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System Application Guide SAG581126000
Spec. No. 581126000 (Model 700
NVBA) Issue AD, November 23, 2009
Page 103 of 123
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.
(N) Low Voltage Disconnect (if LVD installed): Low voltage disconnect is adjustable
from 20.0 to 25.0 volts DC. Reconnect is adjustable from 23.5 to 28.5 volts DC.
The factory disconnect and reconnect settings are as follows, unless otherwise specified.
Power System List No. 10 11 12 13
MCA Configuration No. 534876 534877 534878 534879
Factory Disconnect
Setting (Volts)
21.0 21.7 21.0 21.0
Factory Reconnect
Setting (Volts)
24.5 25.2 24.5 24.5
(O) Audible Alarm Cutoff Reset Feature: Adjustable from 0 to 15 minutes, in one minute
intervals. A zero setting disables the feature. Factory set at 15 minutes, unless otherwise
specified.
(P) Timed Test/Equalize Period (also enables/disables the manually initiated timed
test/equalize feature): Adjustable from 1 to 99 hours, in one hour intervals. When a value
is set, the feature is enabled. You disable the feature by selecting the setting above 99.
Factory set at 1 (one) hour, unless otherwise specified.
(Q) Automatic Test/Equalize Period (also enables/disables the automatic test/equalize
feature): Adjustable from 0 to 15 times the discharge time period, up to a maximum of 300
hours. A zero (0) setting disables the feature. Factory set at zero (0), unless otherwise
specified.
(R) Relay Test Seconds: Adjustable from 5 to 120 seconds, in one second intervals. Factory
set at 45 seconds, unless otherwise specified.
1.3.6 MCA Audible Alarm Cutoff (List 10 and List 11 MCA only): An audible alarm can be
connected to the MCA that sounds when any alarm condition monitored by the MCA occurs.
The alarm can be manually silenced (cut off) by pressing a local pushbutton. A local indicator
illuminates when the audible alarm has been cut off. The alarm remains silenced for the current
alarm condition only. If another alarm condition occurs, the audible alarm again sounds.
A programmable audible alarm cutoff reset feature is provided. Once an audible alarm has been
cut off, it automatically resets (and sounds if the alarm condition is still present) after the time
period programmed expires. If the audible alarm is again cut off while the same alarm condition
is still present, the reset feature is inoperable, and the audible alarm remains silenced. If
another alarm condition occurs, the audible alarm again sounds.
Note: External MCA audible alarm relay contacts are not available if the power system is
equipped with a List 12 or List 13 special application MCA.
1.3.7 Low Voltage Disconnect (if associated components are furnished in a Distribution
Cabinet): Protects the battery from complete discharge. Automatically disconnects the battery
and system output from the controlled load(s) (LVLD) or battery from system and loads (LVBD) if
battery voltage decreases below a preset adjustable value. This can occur during a prolonged
commercial AC power failure, where the battery is required to furnish power to the load, and
subsequently starts to discharge.
For further information, refer to the description of the Low Voltage Disconnect circuit card under
List 21 Features in the List Descriptions section of this document.
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