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CENTRIC 3x480, User Guide, rel. 1.7
41
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If a battery test is scheduled to take place now but the battery has not yet been fully charged (has not
yet been charged from the mains for eight consecutive hours since its last significant discharge), the
test is postponed until the battery is fully charged.
7.2.4.1.4
M
AXIMUM DURATION OF BATTERY TEST
Set the maximum time a battery test may continue. If the battery is able to power the load for this time
period without its voltage descending to the "battery low voltage limit", the battery has passed the test.
7.2.4.1.5
N
EXT BATTERY TEST START TIME
Use this function to change/override the start time of the next automatic battery test. The subsequent
battery test interval is counted down from the completion of that test.
7.2.4.1.6
E
NABLE
/D
ISABLE BATTERY TEST BY CURRENT
If you have more than one battery bank and the current sensors are installed, it is possible to compare the
current supplied by each battery bank. If the battery banks do not draw equal currents, then the battery
current test fails when this test is enabled.
7.2.4.2
SETUP > BATTERY > BATTERY CURRENT
The parameters in this section relate to the battery output current.
7.2.4.2.1
E
NABLE
/D
ISABLE CURRENT SENSORS
Use this function to enable or disable the (optional) battery current sensors.
7.2.4.2.2
C
ALIBRATE BATTERY CURRENT
This function is used to calibrate battery current reading for any of the battery strings.
The "Set dc current offset" and "Calibrate battery current" functions should be performed only if the battery
current measurement is not correct. They are used only when current sensors are added to the system.
1
.
Operate the UPS without a load and with batteries disconnected.
2
.
Perform the "Set dc current offset" function (only if the measured current is not zero).
3
.
Connect the UPS to its batteries and to a load and operate the UPS in battery mode.
4
.
Measure the actual battery current and correct the controller reading (if necessary) using the
"calibrate battery current" function. Note: when the system is operating in battery mode, the battery
current value is negative.
7.2.4.2.3
S
ET DC CURRENT OFFSET
The "Set dc current offset" sets the UPS's dc current measurement to relative zero.
The "Set dc current offset" and "Calibrate battery current" functions should be performed only if the battery
current measurement is not correct. They are generally used only when current sensors are added to the
system.
1
.
Operate the UPS without a load and with batteries disconnected.
2
.
Perform the "Set dc current offset" function (only if the measured current is not zero).
3
.
Connect the UPS to its batteries and to a load and operate the UPS in battery mode.
4
.
Measure the actual battery current and correct the controller reading (if necessary) using the
"calibrate battery current" function. Note: when the system is operating in battery mode, the battery
current value is negative.
