©
National Instruments Corporation
23
nuDrive Accessory User Guide
located slightly separate from the other two. This is the inhibit status LED
(labeled INH). If a motor does not move when commanded and this LED
is on, check that the nuDrive is enabled via the ENABLE switch, host
interlock and external inhibit inputs, and not in an E-Stop condition.
Stepper Driver Configurations
The stepper nuDrive uses bipolar chopper two-phase microstepping drivers
with a broad range of microstep ratios and current output settings. The
factory-default settings are 10-times microstepping (2,000 steps/rev with
standard 1.8° stepper motors) and current limits set to approximately 1 A
RMS (1.4 A peak) per phase. All microstep drivers in the nuDrive have an
automatic current reduction mode when not stepping to minimize motor
heating. The microstep drivers are factory set to default to 50% of the peak
current value when no stepping has occurred for about 500 ms. Figure 21
shows the location of the P1 and P2 terminal blocks and shows where you
connect the current adjustment resistors on your discrete motion amplifier
board in your nuDrive.
Figure 21.
Stepper Driver Parts Locator Diagram
1
P1
2
P2
SW1
ON
3
2
1
4
5
6
7
8
GND
Current
Adjustment
Resistors
V+
P2
P1
R
CL
R
CR
1
2
3
4
5
6
7
8
1
2
Summary of Contents for nuDrive 2CF-001
Page 32: ......
