SDWH Hoist: Optional Features/Equipment
Closed loop variable speed drive (VFD) on hoisting and lowering:
Speeds are varied by means of a frequency inverter in ”closed loop” with a motor encoder which provides a high safety level through continuous speed monitoring. As standard this system provides the facility to programmed hoisting and lowering speeds as well as acceleration and deceleration to suit your application. Gentle acceleration reduces the loading of mechanisms and improves productivity, hoist life and safety.
Electrical braking when slowing from fast to slow speed:
Electrical braking of the hoist motor is standard with SDWH which significantly reduces wear on the mechanical hoist brake linings.
Programmable speed possibilities
Micro-speeds:
A benefit of closed loop monitoring is the possible to programmed extremely slow micro-speeds for hoisting and lowering which enhances safety when positioning fragile or potentially hazardous loads. Maximum fast to slow speed ratios of 10:1 are standard on all models but the options of 20:1 or even slower are available.
Ramp and hold or preset speeds hoist and trolley:
The standard control setting is ‘ramp and hold’ for infinitely variable speeds on both hoist and trolley. Two position controls allow the operator to start in micro-speed and ramp up towards full speed with the ability to hold any speed in between. Alternatively the standard controls can simply be set for two pre-set speeds. Multiple speed options are also available.
No load express lift:
This option provides a very economical way to increase productivity by significantly increasing hoisting and lowering speeds when there is no load on the hook.
Load dependent speed (LDS):
LDS provides optimum efficiency/minimum cycle time with automatic and incremental increase in hoisting and lowering speeds for medium, small and zero load. Heavy loads must be handled at slower speeds to maintain safety.
Anti-Sway control:
This software operates in conjunction with VFD controls to totally eradicate any load swing caused by the travelling movements in one or both axis (travel and traverse). Anti-sway provides the operator with greater control over the crane/hoist allowing precise load handling and positioning. Speeds can be safely increased allowing faster cycle times and increased efficiency by as much as 50%. As well as reducing operator fatigue and improving safety, this feature can also extend the life of your crane/hoist as the electrical and mechanical components within the structures are subject to less stress.
