Application Guide
SAG582140001 System Application Guide
Issue AN, June 4, 2014 Spec. No. 582140001 (Model 801
NLDB, 801NLEB, 801NL-B)
Page 94 of 115
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5.4 Standard Features
5.4.1 Type of Power Conversion Circuit: High frequency.
5.4.2 Float Charging Output Mode: In this mode of operation, system output voltage is constant and
output current does not exceed the current limit setting. During normal operation, the battery is
not required to furnish load current and remains in a fully charged condition.
The float voltage setting can be checked and/or adjusted without removing a Rectifier Module or
affecting the load. One adjustment changes the output of all Rectifier Modules.
Note: If the current demanded by the load exceeds the current limit setting of the system, the
battery is required to furnish the difference in load current and begins discharging.
Note: If the system is used with a digital battery charge temperature compensation probe, the
MCA automatically adjusts system output. This ensures proper voltage to the battery as
battery ambient temperature fluctuates.
5.4.3 Test/Equalize Charging Output Mode: This mode of operation is used if higher output voltage
is required for equalizing the charge on all battery cells of a conventional flooded cell battery, or
for recharging the battery following a commercial power failure.
If the installation site does not require system equalize mode of operation, the equalize feature
can be used as a test feature. System equalize voltage can be adjusted to a test voltage value.
Placing the system into the test/equalize mode causes system output voltage to increase or
decrease to this test voltage value.
The test/equalize voltage setting can be checked and/or adjusted without removing a Rectifier
Module or affecting the load. One adjustment changes the output of all Rectifier Modules.
Note: If the system is used with a battery charge temperature compensation probe, typical
equalize mode of operation is not used.
5.4.4 Output Mode of Operation Selection: There are four methods of placing the system from the
float mode to the test/equalize mode.
(A) Method 1 (Manual Test/Equalize): A user manually places the system into the
test/equalize mode via the MCA interface. A user must manually return the system to the
float mode via the MCA interface.
(B) Method 2 (Manually Initiated Timed Test/Equalize): A user manually places the system
into the test/equalize mode via the MCA interface. The system automatically returns to the
float mode after a preset programmable time period (1-99 hours, in increments of one hour).
(C) Method 3 (Automatic Test/Equalize):
THE AUTOMATIC EQUALIZE FEATURE IS INTENDED FOR USE ONLY WITH WET
CELL BATTERIES. USING THIS FEATURE WITH VALVE REGULATED BATTERIES IS
NOT RECOMMENDED.
This feature can be enabled or disabled by a user via the MCA. The default state is
disabled.
The Automatic Equalize feature is a time based function that is controlled by a customer
selectable multiplier and by the Battery on Discharge (BOD) alarm setpoint. The MCA’s
default setting is for a multiplier of zero, which disables the Automatic Equalize feature.
When the Automatic Equalize feature is enabled, if system voltage drops to less than the
BOD alarm setpoint, the MCA initiates a timing cycle to measure the discharge time period.
The MCA requires at least 15 minutes of continuous BOD alarm in order to prevent
nuisance equalization cycles. When system voltage rises to above the BOD alarm
setpoint, the MCA ends the discharge timing cycle and (assuming a minimum of 15
minutes has elapsed) places the Rectifier Modules into the equalize mode for a customer
selectable multiple of the discharge time period (the discharge time period includes the
initial 15 minutes).
The equalize time period can be set for 0 to 15 times the discharge time period, up to a
maximum of 300 hours. A zero (0) setting disables the feature.
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