R51/2006-B-GB1-18.03

DESCRIPTIVE ANNEX

Introduction

This family of instruments, designated the Versa312Y, comprises patterns designed to operate as automatic catchweighing instruments (Category Y). The instruments may be configured as single or multi-range, with a maximum of three weighing ranges.

The instruments comprise a cabinet with user interface, weighing device, mechanical handling facilities and reject device. The instrument is designed to weigh packs dynamically.

Construction:

The instrument is constructed in stainless steel. The framework is a fabricated floor standing stainless steel frame on adjustable feet. On the frame are mounted the modular conveyor sections (in-feed, weigh platform, and out-feed). The conveyors type, number, size and shape are not restricted. The out-feed conveyor can be equipped with one of a number of reject devices, including a flipper, drop flap, ram or air blast. The in-feed or out- feed conveyors may be equipped with quality control system such as photocells, metal detectors or X-rays. The instrument is designed to be permanently installed, a level indicator is located on the main support beam, near the load cell mounting, or on the main support structure of the weighing section.

The cabinet houses the electrical hardware and is located behind the conveyor. A remote cabinet configuration may also be used. The command signals are sent to the modular conveyor sections including weighing platform via signal cables. A console at the top of the control cabinet contains a touch screen display. Photocells mounted at either end and either side of the conveyor are used for pack detection.

The system uses photocells to determine when the packs have passed to the weigh platform. The instrument captures the weight when the stability of equilibrium has been reached.

Packs are weighed as they pass over the weigh platform which runs continuously at the match speed of the in-feed and out-feed conveyors.

The instrument stores the individual weights; treaceability between measurement data and packs must be provided in normal operation.

Weighing platform

The weighing platform is as follows:

Any compatible load cell may be used providing the following conditions are met:

• There is a respective OIML Certificate (R60) issued for the load cell.

• The certificate contains the load cell types and the necessary load cell data required for the manufacturer's declaration of compatibility of modules and any particular installation requirements. A load cell marked NH is allowed only if humidity testing to R51(2006) has been conducted on this load cell.

• It is not a load cell with digital output

• The characteristics of the replacement load cell such as $ n_{lc} $ , Y, Z are the same or better that the load cell tested dynamically (Bizerba BB15, $ E_{\mathrm{max}}=18\mathrm{kg} $ )

• No oil damper is used.

• The design of the load cells and the material are the same.

• The minimum input voltage per verification scale interval must be less than 0.556 $ \mu\mathrm{V} $

Electrical

The control cabinet is accessed from a door at the back. Inside are the main board, load cell module, filters, circuit breakers, power supplies, motor drive cards and appropriate input/output modules for external electrical interfaces such as the out-feed mechanisms and external peripherals.

The "Weighing engine" module (part number 308762) comprises a CPU (ARM-Cortex M4 processor based 32-bit 120 MHz Part number: 1020900NWE002), A/D converter (Analog Devices BlackFin 400 MHz digital signal processor, Part number: 088406). The module is directly connected to the load cell with a 4-wire (optional 6-wire) cable and reads and digitises the analogue load cell signal. The BlackFin reads this digital value and performs digital filtering and processing of the signal to produce the individual pack weight. Weight data is transmitted via internal SPI to the main CPU that executes package classification, statistics and rejecting if requested. The final result is transferred to the HMI via internal Ethernet and SPIbus networks. The module also controls the conveyor belt motors via CAN bus, and the ejection system via BIO-bus or through on board I/O.

The control and display interface (HMI) comprises of a PC running Microsoft Windows 7. It includes a touch screen type 10.4 (diagonal) XGA (1024 x 768 resolution) colour backlit LCD touch screen display, and allows configuration of the system and its monitoring.

• Automatic zero setting at least once every 15 minutes if no zero-tracking occurred

• Zero-tracking ( $ \leq 4 % $ Max)

• Semi-automatic zero-setting ( $ \leq $ 4% Max)

• Initial zero-setting ( $ \leq 20% $ Max)

• Zero-indicating

• Pre-set tare device (subtractive)

• Single or multi-range operation

• Static calibration, not accessible to the user

• Belt speed setting (dynamic calibration), not accessible to the user after sealing

• Screen check at power-up

• High resolution mode (0.1e) for testing purposes, not accessible to the user after sealing

Software:

The general software is designated V312, the legally relevant module is designated MIDModule/DataProcessing/Controls Modules. These software designations are shown in Menu Tools Versions and can also be displayed at any time upon command. The software is held in the Weighing Engine and partially on the HMI, and can only be changed at factory level via Ethernet.

Verification information is as below:

The software version number is designated AA.SS.MM.mm (i.e. 43.00.01.00), with:

AA - identifies the software application / module.

SS - custom made version / dedicated versions.

MM-major release.

mm-minor release.

The legally relevant software modules are detailed in the following table, together with version number and verification checksum:

V312Y Standard Application 43.00.01.XX

Access to the legally relevant part of the software is protected by a jumper inside the cabinet, located within the sealed Weigh Engine. The jumper needs to be removed to modify any legally relevant parameter and can only be done at factory level.

Static and dynamic calibrations of the instrument also require the jumper to be removed.

The HMI software is protected by comparing the CRC checksum value with the pre-stored value in the internal flash memory on the WE. Mismatched CRC values prevents the WE to be operative.

Interfaces

• Ethernet

USB

RS232

Approval conditions

The instrument shall bear the inscriptions required by the national and regional legislations.

The instrument is designed to be permanently installed.

Traceability between measurement data and packs must be provided in normal operation.

Sealing

Components that may not be dismantled or adjusted by the user (load cell, A/D board, calibration jumper) are located behind a metallic cover protected by either a wire and seal or tamper evident label and securing mark. The integrated USB storage shall also be sealed.

The sealings must bear an official mark, which may be either:

• a mark of the manufacturer and/or manufacturer's representative, or

• an official mark of a verification officer.

Alternatives

There are currently no authorised alternatives.