NI ISM-7413 Ethernet Integrated Stepper User Manual
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© National Instruments
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21
Figure 26.
Delay Due to Filtering
Input Noise Filter
Electrical noise can negatively affect the STEP signal by causing the drive to interpret one
step pulse as two or more pulses. This results in extra motion and inaccurate motor and load
positioning. To solve this problem, the NI ISM-7413 includes a digital noise filter on the STEP
and DIR inputs. The default factory setting of this filter is 7.5 MHz, which is suitable for most
applications.
Your maximum pulse rate equals the highest motor speed multiplied by the number of steps per
revolution. For example:
Consider the maximum pulse rate when deciding whether you must increase the filter frequency.
EN Input
You can configure the behavior of the EN input. Common applications use EN as a relay to turn
the device on and off, or to clear fauls.
Programma
b
le Output
The programmable digital output can be used as an indicator to alert you to faults or to control
a brake. It can also be used as a tachometer to report every rotation.
Self Test
If you are having trouble getting your motor to turn, use the built-in self test from the NI Stepper
Configuration Utility home page. Select the
Drive
menu item and choose
Self Test
. Use this
feature to confirm that the motor is wired correctly, selected, and otherwise operational.
S
econd
s
Re
v
/
S
ec
12
10
8
6
4
2
0
–2
–4
0
0.1
0.2
0.
3
0.4
0.5
0.6
0.7
0.
8
0.9
ON
OFF
40
revs
ond
sec
------------------
20 000
steps
revs
-------------
,
×
800
kHz
=
Summary of Contents for ISM-7413
Page 1: ...ISM 7413...
