Hardy HI 1756-nDF - Manual (Page 6)

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Chapter 1
for nosier environments while the 145 updates per second mode provides a faster
response time to changes in the flow rate.
The module supports both C2 electronic calibration and hard calibration (i.e., traditional
calibration with weights).
Typical Applications
Dispenser filler control can be used in a variety of material-flow applications.
The 1756 nDF Controller can control up to two ingredients per weigh scale channel, in a
filler mode, using two integrated DC or AC relays which can be independently controlled
automatically through programmable set point values or manually. The setpoint values
can be adjusted throughout the fill cycle, however once a relay is OPENED (external
valve is closed) it cannot be CLOSED again until the next fill cycle is started.
Features and Capabilities
C2® Calibration
Traditional calibration uses certified test weights. C2® Electronic Calibration allows a
scale to be calibrated without the need for test weights. A C2® weighing system consists
of up to eight load cell sensors per channel, a junction box, interconnect cable, and an
instrument with C2® capabilities (e.g., the HI 1756 nDF). Each Hardy Process Solutions
C2-certified load sensor outputs digital information used for calculating the calibration.
When the HI 1756 nDF reads the signals from the load sensors, it calibrates the scale
based on the load sensor’s output plus a user-supplied reference point value (from 0 to
any known weight on the scale).
NOTE C2® is registered trademarks of Hardy Process Solutions Inc.
WAVERSAVER®
When measuring small weight changes, the affects of mechanical vibration and noise
from the feeders and plant environment can introduce substantial interference.
WAVERSAVER factors out vibration, noise, and other interference-related signals from
the load cell so the rate controller can better decipher the actual weight data.
While WAVERSAVER can factor out noise with frequencies as low as 0.25 Hz, five cut-
off frequencies can be selected, with higher frequencies providing a faster response time.
The default factory setting is 1 Hz vibration frequency immunity.
Integrated Technician™
The HI 1756 nDF Integrated Technician™ (IT®) is built-in system diagnostics that
makes it possible to diagnose weighing system problems. IT allows the reading of
individual load sensor voltages and weights and isolates individual system components
for quick and easy troubleshooting.
Digital Volt Meter (DVM) - Option
DVM requires the HI 215IT Series Junction Box to monitor mV/V readings for each load
sensor and the total system. When the operator detects a problem, the DVM readings help
to isolate the faulty component. Further, the DVM readings can be used to level a system
and to make corner adjustments to platform scales. Accuracy is +/- 2% or better of full
scale.
NOTE If you do not have the HI 215IT Junction Box connected to the module, the reading is the
total for all load cells on the system.