Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 63)

Chapter 7
Installation
7-2
ATTENTION: The installation of the drive must be planned
such that all cutting, drilling, tapping and welding can be
accomplished with the drive removed from the enclosure. The
drive 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.
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