Rice Lake BCi Belt Scale - Installation & Operation Manual Version 2.00 - Manual (Page 17)

BCi Installation & Operation Manual - Introduction and Overview 11
The favorable location for the speed sensor is the tail roll of the conveyor, provided that the conveyor is not
driven from the tail, and that the tail roll is accessible.
Figure 1-12. Speed Sensor Pulley
If the tail roll is not accessible then the speed sensor can be mounted on a tailing wheel that rides on the return
side of the belt, or on a live shaft roller. If a trailing wheel is used, the wheel should be located on a section of the
belt in which belt vibration will not add movement to the wheel. The preferable location would be directly
opposite a conveyor return roll.
If a live shaft roller is installed to sense the belt speed, the roller should have positive contact with the belt. The
preferred location would be between two return idlers with the speed roller being installed on the top side of the
returning belt and the return idlers installed on the bottom side.
Electronic Wiring Location
The location for the electronics to be mounted is determined by accessibility, wire routing, and environment. The
scale electronics require a clean and stable 120 VAC supply. The enclosure for the electronics is rated NEMA
4X. The electronics can be mounted up to 2000’ away from the scale carriage provided the optional load cell
sense wiring is installed. If the electronics are to be installed within 200’ of the scale carriage, the optional sense
wiring is not required. To reduce the effects of signal interference, the scale signals should not be run in conduit
or cable trays in conjunction with high voltage cables.
The digital input and output signals are compatible with OPTO 22 G4 5VDC relay modules and can be
controlled with AC, DC or dry contact signals. The analog output signal for rate of flow can be wired for 0-10
VDC, 2-10 VDC, 0-20mA current or 4- 20mA current. The printer signal can be RS-232, RS-485, or 20mA
current loop.
Speed Wheel
If an optional speed wheel is used, the wheel should be located on a section of the belt in which belt vibration
will not add movement to the wheel. The preferable location would be directly opposite a conveyor return roll.
Figure 1-13. Optional Speed Wheel Assembly