G
ENERAL
I
NSTALLATION
G
UIDELINES
Networked Indexer/Driver User Manual
ADVANCED MICRO CONTROLS INC.
92
Surge (EMI) Suppression (continued)
Inductive Loads
All inductive devices in the system, such as AC and DC motors, motor starters, contactors,
relays and solenoids, must have surge suppression devices installed across their coils.
Because the Networked Driver is responsible for commutating the stepper motor, surge sup-
pressors cannot be installed at the motor connector. The best way to avoid noise issues when
using a stepper motor is proper cable installation. Keep the motor wires as short as possible.
Consider twisting the winding pairs together to minimize radiated noise. Use shielded cable if
you must extend the cable and tie the shield to earth ground at the Networked Driver motor
connector only.
System Environment
When designing the physical layout of your system it is important to review the environment your control
system will be placed in. This should include reviews of both the physical and electrical environments.
Check the quality of the AC power that will feed the machine.
Check for adequate surge suppression on machines that will be near your new system.
A review of the electrical environment includes checking the quality of the AC power that will feed your new
system as well as checking the quality of the point where your system will be connected to the building's
Grounding Electrode System.
When checking the quality of the AC power for your system, be sure to check every machine that may be
powered by the same feeder circuit. It is in AMCI's experience that nuisance faults can be caused by another
system on the same feeder circuit that does not have adequate surge suppression devices.
System Layout Considerations
The first step to achieving a clean system layout is classifying the wires and cables used in your system based
on the amount of power they carry. Refer to the following table to help you categorize your wires and cables.
Table R8.1 Conductor Categories
Wiring Categories for the SD17060E2 or SD31045E2
AC Power Input: Class 1 (AC power line)
DC Input cables (also included encoder cabling): Class 2 (Low power digital DC input line)
DC output cable: Class 2 (Low Power digital DC output line)
Motor Outputs: Class 1 (High Power DC outputs)
Category
Description
Examples
1
Control and AC Power -
High power conductors
that are more tolerant of electrical noise but
are also more likely to carry electrical noise
than the other categories.
Corresponds to IEEE levels 3 & 4
AC power lines
High power digital AC I/O lines
High power digital DC I/O lines
High power I/O lines typically connect to
devices such as mechanical switches,
relays, and solenoids. Stepper Motor
wiring also falls into this category.
2
Signal and Communication -
Low power conduc-
tors that are less tolerant of electrical noise but
are also less likely to carry electrical noise
than category 1.
Corresponds to IEEE levels 1 & 2
Analog I/O lines
Low power digital AC I/O lines
Low power digital DC I/O lines
Ethernet or other Communications Cables
Low power I/O lines typically connect to
devices such as proximity switches,
photo sensors, and encoders.
3
Intra-enclosure -
Similar characteristics to cate-
gory 2 conductors, these conductors intercon-
nect system components within an enclosure.
Low voltage DC power cables
Communications Cables
