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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 57
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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
LVD 2 Disconnected
(LVD 2 Disconn)
LVD2 contactor is in disconnect mode.
--
LVD 1 Contactor Failure
(LVD 1 Failure)
LVD1 contactor has failed.
Check the contactor functions.
Replace the contactor.
LVD 2 Contactor Failure
(LVD 2 Failure)
LVD2 contactor has failed.
LargeDU LVD Alarms (Large Distribution Unit must be present in system)
(LargeDU LVD)
LVD1 Disconnected
(LVD1 Disconnect)
LVD1 contactor is in disconnect mode.
--
LVD2 Disconnected
(LVD2 Disconnect)
LVD2 contactor is in disconnect mode.
--
Rectifier AC Alarms
(Rectifier AC)
Line AB Over Voltage 1
(L-AB Over Volt1)
Voltage between Line A and Line B is
higher than the High Line Voltage AB
Alarm threshold.
Check why voltage is high.
Line AB Over Voltage 2
(L-AB Over Volt2)
Voltage between Line A and Line B is
higher than the Very High Line Voltage
AB Alarm threshold.
Line AB Under Voltage 1
(L-AB UnderVolt1)
Voltage between Line A and Line B is
lower than the Low Line Voltage AB
Alarm threshold.
Check why voltage is low.
Line AB Under Voltage 2
(L-AB UnderVolt2)
Voltage between Line A and Line B is
lower than the Very Low Line Voltage
AB Alarm threshold.
Line BC Over Voltage 1
(L-BC Over Volt1)
Voltage between Line B and Line C is
higher than the High Line Voltage BC
Alarm threshold.
Check why voltage is high.
Line BC Over Voltage 2
(L-BC Over Volt2)
Voltage between Line B and Line C is
higher than the Very High Line Voltage
BC Alarm threshold.
Line BC Under Voltage 1
(L-BC UnderVolt1)
Voltage between Line B and Line C is
lower than the Low Line Voltage BC
Alarm threshold.
Check why voltage is low.
Line BC Under Voltage 2
(L-BC UnderVolt2)
Voltage between Line B and Line C is
lower than the Very Low Line Voltage
BC Alarm threshold.