Applied Motion 7080 - Manual (Page 4)

connector
STEP
DIRECTION
ENABLE
FAULT
mounting
hole (1 of 6)
power
connector
motor
connector
Getting Started
a 18-80 volt DC power supply for the motor. Please read the section entitled
Choosing a Power Supply for help in choosing the right power supply.
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
a small flat blade screwdriver (3/32" or 2.5 mm) for tightening the connectors
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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.
-13-
overcurrent
indicator
(yellow LED)
overtemperature
indicator
(yellow LED)
power indicator
(red LED)
Choosing a Power Supply
We recommend using an Applied Motion Products power supply with this drive.
Two models are available: the PS430 (30 volts DC at 4 amps) and the PS1050 (50
volts DC at 10 amps). The PS430 can also provide 500 mA of well regulated 5 volt
power for your logic circuits. If you do not choose an A.M.P. supply, please follow
the recommendations below.
Voltage
Chopper drives like the 7080 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 than that. If you choose an
unregulated power supply, do not exceed 48 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. For smooth,
quiet operation, a lower voltage is better.
Current
The maximum supply current you could ever 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 7080 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. 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 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 fold back. 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 “fold back” to a lower voltage.
Because of that, unregulated power supplies are better. They are also less
expensive.
switches for
selecting
microstep
resolution
Always use the blue & white Applied
Motion screwdriver with this
connector. Larger screwdrivers may
remove the plastic dimples that
prevent the screws from falling out.