O p t i o n s a n d Te c h n i c a l D a t a
D U T Y C L A S S I F I C A T I O N S
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| Operation Time Ratings at K=0.65* | ||||
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| Uniformly Distributed | Infrequent | |||
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| Work Periods | Work Periods | |||
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| Max. ON |
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| Hoist |
| Max. ON | Max. No. | Time From | Max. No. | |
| Duty |
| Time | of | Cold Start | of | |
| Class | Typical Areas of Application | (min/hr) | Starts/hr | (min) | Starts | |
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| H2 | Light machine shop fabricating, service and maintenance; loads | 7.5 | 75 | 15 | 100 |
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| and utilization randomly distributed; rated loads infrequently handled | (12.5%) |
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| H3 | General machine shop fabricating, assembly, storage, and | 15 | 150 | 30 | 200 |
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| warehousing; loads and utilization randomly distributed | (25%) |
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| High volume handling in steel warehouses, machine shops, fabricating | 30 |
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| H4 | plants and mills, and foundries; manual or automatic cycling operations | 300 | 30 | 300 |
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| (50%) |
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| in heat treating and plating; loads at or near rated load frequently handled |
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*K=Mean effective load factor. |
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L I F T I N G M O T O R R A T I N G S |
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Short Time Rating | Intermittent Rating (Percent ED) |
This rating indicates how long the hoist can be operated continuously at the rated capacity on the cycle below, assuming continued operation for a short time span.
3 sec. stop
48
Max. Number of Starts Per Hour
This rating indicates the allowable ratio of motor ON time to motor OFF time, and starts per hour for a hoist operated continuously
at 63% of rated capacity on the cycle below, assuming continued operation or repeated starting over a long time span.
1m lift | 1m lower |
3 sec. stop
1 cycle
•Single speed: 60 min
•Dual speed: 30/10 min
| stop |
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lift |
| lower |
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| stop |
t 1 | t 2 | t 3 | t 4 |
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| T (1 cycle) |
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Example (single speed): %ED = Motor ON time (t1 + t3) x 100
T (1 cycle)
(Where T = 1 cycle (t1 + t2 + t3 + t4) and is not more than 10 minutes.)
NER/ER Lifting Motor Ratings
• Single speed: 60% ED, 360 starts/hr
• Dual speed: 40/20% ED, 120/240 starts/hr
B U L L A R D ® A N D S H U R - L O C ® H O O K S
These hooks offer a positive locking latch feature. Consult Customer Service for full details.