COUNTRY:
Mexico
REFERENCE STANDARDS:
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.
PROJECT:
Study conducted in order to create a warehouse system for pallet storage using 2 stacker cranes.
SUPPLY DESCRIPTION:
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
Storage:
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
DISTINCTIVE ELEMENTS:
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
BENEFITS FOR THE CUSTOMER:
Thanks to our expertise in the field, the customer did not have to look for on-site suppliers to build the electrical system.
