Application Guide

System Application Guide SAG582140001
Spec. No. 582140001 (Model 801
NLDB, 801NLEB, 801NL-B) Issue AN, June 4, 2014
Page 95 of 115
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(D) Method 4 (External Test/Equalize): A user (or external equipment) places the
system into the test/equalize mode by applying an external signal to the system.
The system returns to the float mode when the external signal is removed. This method
overrides the other three methods.
5.4.5 Input Protection: Lists 1 and 9 provide connections for twenty-four (24) AC input branch
circuits (one per Rectifier Module mounting position). Lists 2 and 10 provide connections for
two (2) AC input branch circuits (two per Power Bay). Customer to provide AC input branch
circuit protection.
(A) Input Over/Under Voltage Protection: The Rectifier Module shuts down and its protection
indicator (yellow) illuminates when the input voltage is lower than 260VAC or higher than
530VAC. This condition is reported to the power system controller and the power system
controller processes the alarms accordingly.
(B) Input Fusing: Input fusing is provided in each Rectifier Module. This fusing is not customer
replaceable.
5.4.6 Output Protection
(A) Current Limiting: The maximum current delivered by the system can be programmed from
10% to 110% of total system capacity. The MCA automatically adjusts the current limit
circuit on each Rectifier Module so that this value is not exceeded. If a Rectifier Module
fails, the MCA automatically resets each remaining Rectifier Module's current limit point to
maintain this value. The MCA also insures that the current limit circuit on any Rectifier
Module is not set above 110% of its capacity. The default current limit setting is the sum of
each installed Rectifier Module's output rating. If an additional Rectifier Module is added to
the system, the system current limit is automatically increased by the rating of the new
Rectifier Module and the new current limit value is displayed.
The current limiting point can be adjusted without removing a Rectifier Module. One
adjustment changes the setting of all Rectifier Modules.
The current limit is factory set at 100% of rated full load, unless otherwise specified.
(B) Output Fusing: Output fusing is provided in each Rectifier Module. If a fuse opens, local
and remote Rectifier Module Fail Alarms activate. This fusing is not customer replaceable.
(C) High Voltage Shutdown
(1) Internal: If Rectifier Module output voltage exceeds an adjustable preset value, the
Rectifier Module shuts down.
After approximately 5 seconds, the Rectifier Module automatically restarts. If Rectifier
Module output voltage again exceeds the high voltage shutdown value within 5 minutes,
the Rectifier Module shuts down and locks out. Manual restart is then required. If the
Rectifier Module does not experience a high voltage condition within the 5 minute time
period, the restart circuit is reset.
If two or more Rectifier Modules are installed in the Power Bay, or if the Power Bay is
paralleled with other Power Bays, only the Rectifier Module causing the high voltage
condition shuts down.
The high voltage shutdown point can be checked and/or adjusted without removing a
Rectifier Module. One adjustment changes the setting of all Rectifier Modules.
Adjustable from 56.0 to 59.0 volts DC. Factory set at 57.50 volts, unless otherwise
specified.
(2) Remote: See Paragraph 4.1.14 (B).
(3) Backup: If Rectifier Module output voltage exceeds a second (non-adjustable) value,
the Rectifier Module shuts down and locks out regardless of load. Manual restart is
then required. The fixed hardware HVSD is 59.5V (within the range of 58.5 to 60V).
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