Alpha Technologies Cordex Controller Ver.3.1x - Manual (Page 29)

27 0700015-J0 Rev B
The BT depth of discharge (DOD) can be accessed via the Analog Signals Display; provides an addi-
tional indication of test progress.
BT information is available via the CXC battery log web page when a test is in progress. In addition, the
new battery capacity estimate can be accessed via the Analog Signals display at any time before, during
or after the test.
4.12.3 BT Initiation
When the test begins, an entry is made in the event log. If enabled, an alarm provides a warning to indi-
cate that a Battery Test is in progress.
The test will continue, depending on the type of rectifier in use, in accordance with the following algo-
rithms (as applied to lead acid batteries):
Algorithm 1
— For rectifiers that support Battery Test (BT) mode:
1. A command is sent to put the rectifiers into BT mode.
2. BT mode runs for the period set as Timeout or until BT End Voltage is reached.
Algorithm 2
— For (Pathfinder) rectifiers that do not support BT mode:
1. Rectifiers are commanded to go to nominal voltage.
2. The rectifiers are periodically scanned to be sure that they do not begin sourcing current. When 3%
DOD is reached and the rectifiers are still not sourcing current, the rectifiers are turned off.
3. The rectifier float setting is reset to the setting stored in the system controller.
4. When the system voltage reaches the end (termination) voltage or a timeout occurs, the system
controller will command the rectifiers to turn ON and enter FL mode.
4.12.4 Activity During BT Mode
Temp Comp and Power Save features are suspended during a battery test.
When the battery is discharging, a BOD alarm is active.
During a test, the mode symbol in the upper left corner of the GUI updates to “BT.”
Runtime estimate begins at 3% DOD.
Capacity estimate also begins at 3% DOD, but is not stored unless DOD > 20%; the point at which rea-
sonable accuracy can be assured.
4.12.5 AC Failure During BT Mode
If the AC fails during a battery test, the test will be aborted. This will place the rectifiers into a state that
will enable them to resume providing power to the load when AC returns. If the Runtime is being dis-
played, it will continue to update.
4.12.6 Addition of Rectifiers During BT Mode
If rectifiers are added to the system when a battery test is active, they will be placed into the same state
as the other rectifiers. They are:
• Placed into BT mode (for rectifiers that support BT mode), or
• Placed into remote shutdown, or
• Set to the same voltage as the other rectifiers.