12
2.7
Enabling Load Sharing
All A75D(E)
units include the Load Sharing feature. Load sharing allows the customer to parallel with any
identical A75D(E) to share a DC load and therefore reduce the strain on each charger. Chargers to be
paralleled
MUST
be the same output.
Load Sharing Procedure
Before making any connections to the A75D(E) ensure that the AC Power is off at the main breaker box and
that both of the units’ breakers are off. Verify that no voltage is present by using a voltmeter at all input and
output terminals.
1.
Connect the DC Output of both units in parallel to the same DC load/battery.
2.
Connect the
LS
terminal of one charger to the
LS
terminal of the second charger.
3.
Once batteries are fully charged and/or loads are stabilized, turn OFF all chargers except for one.
4.
Take a voltage reading on the output of the charger.
5.
Turn on the next charger, turn off the first charger.
6.
Set the output voltage of the second unit to match the first by adjusting the float potentiometer.
7.
After all chargers have been adjusted, turn ON all chargers
8.
Follow the same procedure for setting the equalize voltage.
Figure 11 - Load Sharing Connections
2.7.1 Remote Equalize Terminal (Option 57R)
Chargers that are set up for Load Sharing, must be set to the same charging mode to operate properly. All
connected chargers must switch into (and out of) equalize mode at the same time. It is recommended that
when load sharing is used, that the equalize mode be set to
Mode 0
(Manual Equalize).
With Option 57R, the A75DE chargers can will automatically change charging modes together. If one charger is
placed into equalize mode, all other connected chargers will automatically change to equalize mode.
Load Sharing Procedure (with Remote Equalize)
Before making any connections to the A75D(E) ensure that the AC Power is off at the main breaker box and
that both of the units’ breakers are off. Verify that no voltage is present by using a voltmeter at all input and
output terminals.
1.
Connect the DC Output of both units in parallel to the same DC load/battery.
2.
Connect the
LS
terminal of one charger to the
LS
terminal of the second charger.
3.
Connect the
RE
terminal of one charger to the
RE
terminal of the second charger.
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.
6.
Turn on the next charger, turn off the first charger.
7.
Set the output voltage of the second unit to match the first by adjusting the float potentiometer.
8.
After all chargers have been adjusted, turn ON all chargers
9.
Follow the same procedure for setting the equalize voltage.
