Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 14)

HI 2151/30WC MANUAL
1-2
used as a front end for a control system, transmitting weight values via
a standard operator-selectable serial port (RS-232, RS-422/485) to pro-
grammable logic controllers (PLC's), computers, and printers.
Data is displayed alpha-numerically on the six-digit, fourteen segment
LED display and graphically on the 30-segment bar-graph display.
Weight values can be based on either net, gross, Rate-of-Change
(ROC), peak hold or totalized weight values in pounds or kilograms.
An optional Allen Bradley Remote I/O and PROFIBUS interface is
available for communication to programmable logic controllers. The
weight controller’s 20-bit, analog-to-digital converter updates twenty
times per second and is capable of 985,000 counts of display resolu-
tion. This provides enough resolution for accurate weight measurement
and enough control to tolerate large “dead” loads and over sizing of
load cells/sensors. Users can enter commands either from the commu-
nication ports or locally from a sixteen-button, front-panel keypad. A
portion of the keys can be locked out to limit operator access and pro-
tect data. A limited number of commands can be entered through a rear
Remote Functions connector.
WAVERSAVER
®
Typically, mechanical noise from other machinery in a plant environ-
ment exists in all industrial weight control and measurement applica-
tions. WAVERSAVER
®
enables the weight controller to distinguish the
actual weight data from the mechanical noise that comes in on the load
cell signal. WAVERSAVER
®
can be configured from the front panel to
ignore noise with frequencies as low as 0.25 Hz. Users can select one
of four higher additional cut-off frequencies to provide a faster instru-
ment response time. The default factory configuration is 0.50 Hz vibra-
tion frequency immunity.
C2
®
Calibration C2 second-generation electronic calibration can calibrate a scale sys-
tem without using certified test weights. A C2 weighing system con-
sists of up to eight load sensors, a junction box, interconnect cable and
an instrument with C2 capabilities, such as the HI 2151/30WC. Each
Hardy Instruments C2-certified load sensor sends a distinct digital sig-
nal that the HI 2151/30WC uses to calculate weight and count the num-
ber of sensors in the system. To factor in any known weight on the
scale, the user enters a reference value from the front panel. (A zero
reference value indicates there is no weight on the scale.)
The instrument is also capable of performing traditional calibration
such as with the use of certified test weights.
IT
®
INTEGRATED TECHNICIAN™ is a built-in diagnostics utility that
continuously monitors the system and allows the operator to rapidly
troubleshoot problems from the front panel. Adding an optional an IT
junction box extends the diagnostics capability to any load sensor.