Rockwell Automation 1391ES AC Servo Controller - Manual (Page 41)

Installation
Chapter 6
6-39
ATTENTION: The installation of the controller must be
planned such that all cutting, drilling, tapping and welding can
be accomplished with the controller removed from the
enclosure. The controller is of the open type construction and
any metal debris must be kept from falling into it. Metal debris
or other foreign matter may become lodged in the circuitry
resulting in component damage.
!
Wiring Recommendations General Information
The information supplied in this manual on wire sizes, practices, layouts,
system configurations and grounding/shielding techniques for the
1391B-ES Servo Controller are presented as guidelines. Due to the
diversity of applications and systems, no single method of wiring is
completely applicable.
Important: This information represents common PWM servo system
wiring configurations, size and practices that have proven satisfactory in a
majority of applications. The National Electrical Code, local electrical
codes, special operating temperatures, duty cycles or system configurations
will take precedence over the values and methods listed.
Wire Sizes
Unless noted, the wire sizes in this manual are recommended minimums
and assume type MTW wire (machine tool wire, 75
°
C, minimum) per
NFPA 79. Since ambient conditions vary widely, on certain applications, a
derating factor has to be taken into account. Also, wiring to controllers or
motors exceeding 50 feet (15.2 meters) in length (total includes to and
from device) may cause excessive voltage drops. Consult the National
Electrical Code for factors on ambient conditions, length etc. or the
Allen-Bradley Sales Representative in your area for further information.
Shielding
Reasonable care must be taken when connecting and routing power and
signal wiring on a machine or system. Radiated noise from nearby relays
(relay coils should have surge suppressors), transformers, other electronic
drives, etc. may be induced into the velocity command signal lines causing
undesired movement of the servomotor.