Rice Lake MotoWeigh In-Motion Checkweighers and Conveyor Scales - Manual (Page 4)

Introduction and Theory of Operation 1
About This Manual
This manual is intended for use by service technicians
responsible for installing and servicing the
Motoweigh Dynamic In-Motion Checkweighing
System.
Operation of the Motoweigh Integrator is explained in
the integrator manual, PN 108790.
Configuration and calibration of the Dynamic
Conveyor Scale Integrator can be accomplished using
serial commands or the indicator front panel keys. See
the
920i
Installation Manual, PN 67887, for more
information about configuration methods.
The Motoweigh dynamic in-motion
checkweighing system has many moving
parts so great care must be used when
working on the unit. Procedures are to be
performed by qualified service personnel
only.
A u t h o r i z e d d i s t r i b u t o r s a n d t h e i r
employees can view or download this
manual from the Rice Lake Weighing
S y s t e m s d i s t r i b u t o r s i t e a t
www.ricelake.com
.
1.0 Introduction and Theory of Operation
The Motoweigh dynamic in-motion checkweighing system is a continuous process weighing instrument which
can be used for product sortation and data collection. the system averages the weights on the scale, displays the
averaged weight, and sends the average weight information out using the DSCI (Dynamic Conveyor Scale
Integrator) using a serial port.
The system utilizes the following main components.
• A scale merged with a conveyor and drive mechanism.
• Two photo eyes to trigger start and stop operation.
• An integrator (920i HMI) linked and programmed to average the weight signal at the rate of 60 times per
second between the start and stop photo eye inputs.
After the object passes in front of the entrance photo eye, it starts the scale integrator (920i), averaging the weight
on the scale. At this time, the scale display shows dashes [ - - - - ]. The object proceeds down the scale conveyor
until it passes in front of the exit photo eye, at which time the integrator’s averaging process is stopped and the
averaged weight is displayed.
A smooth product transition and matching belt speeds are absolutely necessary to achieve accurate results. Photo
eyes and reflectors must be kept clean for optimal performance. Even though the equipment is wash down rated,
extreme water pressure should be avoided around the electronic components.
1.1 Hardware Requirements
• Heavy duty tubular construction
• 230V variable speed motors x 3
¶
3 phase
¶
1/2 horsepower
¶
1 full load amp @ 460 VAC
• 100% overload protection
• Adustable line height +/- 2”
• RS-232 real time straight weight transmission
• Industrial grade belting