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11
Standards and Compliances, continued
SERCOS
Standard
If you want to reference the international SERCOS communications standard, get a
copy of:
International Standard IEC 1491,
Electrical Equipment of Industrial Machines –
Serial Data Link for Real-Time Communication between Controllers and Drives.
SERCOS is an industry standard term that refers to a special type of fiber–optic
communication protocol, as defined by the SERCOS Interface, Inc., promotion
society. (SERCOS
®
interface is a trademark of SERCOS Interface, Inc., promotion
society.)
UL and cUL
Compliance
UL Listed (cUL Certified) drives (Underwriters Laboratories Inc.) comply with the
relevant American and Canadian standards (in this case, UL 840 and UL 508C).
This standard describes the minimum requirements for electrically operated power
conversion equipment (such as frequency converters and drives) and is intended to
eliminate the risk of injury to personnel from electric shock or damage to equipment
from fire. Conformance with the United States and Canadian standard is
determined by an independent UL (cUL) fire inspector through the type testing and
regular checkups.
UL 508C
UL 508C describes the minimum requirements for electrically operated power
conversion equipment (such as frequency converters and drives) and is intended to
eliminate the risk of fire caused by that equipment.
UL 840
UL 840 describes air and insulation creepage spacings for electrical equipment and
printed circuit boards.