Applied Motion 2035XD - Manual (Page 4)

-4-
Introduction
Thank you for selecting an Applied Motion Products motor control. We hope our
dedication to performance, quality and economy will make your motion control
project successful.
If there's anything we can do to improve our products or help you use them better,
please call or fax. We'd like to hear from you. Our phone number is (800) 525-
1609 or you can reach us by fax at (831) 761-6544.
Features
• Two axis step motor driver in one compact package
• Drives sizes 11 through 23 step motors
• Pulse width modulation, 3 state switching amplifiers
• Phase current from 0.1 to 2.0 amps (set by software)
• Optically isolated, differential step/run, direction inputs
• 0 to 5 volt analog inputs for speed control
• 15 step resolutions, 200 - 50800 steps/rev (set by software)
• Automatic idle current reduction (set by software)
Block Diagram
(each axis)
Optical
Isolation
step+
V+
V-
step-
A+
A-
B+
B-
dir+
dir-
OUT+
OUT-
+5V
analog in
GND
RS-232
eeprom
PWM
Amplifier
connections to indexer,
controller or other devices
connections
to
motor
connection to PC
for programming
connect to
power supply
(12-35 VDC)
x
Controller
-13-
Choosing a Power Supply
Voltage Voltage Voltage Voltage Voltage
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 at
least five times that of the motor. Depending on how fast you want to run the
motor, you may need even more voltage. More is better, the only upper limit being
the maximum voltage rating of the drive itself: 35 volts (including ripple).
If you choose an unregulated power supply, make sure that the no load voltage
does not exceed 35 volts DC. If the no load voltage is not specified, apply power to
the supply without connecting the 2035XD and measure the voltage.
Current
Current Current Current 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 2035XD uses 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 estab-
lished. 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.
The PS430 from Applied Motion Products is a good supply to use with The PS430 from Applied Motion Products is a good supply to use with The PS430 from Applied Motion Products is a good supply to use with The PS430 from Applied Motion Products is a good supply to use with The PS430 from Applied Motion Products is a good supply to use with
the 2035XD. the 2035XD. the 2035XD. the 2035XD. the 2035XD.