Conair GB/ WSB manual Verifying Load Cell Function

Page 84

VERIFYING LOAD CELL FUNCTION

Most Problems are related to LOAD CELL function.

There are several ways to VERIFY that the load cells are functioning properly. The slightest touch on the weigh bin should result in a change in the readout. If this is not the case, something is wrong. When the light touch is removed, the display should return to its starting point. If this does not happen, something is interfering with free movement of the cell or the bin. Make a careful inspection of EVERYTHING around the load cells, the hanger bolts, the weigh bin tray and the weigh bin. NOTHING should interfere with free movement.

NOTE: It is normal for load cell readout to drift several grams over time and with different temperatures. Since all the component dispenses are weighed by a single set of load cells, this drift will affect all components equally and, therefore, the ratio of the components will remain accurate. Empty weight is always TARED so each dispense is accurately measured.

The following observations will verify proper load cell operation:

When the bin is empty, between cycles, the display should read near zero. An error of several grams is not important since this empty weight reading is "tared" from all dispense readings. The "empty weight" readings should be consistently within 1 or 2 grams.

The addition of several pellets to the weigh bin should result in a change in the readout. 1/10 of a gram is about four pellets, a gram about forty. This should hold true when the weigh bin is full as well as when it is empty.

Most load cell problems are caused by interference to the movement of the load cell. The load cell must be free to respond to the weight of a single pellet as well as free to move far enough to record full load cell rated weight deflection.

If weight readout is very erratic check for damage to the load cell wires. Check for a pinched wire in the connector.

An over-stressed load

cell will

read high. The top

limit is

(

3100.0)

for a GB/WSB2xx

and (

22444) for

GB/WSB4xx or GB/WSB9xx.

A load cell

that was forced

or pried upward

to

far will read (

0.0).

 

We supply and replace load cells in matched sets and we always include the mounting enclosures. You may remove the back plate from the enclosure for visual inspection. It is not safe to remove the load cell itself from the enclosure. To do so may stress the cell itself.

To operate with damaged load cells, see KEYPAD, *87, VOLUMETRIC.

To RECALIBRATE the LOAD CELLS, see the MAINTENANCE MANUAL.

For further information, see the next page, RAW SIGNAL READOUT, and Following page, LOAD CELL plus WEIGH BIN TEST.

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Contents Gravimetric Blenders Date Manual Number UGB006/1103 Serial numbers Model numbers Part Troubleshooting / Software Part Hardware MaintenanceFour Component Software Part OperationAssembly Instructions Check OUT ProcedureSpecial Features Proceed to Safety Hazards NextSafety Hazards MIX Blades Safety Features Safety Interlock SwitchProceed to Assembly Next Additional MIX Blade HazardDisclaimers Part Assembly Load Cells are Easily DamagedPlease Be Careful On the NextPage Wiring Considerations Proceed to Check OUT Procedure NextProcedure What should Happen Plug in Controller Turn Power onAT this Point Touch Weigh BIN Very LightlyPress Alarm KEY Press REG KEYLED # Press NAT KEYPage Password ExitPart Operation Load Cell Calibration Be SureCAL OFF CALProceed to Normal Operation Next OperOperate COLSelected Models Special Instructions Micro PulseGB/WSB MB GB/WSB 240RIf Problems Develop Power OFFPower on Instructions for Normal OperationNormal Operating Sequence Each Cycle Exit Regrind Eight Character Display ROM OKRight Column Alarms Strobe Light and Beeper AlarmsAlarm Silence LED LightsMixer Motor ON/OFF/TIMED Switch Mixer Motor OutletMixer Motor Fuse Internal Fuses KeypadDate Keypad Automatic Operation Mode RecipeRUN RCPSave BtchTABLE, FLG Page Fast TAGKeypad Manual Mode ALLTimed Time ADDPage Keypad Program Mode Para Star FunctionsYLD Ctrl Page Page Page Page Page Page Page Page Parameters Parameter List Brief ExplanationsMIX Time XXX RLO Page CPL Full Explanation of Parameters No ALARM, no Retries MPOMIX KDF / WDF BERPage ROV Page Example RHL is Set 10 percent Page Setting SETPage Page Page Page Page XCV + XRC TCV + TRCXTP XAL XULPTD LIQMCT Page Parameter Default Settings Four Software FLG RPO NPO CPOAPO MPO RAL NAL CAL AAL MIX JOGNPT CPT APT RWT RTINWT NTIChanging Parameters Prnt OFF PrntREG Natural COL TotalFinal DISP,% What to Check for Page Page Page Special Tests TimeTime Natural Calibrate NaturalMaterial Usage Information PARAMETER, PRTDate Time Totals Grand PCT Current Cycles Last Printed 11/01/90Part IV Troubleshooting What to do Increasing Throughput Typical Problems Page Normal Operating Sequence Material Runs OUT Verifying Load Cell Function Load Cell RAW Signal Readout CNT OFFCNT Results to Expect Clear Routine Clear ALL RestartCore Dump Weigh BIN Dump Valve Soft Close Clean OUT Issues MIX Problems Page Recalibration of Load Cells ZeroWait FullBlender Preventive Maintenance Dispense GatesLoad Cells Weigh BinsThese Instructions for Totalizers only Special Totalizer Function Stop END of CycleBlender TotalizeComputer Outputs Wiring Supplement Call Appendix A-2 Specifications Gravimetric Batch Blenders Autoweigh GBM Series ModelsGravimetric Batch Blenders AutoWeigh GB100 Series Models TOP View Front View Side View120V/1 phase/50-60 Hz 240V/1 phase/50-60 Hz Gravimetric Batch Blenders GB 220 and 420 ModelsGravimetric Batch Blenders AutoWeigh GB240 and GB440 Models TOP View Mounting InterfaceGravimetric Batch Blenders AutoWeigh GB900 Series Models 2124Gravimetric Batch Blenders AutoWeigh GB1840 and 1860 Models GB1840 GB1860Gravimetric Batch Blenders Wsbm Series models Control Remote Mounted Models WSBM22 WSBM131 WSBM140Gravimetric Batch Blenders WSB 100 and 100R Models Side View Front View Side View, R Model Front View, R ModelGravimetric Batch Blenders WSB 220 and 420 Models 24.4Gravimetric Batch Blenders WSB 240/440 and 240/440R Models WSB442Gravimetric Batch Blenders WSB 1840, 1850 and 1860 Models Appendix C Appendix C Appendix C Appendix C Appendix C Appendix C Appendix C Appendix C