Operation
Multiple Supplies
Release 2.2
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Parallel
Operation
Parallel operation is used to obtain a higher current single output supply using two
or more single units. Set all of the outputs to the same voltage before connecting the
positive terminals (+) and negative terminals (-) in parallel. The total current
available is the sum of the maximum currents of each supply.
Sensing for Parallel Operation
Use default local sensing to enhance power
sharing between units, as the impedance of the load lines will tend to correct for
current imbalance. If you use remote sensing at the load for better voltage regulation,
one supply always operates in current limit mode and supplies most of the power.
OVP for Parallel Operation
If you should have a problem with external transients tripping the OVP circuit, you
have two solutions. One is to add a diode in series with the output line or the return
line. This diode must have a reverse voltage and current rating greater than the power
supply output. The second solution is to disable the OVP circuit by removing resistor
R93 from the A2 PCB.
Split Supply
Operation
Split supply operation is used to obtain two positive voltages with a common ground,
or a positive-negative supply.
To obtain
two
positive voltages
, connect the negative terminals of both supplies
together. The positive terminals will supply the required voltages with respect to the
common connection.
To obtain a
positive-negative supply
, connect the negative terminal of one supply
to the positive terminal of the second supply. The positive terminal of the first supply
then provides a positive voltage relative to the common connection while the
negative terminal of the second supply provides a negative voltage. The current
limits can be set independently. The maximum current available in split operation is
equal to the rated output of the supplies used.
!
CAUTION
To prevent internal damage, ensure that the OVP trip level of all supplies is set to
maximum.
!
CAUTION
Disabling the OVP circuit will not allow for protection of the load in the event of a
remote programming error, incorrect voltage control adjustment, or power supply
failure.
