Exlar Tritex II DC Series, Инструкция по установке и обслуживанию

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Curtiss-Wright | Tritex II DC Rev. J PN49220 2/8/2016 25
Note: This section does not pertain to an I/O or Holding Brake Power
Supply. The I/O supplies have different limits and it is often inappropriate
to use the same supply for all. See section on I/O Supply.
Power supply sizing for motion is based mainly on maximum
mechanical power delivered to the load, which is force times velocity for
linear or torque times angular velocity for rotary. The power supply has to
provide this power which is rated voltage times maximum current plus
about 20% to cover losses.
Either regulated or unregulated power supplies can be used for the
bus and logic power. Different considerations pertain to each type, and
each has advantages and disadvantages.
Exlar offers a 48V unregulated supply rated at 10 amps continuous
output, TTPS1048 (see Accessories section). It can deliver about 450W
continuous output power. Due to its higher output voltage at light load, it
may be necessary to connect to a higher voltage tap, such as the 132V
tap for 120V operation. This supply requires an external fuse in the AC
input.
Unregulated AC/DC Power Supplies
Tritex II DC operates well from a transformer isolated, unregulated DC
power supply. This type of supply should be sized and connected such
that the maximum output voltage under high-line and light-load
conditions does not exceed the drive maximum voltage rating, 48V
+ 10%. For instance, when using the TTPS1048 power supply, if the line
voltage ever rises above 120V AC, the supply should be connected for
132V AC operation to lower the output voltage by 9%.
Unregulated supplies have the advantage of being able to supply peak
currents without overloading and will not trip on high voltage.
Unregulated supplies have larger capacitance at the output, especially
when compared to regulated switching supplies, providing greater
energy recovery and storage during regen and tolerating high ripple
current. See section on regen for more information on handling energy
from regeneration. They have the disadvantage of output voltage droop
as the current rises.
Unregulated supplies are usually rated only by continuous output
current. For a very short time, not exceeding 1 second, they can typically
output up to 200% of continuous current. Voltage droop may be
significant above continuous voltage rating, which can reduce maximum
speed. One sizing technique is to calculate the required average power
over the worst 5 second interval in a machine cycle, add 20% and use
that to the determine continuous rated output power for an unregulated
supply.
Regulated AC/DC Power Supplies
Most AC/DC power supplies available today are regulated switching
power supplies. They are generally not designed to directly power