15
1.7
Enabling Load Sharing
All A77
chargers include the Load Sharing feature. Load sharing allows the customer to parallel with any
identical A77 to share a DC load and therefore reduce the strain on each charger. Chargers to be paralleled
MUST be of the same output. In order to load share properly, at least 10% of the total load capacity must be
applied.
If load sharing is to be used with a battery that requires periodic equalize cycles, the chargers should also
operate in remote equalize mode (See section 1.7.3)
Load sharing only needs to be setup once. Upon recovery from an AC power failure, the chargers will
automatically re-sync the load-share.
Note: Before making any connections to the A77 ensure that the AC Power is off at the main breaker box and
that all of the chargers’ breakers are off. Verify that no voltage is present by using a voltmeter at all input and
output terminals.
1.7.1 Load Sharing Procedure without Batteries/Loads
Preparing for load sharing without loads is easier and should be considered first if possible.
1.
Power up the chargers without anything connected on the output. Adjust the float and equalize output
voltages of each individual charger to same desired level.
2.
Turn off all chargers.
3.
Connect the DC output of all
chargers in parallel to the same DC load/battery.
4.
Connect the
Load Share-Enable
terminal of one charger to the
Load Share-Enable
terminal of the
second charger. Repeat if using more than two chargers. This connection can be made with a 16 AWG wire.
5.
Turn on all chargers.
1.7.2 Load Sharing Procedure with Batteries/Loads
1.
Connect the DC output of all chargers in parallel to the same DC load/battery.
2.
Connect the
Load Share-Enable
terminal of one charger to the
Load Share-Enable
terminal of the
second charger. Repeat if using more than two chargers. This connection can be made with a 16 AWG wire.
3.
Turn on all chargers.
4.
Once batteries are fully charged and/or loads are stabilized, turn OFF all chargers except for one.
5.
Take a voltage reading on the output of the charger and adjust the float output voltage to desired level.
6.
Turn on the next charger, turn off the first charger.
7.
Set the output voltage of the second charger to match the first.
8.
Repeat steps 6 and 7 for the rest of the chargers, if more than two chargers are used.
9.
After all chargers have been adjusted, turn ON all chargers.
Figure 10 - Load Sharing Connection
Connect to Load Share Enable terminal
of identical A77 charger
Содержание A77
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