Running ropes. A thorough inspection of all ropes shall be made at least once a month and a certification record which includes the date of inspection, the signature of the person who performed the inspection and an identifier for the ropes which were inspected shall be kept on file where readily available to appointed personnel. Any deterioration, resulting in appreciable loss of original strength, shall be carefully observed and determination made as to whether further use of the rope would constitute a safety hazard. Some of the conditions that could result in an appreciable loss of strength are the following:
Reduction of rope diameter below nominal diameter due to loss of core support, internal or external corrosion, or wear of outside wires.
A number of broken outside wires and the degree of distribution or concentration of such broken wires.
Worn outside wires.
Corroded or broken wires at end connections.
Corroded, cracked, bent, worn, or improperly applied end connections.
Severe kinking, crushing, cutting, or unstranding.
Does OSHA consider a visual rotating beacon or strobe light an acceptable warning signal on a radio operated crane?
Title 29 CFR 1910.179(i), warning devices, states: [e]xcept for floor operated cranes a gong or other effective warning signal shall be provided for each crane equipped with a power traveling mechanism. Although the source of 29 CFR 1910.179 did not provide specific examples of an "effective warning signal," ANSI standard B30.2-1967, Overhead and Gantry Cranes, a subsequent revision of this standard, ASME B30.2-2005, Overhead and Gantry Cranes 2-1.15.3 Types of Devices, states that [one]ne or more of the following devices shall be provided when require:
Here is some information concerning phase converters and wire rope hoist and crane that might help prevent problems.
Some have worked and others have burnt components.
1. The phase converter type required is for CNC machines. This type has a +/-5% tolerance. A tighter phase to phase tolerance can also be requested as an additional option. The Industrial Phase type converter allows too much of a voltage difference between load and no load and the inverters can shut down due to phase balance faults. Repeated faults can damage components.
2. The step-up/step down transformer, if used, must be connected in front of the phase converter. The multi-tap single phase transformer is preferred to insure the correct voltages can be achieved. Installing a three phase transformer after the phase converter increases the amount of voltage variances of the manufactured phase and will cause inverter faults/failures. By adding a multi-tap single phase transformer, you can order a standard 460 volt crane kit or hoist and a 460 volt phase converter due to transforming the input voltage before it goes to the phase converter.
3. The trolley and bridge auto-transformers must be properly connected before power is applied to the inverters. The voltage going to the inverters should be about 460 volts to allow variation of the manufactured phase.
4. All inverters must have line reactors to filter the noise.
5. The phase converter must be used for the crane/hoist only and must be sized correctly. An oversize phase converter can cause problems. Connecting other equipment to the phase converter can change the amount of power and loads to the equipment.
6. The manufactured phase should be on phase three. Proper phasing of the single phase electrical components (such as brakes, control transformers, etc.) will be required. There is a system that was installed in 2002 and has been working without problems. The company that supplied the 460 volt phase converter and single phase multi-tap transformer is:
7. an oversized industrial phase converter and the three phase buck/boost transformer. With auto-transformers the voltage going to the inverters was over 560 volts.
Please feel free to contact me if you have any questions