Applied-motion STR2 Manual do Utilizador descarregar pdf (Página 10)

STR2 Hardware Manual

920-0059B

1/30/2014

Choosing a Power Supply

When choosing a power supply, there are many things to consider. If you are manufacturing

equipment that will be sold to others, you probably want a supply with all the safety agency

approvals. If size and weight are an issue get a switching supply.

And you must decide what size of power supply (in terms of voltage and current) is needed for

your application.

Applied Motion oers three powers supplies that are excellent matches for the STR2 drive:

PS50A24 (24V, 2.1A), PS150A24 (24V, 6.3A) and PS320A48 (48V, 6.7A).

Voltage

Your motor can provide more torque at higher speeds if a higher power supply voltage is used.

Please consult the speed-torque curves later in this manual for guidance.

If you choose an unregulated power supply, make sure the no load voltage of the supply does

not exceed the drive’s maximum input voltage specication.

Current

e maximum supply current you could ever need is two times the motor current. However,

you will generally need a lot less than that, depending on the motor type, voltage, speed and

load conditions. at’s because the STR uses a switching amplier, converting a high voltage

and low current into lower voltage and higher current. e more the power supply voltage ex-

ceeds the motor voltage, the less current you’ll need from the power supply. A motor running

from a 48 volt supply can be expected to draw only half the supply current that it would with a

24 volt supply.

We recommend the following selection procedure:

1. If you plan to use only a few drives, get a power supply with at least twice “per

phase” current rating of the step motor. Example: for a motor that’s rated for 2 A/phase use a 4

A power supply..

2. If you are designing for mass production and must minimize cost, get one power

supply with more than twice the rated current of the motor. Install the motor in the application

and monitor the current coming out of the power supply and into the drive at various motor

loads. is will tell you how much current you really need so you can design in a lower cost

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Applied-motion STR2 Manual do Utilizador Página 10