Digital Weighing Systems (P) Ltd.,

RAIL WEIGH BRIDGES:

Digital weghing systems from the past 10 years have been selling and supporting Weighing solutions to Sugar, Ferro Alloy, Cattle Feeds, Steel, Chemical, Plastics, Tea and many other industries. Digital weghing systems experience is not limited to Lorry / Cart Weighing but also extends to some demanding process weighing applications like Batching, Material handling and Check Weighing.

IN MOTION RAIL WEIGH BRIDGE

Digital's "MW 2100" In-motion Weighing System (DS 320 Version 1) overcomes many of the limitations inherent of conventional static weighing systems by being able to weigh wagons on the move.

The state of art highly sophisticated yet simple in-motion weighing system has been designed and developed indigenously. With conventional systems, each wagon has to be uncoupled from those adjacent to it, and then carefully positioned and parked on the weighbridge before its weight can be recorded.

DS320 intelligent, innovative system is designed to detect the different type of wagons to initiate the axle or bogie weighing. Also it automatically detects the different type of engines and eliminates its Weighment. The speed of wagon is directly related to the accuracy of weighment. The high speed A/D Micro Controller are having a remarkable compatibility to achieve accurate weighment even up to a speed of *15KM/hr.

TRACK REQUIREMENTS BRIDGE

The MWS2100 is a Micro-controller based menu driven Electronic Digital Weight Indicator designed for high performance industrial weighing applications. In this the user selects the operating functions appropriate to his application requirements. The weighing system offers the following features:

For getting optimum accuracy, the following track conditions are recommended.

Approximate 100Mtrs straight track either side of the Weighbridge.
The track at both end of the weigh bridge of 100 Mtrs desired to be level tangent with gradient not exceeding "1 in 300"
Points or crossings up to a distance of about 100 Mtrs of Both end of the Weighbridge are needed to be avoided.
Concrete sleepers upto 100 mtrs & RCC Base atleast 20 Mtrs on either side of the track should be well ballastic and settled at both end.
Non Weighing speed should not be more than 25 kmp.

SYSTEM OVERVIEW

The load cell based in-motion weighing system consisting of 4 load cells, weighbridge with prefabricated supporting structure and rail approaches. The load cells are strain gauge based sensors, which convert weight in to electrical signal with very high accuracy and stability. Wagon movement on the weighbridge is identified by Track Switches placed on either side of bridges, to detect the direction, type of wagon, start and stop weighment.

The approach Rails are rigidly tightened with approach beams to restrict the rail movement and smooth load transfer to the weighbridge. The misalignment of approach rails and weigh rail may induce errors in accuracy.

TRACK SWITCHES

Track sensors / switches are placed along the approach and weighrails in a manner that 4 axle, 2 axle and engine movement can generate a fixed pattern to initiate the weighing cycle.

Since the foot print of rail wheel is 300mm, a set of proximity sensors are placed with a set of stainless steel rod at a distance of 100mm (a distance between first and second arm of track switch), so that the train movement can operate and will generate a forward track logic pattern of INITIALLY LOGIC IS 1 1.

TRACK PATTERN	LOGIC PATTERN
FIRST ARM HOLD	0 1
BOTH ON HOLD	0 0
FIRST ARM RELEASE	1 0
SECOND ARM RELEASE	1 1

TECHNICAL SPECIFICATION

MeasureMent Rate	20000 Measurementspersecond	Operation	Menu Driven
Resolution	Selectable	Weighing Range	0 to Rated load
Over capacity	Visual Indication provided in Weight display & Message Display	Interface through	IBM Compatible, 104 Keys PC Keyboard
Visual Display	16 mm, 6 Digits, 7 Segment for Weight Display 5 mm 16 character 2 line Alpha numeric for Msg Display	software	User friendly, Menu Driven
Polarity indication	“-“ Sign in weight display and annunciation in message display	Self Diagnostics	Provided
Calibration	Software (Password protected )	Auto Latching	Provided
Decimal Point	Selectable	EMI/RFI	Signal, Excitation, lines protected
AZM Capture Range	Selectable	Power Supply	230 V AC + 10 %, 50 Hz + 3 Hz, Single Phase
Motion Band	Selectable	Power Consumption	80 VA
Serial Output	2 serial port	Temperature Range	5 to 55 Degree Centigrade
Optional Output	RS 422/485	Humidity	0 to 90 % non – condensing
Printer Port	Centronics parallel port (Optional)	Enclosure	Floor mounted
A/D Conversion	16 Bit high resolution	Standards	OIML & BIS
Analog Input	4 Nos. optically isolated active high inputs
Digital Output	4 Nos. potential outputs with contact rating of 24VDC/1 Amp		Approved By Government of India
Real Time Clock	Provided

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