Applied Motion Si5580 - Manual (Page 17)

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Microstepping
Most step motor drives offer a choice between full step and half step resolutions. In full step mode,
both motor phases are used all the time. Half stepping divides each step into two smaller steps by
alternating between both phases on and one phase on.
Microstepping drives like the Si5580 precisely control the amount of current in each phase at each
step position as a means of electronically subdividing the steps even further. The Si5580 offers a
choice of 13 step resolutions. The highest setting divides each full step into 254 microsteps, provid-
ing 50,800 steps per revolution when using a 1.8
°
motor.
In addition to providing precise positioning and smooth motion, microstep drives can be used for
motion conversion between different units. The 25,400 step/rev setting is provded as a means of
converting motion from metric to english (there are 25.4 mm in an inch). Other settings provide step
angles that are decimal degrees (36,000 steps/rev makes the motor take 0.01
°
steps). Some settings
are used with lead screws. When the drive is set to 2000 steps/rev and used with a 0.2 pitch lead
screw, you get 0.0001 inches/step.
The microstep resolution of the Si5580 is set by the Si Programmer TM software.
Alarm Codes
In the event of an error, the red and green LEDs will flash in alternating red-green patterns as shown
below. The pattern repeats until the alarm is cleared.
CODE: ERROR:
2 red, 1 green CCW Limit
2 red, 2 green CW Limit
1 red, 3 green subroutine stack overflow
2 red, 3 green subroutine stack underflow
4 red, 3 green bad instruction in Si program (memory or software)
7 red, 1 green serial communication error