Voltage 1
(Under Voltage 1)
DC output is below under voltage 1
threshold.
Check to see why voltage is low.
Under Voltage 2
(Under Voltage 2)
DC output is below under voltage 2
threshold.
Over Voltage 1 (24V)
(24V Over Volt1)
DC output is above over voltage 1
threshold.
Check to see why voltage is high.
Over Voltage 2 (24V)
(24V Over Volt2)
DC output is above over voltage 2
threshold.
Under Voltage 1 (24V)
(24V Under Volt1)
DC output is below under voltage 1
threshold.
Check to see why voltage is low.
Under Voltage 2 (24V)
(24V Under Volt2)
DC output is below under voltage 2
threshold.