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Plant Battery Test
The following is a list of plant battery test parameters that can be configured in the controller. The
result of the Plant Battery Test is available in the Batteries sub-menu of the Status menu.
Manual Test: Permits manually starting a battery discharge test. The test can be set to end on either of
the following two parameters.
• Timed Duration: The duration of the test can be set from 0.1 hours to 99.9 hours and is correlated with a system DC
bus alarm voltage. Test is successful when the voltage is not reached in the time period set.
• 20% of Capacity Algorithm: Utilizes a patented algorithm that places the system on discharge and looks for the
Coup de fouet in the discharge curve and runs the discharge for a time equal to about 20% of the system reserve
capacity and calculates the remainder.
• Amp-Hours Out: The test can be set to end when configured Amp-Hours to be removed has been reached. This test
is also bound by the test duration timed parameter.
Automatic Test: This utility offers the flexibility of running pre-programmed battery tests at specific
times and days, and for specific durations.
• Automatic Test: Select Disabled, 20% of capacity, Timed, or Amp-Hours for the automatic Test Type for the battery
test. The factory default setting is disabled.
• Months Between Test Interval: The test interval (time between tests) can be set from 1 to 18 months in 1 month
increments. The factory default setting is 12 months.
• Test Date for Next Test: Enter a particular day in configured format to automatically run the battery test on that
day.
• Test Start at Hour: Enter a particular time in hh format to automatically run the battery test at that time. The
setting can be configured from 0 to 23 hours. 00:00 is midnight.
• Delay Test Hours After BD: Time interval needed to elapse since the last Battery on Discharge alarm before a
battery test can be performed. This can be set from 0 to 240 hours in 1 hour increments. The factory default setting
is 72 hours.
Recharge Amp Limit: This section contains the settings for battery recharge current limit.
• Limit: Enable or disable battery discharge current limiting.
• Limit To: Current limit setting, from 0.5A to 1000A. The factory default setting is 25A.
During this test, the controller lowers the rectifier voltage to the rectifier voltage during test threshold
or 1.2V (0.6V for 24V systems) higher than highest configured LVD threshold when LVDs are present.
The set-point value of 1.2V plus the highest possible LVD contactor disconnect threshold allows the
controller to enact a safe DC bus voltage as not to accidentally open any of the LVD contactors.
Lowering the rectifier output voltage to rectifier voltage during test threshold or the LVD safe voltage
should create a battery on discharge condition. If the batteries are present and healthy, the plant
voltage will remain above 48V/24V and the batteries will support the load. If the batteries are not
present or are not able to support the load, the plant voltage will immediately drop to approximately
rectifier voltage during test threshold without any consequence to the load. The Battery on Discharge
alarm is masked during this test.
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