Applied-motion 2035 User Manual download pdf (Page 4)

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Choosing a Power Supply

Voltage

Current

The maximum supply current you will need is the sum of the two phase

currents. However, you will generally need a lot less than that, depending on the

motor type, voltage speed and load conditions. That's because the 2035 and 2035

O use switching amplifiers, converting a high voltage and low current into lower

voltage and higher current. The more the power supply voltage exceeds the motor

voltage, the less current you’ll need from the power 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

the rated phase current of the motor.

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. This will tell you how much current you really

need so you can design in a lower cost power supply.

If you plan to use a regulated power supply you may encounter a problem with

current foldback. When you first power up your drive, the full current of both motor

phases will be drawn for a few milliseconds while the stator field is being

established. After that the amplifiers start chopping and much less current is drawn

from the power supply. If your power supply thinks this initial surge is a short

circuit it may “foldback” to a lower voltage. With many foldback schemes the

voltage returns to normal only after the first motor step and is fine thereafter. In that

sense, unregulated power supplies are better. They are also less expensive.

Chopper drives work by switching the voltage to the motor terminals on and off

while monitoring current to achieve a precise level of phase current. To do this

efficiently and silently, you’ll want to have a power supply with a voltage rating

atleast five times that of the motor. Depending on how fast you want to run the

motor, you may need even more voltage than that. More is better, the only upper

limit being the maximum voltage rating of the drive itself: 35 volts. If you choose

an unregulated power supply, do not exceed 24 volts. This is because unregulated

supplies are rated at full load current. At lesser loads, like when the motor’s not

moving, the actual voltage can be up to 1.4 times the rated voltage.

logic

connector

STEP, DIR, EN

trimpots for adjusting

LED - indicates

DC power

oscillator speed, accel and

decel rates

(2035 O only)

mounting

hole (1 of 6)

power

connector

motor

connector

jumper for selecting

oscillator mode

(2035 O only)

Getting Started

a 12-35 volt DC power supply for the motor. Please read the section entitled

Choosing a Power Supply

for help in choosing the right power supply.

5 to 24 volts DC, to activate the optoisolation circuits (if you are using an

drive and don't have 5 - 24V available, see page 12.)

a source of step pulses capable of sinking at least 5 mA

if your application calls for bidirectional rotation, you'll also need a direction

signal, capable of sinking 5 mA

a compatible step motor (see page 14)

a small flat blade screwdriver for tightening the connectors and adjusting the

oscillator

•

To use your Applied Motion Products motor control, you will need the following:

The sketch below shows where to find the important connection and adjustment

points. Please examine it now.

switches for

selecting current,

idle current,

full or half stepping,

speed pot (2035 O)

connector for external

speed pot/signal

& tach output

(2035 O only)

1 2 3 4 5 6 7 8

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Applied-motion 2035 User Manual Page 4

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