GB/T 24817.3-2009 is Part 3 of the crane control device arrangement series, addressing the specific control characteristics and operational requirements of tower cranes. It defines the layout and operating characteristics of control devices. A well-designed control layout is critical to safe work at height. The following sections break down the key requirements of the standard.

Standard Scope and Tower Crane Operating Characteristics

GB/T 24817.3-2009 corresponds to ISO 7752-3:1985 (MOD) and is the third part of the GB/T 24817 series. Tower crane operation differs significantly from that of ground-based cranes: the operator's cab is positioned high on the tower mast (typically 20–60 m above ground), and the crane is controlled either directly from the cab or via a remote control. The three primary mechanisms — hoisting, slewing, and luffing (via trolley or luffing jib) — are each operated by independent control devices. Unlike mobile cranes, tower cranes generally have no travel control (except for the crane travel function on rail-mounted tower cranes), so the controls are grouped into three functional clusters: hoist, slew, and luff. The standard tailors its layout and operating direction requirements to these characteristics.

Control Device Layout in the Operator's Cab

The standard specifies that control devices inside the tower crane cab be arranged as follows:

Hoisting Control — The hoisting control lever is positioned to the right of the operator's seat (right-hand operation). Operating direction: pulling back raises the hook (hoisting), pushing forward lowers it (lowering). The hoist controller must provide a sufficient number of steps (at least 4 for hoisting, 3 for lowering) to accommodate high-speed operation with light loads and low-speed operation with heavy loads. For tower cranes with Variable Frequency Speed Control, a single-lever proportional controller may be used for stepless speed regulation.

Slewing Control — The slewing control lever is positioned to the left or left-front of the seat (left-hand operation). Operating direction: pushing left slews the crane to the left (counterclockwise rotation), pushing right slews it to the right (clockwise), both referenced to the forward-facing cab position. The slew controller should include a slewing brake button (thumb-operated) and a free-slewing selector switch. Acceleration and deceleration of the Slewing mechanism must be smooth; the standard requires that the starting angular acceleration at the jib tip (50 m radius) not exceed 0.1 m/s² to prevent excessive load swing.

Luffing Control — For trolley luffing tower cranes, the trolley luffing control lever is typically positioned to the left of the seat (on the same side as the slewing control but separated vertically or horizontally). Operating direction: pushing forward moves the trolley away from the cab (increasing the working radius), pulling back brings it closer (decreasing the radius). For luffing jib tower cranes, the luffing control lever operates as follows: pulling back raises the boom (decreasing the radius), pushing forward lowers it (increasing the radius) — consistent with the hoisting direction logic.

Crane Travel Control — For rail-mounted tower cranes, crane travel control may be located on the cab control console or operated via a floor remote control. Operating direction: pushing the lever forward moves the crane forward, pulling it back moves the crane in reverse. Travel Limit Switches and buffer stops must be fitted at both ends of the travel stroke.

Radio Remote Control Requirements

Tower cranes — particularly small and medium-sized units — commonly use Radio Remote Control for floor operation. The standard sets out the following design requirements for the remote control: it must be equipped with at least three joysticks (or proportional handles), one for each of the hoisting, slewing, and luffing mechanisms, with operating directions consistent with those in the cab (the "direction consistency" principle). The remote control must include an Emergency Stop Button (a large red button that, when pressed, cuts off the crane's main power supply and requires manual reset), and two start buttons that must be pressed simultaneously with both hands to energize the system, preventing accidental activation. Communication between the remote control and the crane must use encrypted frequency-hopping technology to prevent interference and unintended commands. When the remote control battery is low, an Audible and Visual Alarm must activate, providing a warning for at least 5 minutes before complete power loss. The effective control range must be no less than 100 m in open areas; beyond this range, or in the event of signal loss, the crane must automatically stop all operations.

Display and Indicator Devices

The standard requires the following display devices on the tower crane cab control console: a Load Limiter display screen (showing actual load, rated load, and load percentage), a working radius display (showing current radius, jib length, and angle), a Height Limit Switch indicator (showing hook height status), and an Anemometer display (real-time wind speed and alarm status). Display brightness must be adjustable to suit varying daylight and nighttime conditions. In addition to visual alarms, an audible alarm device with a sound pressure level of no less than 85 dB(A) must be provided. Kelude Heavy Industry tower crane control consoles are ergonomically optimized, with right-hand hoisting and left-hand slewing, allowing operators to work for over 200 hours without fatigue.

Kelude Heavy Industry: Overhead Cranes & Gantry Cranes

Kelude Heavy Industry is a leading manufacturer of overhead cranes and gantry cranes, delivering reliable material handling solutions for industrial applications across the United States and Europe. Our product range covers single-girder and double-girder overhead cranes, gantry cranes, and explosion-proof crane systems, engineered to meet the highest standards of safety and performance.

