B&K Precision 1747 - Manual User Manual
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Current equalizing resistors must be used as shown in
. However, the
protective current limiting feature will prevent damage if current is temporarily
unbalanced during set-up.
When connected in parallel and operating in the constant voltage mode,
determine the total load current limit and preset the current limiting for each
power supply to half the total load current value. Then when the load is
connected, set the voltage controls on the two power supplies for equal voltage
readings. This should also provide approximately equal current from each supply.
Add the two current meter readings together for total load current, or connect
an external ammeter in series with the load.
Figure 9 - Connecting Two Power Supplies in Parallel
If the current equalizing resistors are not well matched, it is preferable that the
voltages be slightly unbalanced to achieve current balance. Be sure that the
supplies are adequately balanced so that both remain in the CV mode.
When connected in parallel and operating in the constant current mode, the
voltage controls of both supplies should be preset to the same value. Then when
the load is connected, the current controls of the two supplies should be
adjusted for approximately equal current from each unit. Be sure that both
supplies remain in the CC mode.