Hardy HI 1756-nDF - Manual (Page 7)

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Chapter 1
Weighing System Tests - Optional
This test is used to diagnose drifting or unstable weight reading problems. It requires the
HI 215IT Series Junction Box for full utilization. The ability to read the weight seen by
the individual load sensors allows you to use this test for making cornering, leveling and
load sharing adjustments to the weighing system.
The Weighing System Test provides the following problem detection support:
1. Disconnects the controller and engages an internal reference signal to see if the
problem is inside of the instrument.
2. Disconnects the load sensors and engages an internal (in the junction box)
reference signal to see if the cable between the instrument and the Junction Box
is causing the problem.
3. Reads the weight of each load sensor to see if the load sensor might be causing
the problem.
Automatic or Manual Refill
Automatic refill uses user-selectable refill points to start and stop the refill process
between dispense cycles. Automatic refill is only set for Dispense single speed mode.
The relay B is the default refill relay in single mode and dribble feed in the dual mode. A
command status of -1 will be set when the automatic refill is incorrectly configured.
Automatic refill is not usable in the filler mode as the refill source vessel weight is not
monitored by the HI 1756 nDF.
In the automatic refill mode, if weight at the end of a single speed dispense cycle is equal
to or below the start refill weight parameter value, then the dispense cycle is disabled
and the refill cycle started automatically; once the weight reaches the stop refill weight
parameter value the refill cycle is stopped. Once the refill cycle is complete the dispense
cycle is once again enabled. In this mode relay RA on the weigh scale channel would be
used for the dispense cycle and relay RB on the same weigh scale channel would be used
for the refill cycle.
Start Refill Weight
Stop Refill Weight
1756-1DF
Weight value
Dispense Valve Control
RA1
RB1
Refill Valve Control
An Automatic Refill Example