Overhead Cranes Built for Heavy-Duty Performance

Our overhead cranes are designed for continuous operation in demanding environments. Available in capacities from 1 ton to 100 tons (0.9 to 90.7 metric tons), these cranes feature low-headroom configurations, variable-frequency drives for smooth load control, and optional anti-sway technology for precise positioning. All models comply with ISO 4301 and ISO 12480 standards, ensuring structural integrity and operational safety.

For specialized applications, we offer explosion-proof overhead cranes certified for hazardous areas (ATEX / NEC 500), with fully sealed electrical enclosures and non-sparking components. These cranes are widely used in chemical plants, oil refineries, and paint shops where flammable gases or dust are present.

Gantry Cranes: Versatile Solutions for Outdoor & Indoor Use

Our gantry cranes are engineered for flexibility, with options for rubber-tired or rail-mounted configurations. Capacities range from 5 to 300 tons (4.5 to 272 metric tons), with spans up to 150 ft (45 m). These cranes are ideal for shipyards, steel yards, precast concrete plants, and container handling facilities.

All gantry cranes can be equipped with anti-sway systems, variable-frequency drives, and remote control operation. For outdoor installations, we provide galvanized or painted finishes with marine-grade protection, ensuring long-term durability in harsh weather conditions.

Electric Hoists & Trolleys for Precise Load Handling

Our electric wire rope hoists and chain hoists are designed for reliable performance with minimal maintenance. Available in capacities from 0.5 to 50 tons (0.45 to 45.4 t), these hoists feature self-locking brakes, thermal overload protection, and low-noise operation. Hoisting speeds can be customized to match your specific production requirements.

For applications requiring precise load positioning, we offer variable-frequency drive (VFD) hoists with anti-sway control, enabling accurate placement even at high speeds. All hoists are factory-tested and certified to meet CE and ISO 4306 standards.

Custom Engineered Crane Solutions

Beyond standard models, Kelude Heavy Industry provides fully customized crane systems tailored to your facility layout and process requirements. Our engineering team works closely with you to design cranes with special spans, lifting heights, end carriages, and control systems. We also offer retrofitting services to upgrade existing cranes with modern safety features and automation capabilities.

Whether you need a single crane or a complete material handling system, our team delivers on-time, on-budget solutions backed by comprehensive after-sales support, including spare parts availability and remote diagnostics.

Frequently Asked Questions

Q: What is the lead time for a standard overhead crane?
A: For standard models (QD, LH, LX series), lead time is typically 4–6 weeks from order confirmation. Custom engineered cranes may require 8–12 weeks depending on complexity.

Q: Do you provide installation and commissioning services?
A: Yes, we offer full installation, commissioning, and operator training services in the US and Europe. Our technicians are certified and follow all local safety regulations.

Q: Can your cranes be integrated with existing plant control systems?
A: Absolutely. Our cranes support Profibus, Modbus, and Ethernet/IP interfaces, allowing seamless integration with your PLC or SCADA systems.

Q: What warranty do you offer?
A: All cranes come with a 24-month warranty covering parts and labor. Extended warranty packages are available upon request.

Q: How do you ensure crane safety compliance?
A: Our cranes are designed and manufactured in accordance with ISO 4301, ISO 12480, and IEC 60204-32 standards. Each crane undergoes rigorous load testing and inspection before shipment.

Q: Do you offer spare parts for older crane models?
A: Yes, we maintain an extensive inventory of spare parts for all models manufactured in the last 20 years. Contact our support team with your crane serial number for quick identification.

Q: Can you provide explosion-proof cranes for Zone 1/21 areas?
A: Yes, we manufacture explosion-proof cranes certified for Zone 1, 2, 21, and 22 hazardous areas, with options for ATEX or NEC compliance.

Q: What is the maximum span available for gantry cranes?
A: Our standard gantry cranes can achieve spans up to 150 ft (45 m). For special requirements, we can engineer spans beyond this with additional structural analysis.

Safety and Emergency Control Systems

A: Tower cranes must be equipped with comprehensive safety controls and emergency devices. When a limit switch on any mechanism is activated, power to the hazardous direction of that mechanism must be cut off, allowing operation only in the safe direction. When the Overload Limiter is triggered (at ≥110% of rated load), hoisting up and luffing out must be stopped, accompanied by a continuous Audible and Visual Alarm. Pressing the Emergency Stop Button immediately halts all crane mechanisms—either by shutting down the engine (for diesel-powered units) or by disconnecting the main Power Supply contactor (for Electric models). For rail-mounted tower cranes, crane travel must be interlocked with Rail clamps and the travel motor: the travel motor cannot be started unless the Rail clamps are fully released.

Tower Crane Control Device Arrangement: Comparison Table

The comparison table below outlines the core Parameter configurations for the arrangement of control devices on tower cranes, serving as a reference for selection and operational personnel.

Frequently Asked Questions