COMEUP DHC Hoist (Ver:03) - Manual (Page 11)

9
D/d Ratio
The drum diameter to wire rope diameter ratio (D/d) determines the wire rope size required.
Minimum hoist drum root diameter = wire rope diameter x ANSI B30.5* ratio minus rope diameter.
The greater the ratio the longer the wire rope life.
* In compliance with standard of ANSI B 30.5, the rope safety factory shall maintain at least 18:1
Rope Safety Factor
The working coefficient shall be determined from the ratio of the minimum breaking force of
the rope and the maximum possible lifting force.
* In compliance with standard of ANSI B 30.5, the rope safety factory shall maintain at least 3.5:1
Standard compliance of EC Directives
The EC directive includes the following individual directives
• Machinery Directive 2006/42/EC
It applies to independently functional machinery or the interlinking machines to form entire
systems. The complete machine and plant must always fulfill the directive.
• Electromagnetic Compatibility Directive (EMC) 2004/108/EC
It applies to most electrical and electronic apparatus, that is, finished products and systems
that include electrical and electronic equipment to ensure that the electromagnetic disturbance
generated by apparatus does not exceed a level allowing radio and telecommunications equipment
and other apparatus to operate as intended, and that apparatus has an adequate level of intrinsic
immunity to electromagnetic disturbance to enable it to operate as intended.