EXTERNAL CURRENT SET RESISTOR
An external current set resistor can be used, which will be connected between CN1 PIN 2 (Current Set) and CN1 PIN 3 (GND).
The formula for the current set resistor is below:
R
I
= I
PEAK
x 500
For a 3.2A motor the equation would look like below:
R
I
= 3.2 x 500
R
I
= 1600
This would mean a 1.6K resistor would be the calculated resistance value. If the calculated resistance is a nonstandard value, it
is safe to use the closest 5% resistor that is less than the calculated value. For instance, a 4.6A motor would need a 2.3K
resistor; the nearest 5% value is a 2.2K resistor which would result in roughly 96% of the motor’s rated current (4.4A). The
resistor leads should be kept as short as possible to prevent noise problems.
STEP 3: SELECTING MICROSTEP RESOLUTION
Choosing microstep resolution will determine how many revolutions your motor moves with a given frequency. To calculate
how many pulses per revolution your motor will move you simply calculate the number of full steps per revolution by the
microstep setting. For example, a standard 1.8 degree (200 full steps per revolution) stepper motor with a GR214V set to 25
microstep will require 5,000 pulses per revolution.
The resolution should be set on the DIP switch according to the diagram below.
