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Calibration by keypad

 
Before proceeding please check that the RS485 LED is not lit
If the LED is lit this procedure will not work
Clear the RS485 mode before proceeding
 
Step 1 - Select the channel (s) to be calibrated
 
In normal operating mode - No LED 's are lit
 
Press the upper button “UP” to select the channel to be calibrated
Repeat pressing of the UP button will rotate the LED's to show which channels is to be selected
 
The following sequence of LED's will be lit:
 
  • Channel A & B  - LED's A and B are lit
  • Channel A - LED A is lit
  • Channel B - LED B is lit
 
After selection of the required channel(s) press the “ENTER“ key to commit
The 'Zero' LED will light up
 
Step 2 - Select the function to perform
 
There are three functions you can select at this point
By repeatedly pressing the “UP“ key the desired function is selected. 
 
The following functions can be selected when pressing the UP button:
 
  • Zero tare - LED ZERO is lit
  • Calibration - LED CAL is lit
  • Proportional Calibration - LED CAL and LED PROP are lit
  • Return to the selection of the channel (none of the above LED’s are lit)
 
After selection of the required function press the “ENTER“ key to commit
The next step will depend upon the function selected
 
Calibration
 
Zero adjustment - Zero LED is lit
 
After selecting the channel(s) to be calibrated as described above and by placing the module into zero mode the LED ZERO should be lit.
The LED UNLOAD should also be lit and automatic zeroing can then be performed. 
 
  • Remove all material on the sensing roll and confirm this by pressing  “ENTER“. 
  • The LED UNLOAD goes off and the automatic zeroing is performed.   Do not put any weights on the roll during this process. 
  • After the process is finished the LED “OK“ should light up for approximately 2 seconds. All other LED’s should be off. 
  • If the zeroing function was not successful (as range was exceeded), the LED ERROR will light to show this. Correct error and start procedure again.
 
The device is ready for the next adjustment or for operation
 
 
Span Adjustment (Calibration) - CAL LED is lit
 
After selecting the channel(s) to be calibrated as described above and by placing the module into calibration mode the LED CAL should be lit.
The LED LOAD should also be lit and automatic calibration can then be performed.  This point will automatically be selected if you have carried out a zero function.
 
  • Place a full scale load on the sensing roller as described in the load cell manual. Confirm this by pressing  “ENTER“. 
  • The LED LOAD goes off and the automatic calibration process is performed. Do not touch the sensing roll during this process.
  • After the process is finished the LED “OK“ should light up for approximately 2 seconds.  All other LED’s should be off. 
  • If the calibration function was not successful (as range was exceeded or there was insufficient load) the LED ERROR will light to show this. Correct error and start procedure again.
 
The device is ready for the next adjustment or for operation
 
 
Proportional calibration - CAL LED and PROP LED are lit
 
If you do not have a full load to apply to the sensing roll then you will need to select proportional calibration mode.
 
Following the selection of the channel(s) to be calibrated as described above and by placing the module into proportional calibration mode the LED CAL and the LED PROP should be lit.
The LED CAL will blink.  You can now adjust the required tension for the load as a percentage value given in Volts (in 40mV steps) with the keys “UP” and “ENTER” measured across the PROP OUT terminals [29 & 30]. At this point the “ENTER” key will function as “DOWN”.
Once this is done you can leave the adjustment mode by pressing down the last used key and at the same time the second key.
 
  • Place the proportional load on the sensing roller as described in the load cell manual. Confirm this by pressing,  “ENTER”. 
  • The LED LOAD and LED PROP go off and the automatic calibration process is performed. Do not touch the sensing roll during this process.
  • After the process is finished the LED OK should light up for approximately 2 seconds.  All other LED’s should be off. 
  • If the calibration function was not successful (as range was exceeded or there was insufficient load) the LED ERROR will light to show this. Correct error and start procedure again.
 
The device is ready for the next adjustment or for operation
 
Proportional Example:
 
If the required TOTAL load is 100kg but the available load is only 25kg then 2.5V has to be created across the PROP CAL output terminals[29 & 30]
2.5 Volts is equal to a 25% of full scale loading
5.0V is equal to 50% of full scale loading
7.5V is equal to 75% of full scale loading
 
The formulae is given as
(Proportional Load / Full Scale Load) x 10 in Volts