
9
Percentage Duty Cycle
WARNING
Never hoist over the rated percentage duty cycle.
The life of the hoist is depending on the conditions of the load and working frequency.
In the long time operation, make sure to use the machine within its %ED ratings.
Tb
Percentage duty cycle (%ED)=------------------ X 100 (%)
Tb+Ts
Tb: total sum of overall loadings operating hours.
Ts: total sum of stopping hours.
Tb + Ts = approximately 1 to 10 minutes.
The duty cycle of heavy duty hoist varies according to the rated lifting.
Rated lifting
kg / lb
GTD-650
min / 10 min
GTD-800
min / 10 min
GTD-1200
min / 10 min
GTD-2200
min / 10 min
GTD-2800
min / 10 min
12V
24V
12V 24V 12V 24V
12V 24V 12V 24V
No load 3.0 3.0 2.5 Cont. Cont.
147 / 320 2.0 -2.3 ----
181 / 400 -2.0 -Cont. 8.0 --
227 / 500 -----9.0 7.0
272 / 600 1.5 -2.0 ----
362 / 800 -1.5 -8.0 6.0 --
408 / 900 --1.8 ----
454 /1000 -----7.0 4.5
544 / 1,200 --1.5
6.0 4.0 --
771 / 1,700 4.5 3.0 5.0 3.0
998 / 2,200 ---3.0 2.0 3.5 2.5
1,270 / 2,800 -----2.5 2.0
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
10
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.
Extracts from the EC Directive & Comeup compliance:
1. EN 14492-1 Section 5.15.6 Wire Rope
Wire rope minimum break to be twice hoist rating
2. EN 14492-1 Section 5.7.2 Rope Drum
Rope drum mean diameter to be 10 times the diameter of the wire rope
3. EN 14492-1 Section 5.7.6 Rope Fastening onto the rope drum
Rope attachment to withstand 2.5 times the hoist rating
Rope must have at least two wraps winding before fixing point
4. EN 14492-1 Section 5.15.5 Brake
Hoist to hold full rated load
5. EN 14492-1 Section 5.15.2 Rated Capacity Limiters
The thermal overload cutout limit the driving power of the motor prevents hoist overloading
To comply with EN 14492-1, the following optional accessories must be fitted to all hoists
‧Overload protection device ‧Rope drum cover
‧Emergencystopkit ‧Battery isolator switch
‧Up and Down limits protection device
When using and installing a hoist, the owner or end user shall ensure that all legal
requirements are completely complied with.