Specifications
SECTION 3 STEP MOTOR DRIVER
16
ADJUSTING THE RUNNING CURRENT
The output current on the Microstep Driver Pack (DPD60401) is set
by the Running Current Potentiometer. This resistance determines
the per Phase RMS output current of the driver. Refer to table on
Running Current Settings.
REDUCING OUTPUT CURRENT
The amount of current per Phase in the reduction mode is related to
the value of the current adjustment potentiometer (Running Current)
and the current reduction potentiometer (Reduced Current). When
the current reduction circuit is activated, the Reduced Current
resistance is paralleled with the Running Current resistance. This
lowers the total resistance value, and thus lowers the per Phase
output current by a percentage.
Pot 1.4 AMPS 2 AMPS 3 AMPS 4 AMPS 5 AMPS 5.5 AMPS
1 50% 42% 32% 26% 22% 21%
2 61% 53% 43% 36% 31% 30%
3 70% 64% 54% 46% 41% 39%
4 75% 70% 61% 54% 48% 46%
5 80% 75% 67% 59% 54% 52%
6 82% 78% 71% 64% 58% 56%
7 84% 81% 75% 68% 63% 61%
8 86% 84% 77% 71% 66% 64%
9 89% 88% 83% 78% 74% 72%
TABLE : Percentage of I(peak) settings on Reduced Current Potentiometer
Note: To obtain a proper setting, adjust the potentiometer arrow to the setting that corresponds to the rated
current of the step motor in use. Use the resistance tables that match resistance to rated motor currents.
MOTOR DRIVER CONNECTIONS
Wiring from the Driver Pack to the motor should be routed away from all other wiring. All electrical
connections are made to screw-type terminals for secure and reliable connections. Refer to Section 5,
Installation.
STEP MOTOR CONFIGURATIONS
Step motors can be purchased in configurations of 4, 6 or 8 leads. Each configuration requires different
current settings. Different lead configurations and the procedures to determine their output current are
shown below .
6 Lead Motors
When configuring a 6 lead motor in a half-coil
configuration (connected from one end of the coil to
the center tap) use the specified per Phase (or unipolar)
current rating to determine the current adjustment pot
setting. This configuration will provide more torque at
higher speeds.
Running Current
Potentiometer Setting
Current
(Amps)
1 1.4
2 2
3 3
4 4
4 4.5
5 5
5.5 5.5