The machine and the safety devices controlling it comply with the standards and directives in force in America (USA), although the plant is located in Mexico.

Some of the most important ones are listed in the following table.

UL508A Industrial control panel

NFPA79 Electrical Standard for Industrial Machinery

UL 61010 Electrical Equipment for Measurement, Control, and Laboratory Use

UL 60947 Low-Voltage Switchgear and Controlgear

UL 508C Power conversion equipment

UL 98 Standard for safety enclosed and dead-front switches

UL 489 Standard for safety molded-case circuit breakers

UL 50 Enclosures for electrical equipment: cabinets

UL508A Industrial control panel

UNI EN 528:2009 New European standard specifying the safety requirements for stacker cranes

Other consulted standards

EN 60204-1 Safety of machinery – Electrical equipment of machines

Part 1: General requirements

EN-61439-1 Low-voltage switchgear and controlgear assemblies (LV panels)

Part 1: General requirements

EN-61439-2 Low-voltage switchgear and controlgear assemblies (low-voltage panels)

Parte 2: Power panels

UNI EN ISO 12100:2010

Safety of machinery – General principles for design – Risk assessment and risk reduction

UNI EN ISO 13849-1 Safety of machinery – Safety-related parts of control systems

Part 1: General principles for design

UNI EN ISO 13849-2 Safety of machinery – Safety-related parts of control systems

Part 2: Validation

UNI EN ISO 13855:2010 Safety of machinery – Positioning of safeguards with respect to the approach speeds of parts of the human body

UNI EN ISO 13857:2008 Safety of machinery. Safety distances to prevent hazard zones being reached by upper limbs

UNI EN ISO 14119:2013 Safety of machinery – Interlocking devices associated with guards – Principles for design and selection

UNI EN 619:2011 Continuous handling equipment and systems – Safety and EMC requirements for equipment for mechanical handling of unit loads.

Study conducted in order to create a warehouse system for pallet storage using 2 stacker cranes.

The system consists of two self-supporting shelving blocks with double depth, used to store loading units (UDC) placed on slave pallets.

Warehouse data:
Height: 28,800 mm – Max length: 54,780 mm – Max width: 14,365 mm

Channels: 26 nos. per each aisle
Total levels: 14 nos. per each aisle
Depth: 1 no. per each aisle
Net max storage capacity: 1456 loading units

Possible handling – Combined cycles
Input cycles: 25 pallet / hour
At the same time as:
Output cycles: 25 pallet / hour

Handling that can be carried out with the stacker crane – Single cycles
Input cycles: 50 pallet / hour
At the same time as:
Output cycles: 50 pallet / hour


The on-board machine system was realized according to the final customer’s requirements, in compliance with the standard for Hazardous Location as per request (Class II Division2) pursuant to NFPA70.

Line voltage: 480 V +/-5%

Frequency: 60 Hz

Three-phase + TN earth distribution system

Power circuits rated voltage: 480 V

Service circuit rated voltage: 120 V

Control voltage

Input /Output

Contactors, relays and lamps

24 V DC

Power supply of on-board utilities for stacker crane with 4-conductor Busbar (VAHLE)

PROFINET functional data protocol

PROFISAFE safety data protocol

Degrees of protection for NEMA electrical system type 4, 4x, 12

Protection for NEMA electrical panel type 12

The system is designed and built to safely operate at the following environmental conditions:

Altitude 1800 m a.s.l.

Place of installation: normal, not classified

Outdoor ambient temperature ranging between 6°C and 30°C

Controlled temperature inside the warehouse: 15°C to 28°C

Max relative humidity: 80%

Ambient lighting: 200 Lux (at customer’s care and charge)

Stacker crane dimension:

Machine height: 28,800 mm

X axis movement speed (horizontal): 2.1 m/s

X axis movement acceleration X (horizontal): 0.3 m/s²

Y axis lifting speed (vertical): 0.8 m/s

Y axis lifting acceleration (vertical): 0.4 m/s²

Z axis forking speed (without load): 0.83 m/s

Z axis forking acceleration (without load): 0.83 m/s²

Z axis forking speed (with load): 0.4 m/s

Z axis forking acceleration Z (with load): 0.3 m/s²

Thanks to our expertise in the field, the customer did not have to look for on-site suppliers to build the electrical system.