Instruction manual

3 OPERATION
3.1 CONNECTING THE LOAD
The load can be connected to the front or rear panel of the BOS/S. The front panel
connection is a 5 way binding post and the output at the rear panel is located on TB2
labeled Plus (+) and Minus (-). (See Drawing 02-469-001.)
The load must be connected with wires of the appropriate gauge avoiding excessive
lengths and bundling, reducing reactive components. When possible, twist the load
wires to reduce noise from stray fields.
3.2 REMOTE SENSING
The remote voltage sensing of the BOS/S is done at the front panel. If there are long
load wires which are carrying currents, a potential drop occurs in the wires. To
achieve accurate control of the load voltage, remove the sense jumpers at the front
panel and connect sense wires between the load and plus and minus sense at the rear
or front of the power supply.
NOTE 1:
When using remote sensing, always use twisted pair wires of at least 22 AWG.
If possible, use shielded twisted pair to reduce interference.
NOTE 2:
Certain combinations of R & C at the load can resonate and add additional
feedback phase shift which will cause the internal feedback loop to oscillate.
For example, when the load wires are more than 15 feet long the associated
inductance becomes significant. This inductance could resonate with a 10 to
20µF load bypass capacitor and add an additional phase shift of 90 degrees
which would cause an oscillation. Adding 100µF capacitors at the power supply
between + OUT and +SENSE. -OUT and -SENSE will in most cases, stop any
oscillation and still not deteriorate the transient response (See Figure 3.2.1).
Polarized or non-polarized capacitors may be used. If polarized capacitors are
used, proper polarity must be observed (See Figure 3.2.1).
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83-469-001 Rev. B