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Fusing Inputs
Q: Are external
fuses required on the input of PS5R or PS3L series power
supplies?
A: As there are internal fuses
on the input of these power supplies, an external fuse is
not required. However, the internal fuse is not field
replaceable since it is soldered to a PCB. Therefore use of
an external fuse is often preferred as it can replaced
easily if necessary. Values for internal fuses are listed in
the catalog specifications.
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Linear vs.
Switching Power Supplies
Q: What are the
differences between Linear and Switching (aka Switch Mode)
Power Supplies?
A: IDEC only manufactures only
switching power supplies. Switching power supplies differ
from linear power supplies primarily in how the primary
voltage is tranformed into the output voltage. Switching
power supplies use a high speed switch (power transistor) to
produce a high frequency voltage that is passed through a
relatively small transformer and then filtered to remove the
AC component and noise. Linear power supplies simply pass
the original primary voltage (ie 120VAC/60Hz) directly
through a relatively large transformer and then filter it to
remove the AC component. In general, switching power
supplies are considered superior due to their higher
efficiencies, lighter weight, ability to handle wider input
voltage ranges, and longer hold up times. Linear power
supplies are sometimes less expensive, particularly on
larger wattages. One concern in using a switching power
supply is the high frequency noise (EMI/RFI) that they
produce, but this effect is reduced by adequate filtering.
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Parallel Operation
Q: Can I put
multiple IDEC power supplies in parallel to increase the
total wattage capacity?
A: Yes. Diodes are recommended
on each output to prevent voltage imbalances from feeding
back from one power supply into another. No more than 5
power supplies should be paralleled together. In the PS5R
series, only the 75W, 120W, and 240W models should be
paralleled and only same wattage models should be paralleled
with each other.
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Paralleling
Different Wattage Models
Q: Is it possible
to parallel models of different wattages together?
A: Only models of the same
wattage should be paralleled. Variations in various
specifications can cause problems when paralleling dislike
models. For example rise time, hold up time, input and load
regulation vary depending on model. Such variations can
result in one unit trying to carry the whole load and going
into overload shutdown.
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