Schneider Electric Owner's Guide

Introduction
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Two-Stage Battery Charging
The two-stage charging process includes the bulk and absorption stages only.
There is not a float stage. The relationship between charging current and
battery voltage during the two-stage charging process is shown in Figure 1-3.
No Float State During the no float state the charge controller does not produce any charge
voltage and cannot supply any current. Instead, the charge controller monitors
the battery voltage and transitions back to the bulk stage once the voltage drops
below the recharge voltage setting for one minute.
NOTE
This notice is applicable to Figure 1-2 and Figure 1-3.
• When the charge cycle is interrupted, the charge controller will resume
charging at the beginning of the multi-stage algorithm.
• The exit current threshold mechanism can be disabled by setting the
amp-hour capacity to 0. In this case, absorption will only exit when the
absorption timer expires.
• Charge current during the equalize state (an optional state not shown in the
figures) is normally limited to a maximum of10% of the programmed
amp-hour capacity setting. If this setting is programmed to 0 Ah, the
charge current during equalize is limited to what is programmed for the
maximum current limit of the charge controller (default is 80 A).
• Synchronized charge states are active when more than one charging
device (the charge controller or Conext XW+), is connected in the battery
system and a common Xanbus network.
• The first charging device to enter bulk causes all other Xanbus
connected devices to enter bulk.
• The first charging device to enter absorption causes all other Xanbus
connected devices to enter absorption.
• The last Conext XW+ that is ready to exit absorption triggers all
Xanbus connected devices to exit absorption and enter float.
NOTE
For more information about battery charging settings, see Table 2-1, “Battery
configuration settings” on page 2–4 and Table 2-2, “Custom battery settings”
on page 2–7.
975-0560-01-01(XW-MPPT80-600_Ops).book Page 6 Wednesday, November 22, 2017 5:52 PM