Hardy HI 4050, Руководство пользователя, Страница: 161 / 192

Troubleshooting 153
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K - Load Sharing and Load Sensor Checkout
1) Does the mV signal increase in a positive direction
2) If you receive a negative result, check if load cell is
mounted correctly.
K
(a) The arrow goes with the direction of force
(b) If there isn’t an arrow, you must manually verify
the correct direction. A negative reading
indicates the load cell is upside down
(c) Load cells in tension will not reflect a negative
reading if installed upside down. If upside down,
only the force applied by the cable will be included
in the weight reading
(d) If you are still receiving a negative signal, verify
load cell wire color code
K1
Load Cell wiring is
complete and
correct?
K2
Multiple load cells
MAP the mV reading.
Balance the load
1) Verify a positive mV reading from each load sensor using
IT TEST, mV
2) Record the mV reading and compare each corner for
proper load sharing
(a) For proper load sharing you should see only a difference
of +/- .5mV
(b) Larger differences due to motors and piping
should not /- 2mV
(c) If there aren’t any motors, valves or piping to explain
the mV difference, adjust the corners and balance
the mV readings
(d) Use shims or if equipped adjusting bolts on the load
cell mounting hardware
(e) Drawing a load cell map helps determine the correct
leg to adjust and in which direction
Monitor system for proper
operation
Check out completely
1) Using a spirit level, verify the vessel is vertically and
horizontally correct
2) Verify if any height change effects the attitude of adjacent
vessels or piping
3) Adjust each leg to dynamically match mV outputs
4) Verify the mV readings and physical level when complete
Three load cells balance like a three legged chair
1) Use the Weight and Voltage test to determine the sum of the
load cell signals to set your target mV reading for each load
cell
2) Read the output of individual load cells
3) Adjust the load cell with the lowest reading to dynamically
match the target mV readings obtained in Step 1
4) Read the mV readings from each load cell to verify a proper
correction
5) Repeat steps 3 and 4 to achieve a proper load sharing vessel
6) Verify the mV readings and vessel level when complete
Four or more load cells present a challenge