Electrical Components - ASME-BTH-1-2014-1

E-1 GENERAL E-1.1 Purpose

The primary focus of Chapter 5 is directed toward lifters that are attached to cranes, hoists, and other lifting equipment. Therefore, electrical equipment used on these lifters is governed by ANSI/NFPA 70. Sometimes a lifter could be a component part of a machine tool system and could be subjected to the requirements of ANSI/NFPA 79 if specified, but the standard lifter is not intended to meet the electrical requirements of the machine tool industry.

E-2 ELECTRIC MOTORS AND BRAKES E-2.1 Motors

Due to the variety and complexity of below-the-hook lifting devices, the method of horsepower calculation varies with the type of lifter and is not specified in this section. The horsepower selection shall be specified by a qualified person giving full consideration to the fric-tional losses of the lifter, the maximum locked rotor torque required, and the geometry of the speed torque curve of the motor applied.

E-2.2 Motor Sizing

A lifter may have varying horsepower requirements as it moves through its operating range. The intent of this provision is to ensure that the motor is properly sized for the maximum effort required.

E-2.4 Insulation

This provision recognized that Class A insulation is no longer used in quality motor manufacturing.

E-2.5 Brakes

Back driving may present a safety problem not obvi-ous to everyone and is stated to emphasize its impor-tance. The 150% value equals the requirement for hoist brakes as defined in CMAA #70 and AIST Technical Report No. 6.

E-2.6 Voltage Rating

The wiring between the crane hoist and the lifter must be sized to limit voltage drops, as well as current car-rying capacity.

1This Nonmandatory Appendix contains commentary that may assist in the use and understanding of Chapter 5. Paragraphs in this Appendix correspond with paragraphs in Chapter 5.

E-3 OPERATOR INTERFACE E-3.1 Locating Operator Interface

Below-the-hook lifters are not stand-alone machines.

They are intended to be used with cranes, hoists, and other lifting equipment. When attached to a lifting appa-ratus, the resulting electrical system must be coordi-nated by a qualified person with due consideration for safety and performance.

E-3.3 Operating Levers

These provisions parallel requirements found in the electrical sections of other established crane and hoist specifications such as CMAA #70 and CMAA #74 and are listed in this Standard to maintain compatibility between the crane and lifter.

E-3.4 Control Circuits

E-3.5 Push-Button Type

E-3.6 Push-Button Markings

E-4 CONTROLLERS AND AUXILIARY EQUIPMENT E-4.2 Control Location

Below-the-hook lifting devices are intended to be sus-pended from a hoist hook and may be subjected to unin-tended abuse and harsh environments depending on conditions of use. These provisions are intended to ensure protection of the electrical devices mounted on the lifter.

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--``,,`,,``,,,`,,,`,`,`,,,,``,``-`-`,,`,,`,`,,`---E-4.4 Magnetic Control Contactors

These provisions parallel requirements found in the electrical sections of established crane and hoist specifi-cations such as CMAA #70 and CMAA #74 and are listed in this Standard to maintain compatibility between the crane and lifter.

E-4.5 Static and Inverter Controls

E-4.7 Rectifiers

This provision recognizes that a DC motor can be reversed via a two-wire circuit when diode logic is

applied, and lists specifications for the type and size of diodes to be used.

E-4.8 Electrical Enclosures

E-5 GROUNDING E-5.1 Grounding Method

This provision recognizes that a high quality ground may be required at the lifter when electronic controls are employed.

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In document ASME-BTH-1-2014-1 (Page 76-81)