Conair WSB, GB manual Verifying Load Cell Function

Page 86

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 of each other.

The addition of several pellets to the weigh bin should result in a change in the readout. 1 gram is about 40 pellets.

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 a full 20,000 gram weight deflection. (10,000 grams per cell - 10K cells)

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 200 series

or (

31000) for a

400 or 900 series.

A load cell

that was forced or pried upward

too 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 in a VOLUMETRIC mode, see KEYPAD, *87, Volumetric mode.

To RECALIBRATE the LOAD CELLS, see the HARDWARE MAINTENANCE section.

If you suspect load cell damage or failure, see:

LOAD CELL RAW SIGNAL READOUT, next page, and

LOAD CELL - WEIGH BIN TEST, the following page.

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Contents Gravimetric Blenders Date Manual Number UGB007/1103 Serial numbers Model numbers Twelve Component Software Part Troubleshooting / SoftwarePart Hardware Maintenance Part OperationProceed to Safety Hazards Next Check OUT ProcedureSpecial Features Slide ValvesProceed to Assembly Next Safety Hazards MIX BladesSafety Features Safety Interlock Switch Additional MIX Blade HazardDisclaimers Part I Assembly Page Wiring Considerations Proceed to Check OUT Procedure NextAT this Point Procedure What should Happen Plug in ControllerTurn Power on Touch Weigh BIN Very LightlyALL Models Press Alarm KEYFacing the Controller Side of the Blender Press Dump KEYPage Selecting Correct Model Weigh BIN Load Cell Grams Dimensions Rating GBMPassword Model Batch WTCAL Part II Operation Load Cell CalibrationCAL OFF ZeroNatural Ratio to Each Other Turning on Outputs Material TypesRegrind Percent of MIX Natural SET= Additive Percent of ALL NaturalsRegrind On the Other HandTypes Proceed to Rate Calibration NextOper Proceed to Entering Settings NextRate Calibration YOU Dont have to do this OperateEntire MIX Other Natural SettingsSET Thumbwheel Assignments this is OptionalGB/WSB GBM Selected Models Special InstructionsMicro Pulse GB/WSB 240RInstructions for Normal Operation Power OFFPower on After Several Days of Proper OperationNormal Operating Sequence Each Cycle Wait 5 seconds, until display says Press Display will say Eight Character Display ROM OK Strobe Light and Beeper AlarmsAlarm Silence LED LightsMixer Motor ON/OFF/TIMED Switch Mixer Motor OutletThumbwheel Switches Internal FusesKeypad Summary Description Total Keypad Automatic Operation ModeKeypad Description of Functions RecipeBatch BtchBatch Count FastTAG OperatorKeypad Manual Mode Timed TimePage Keypad Program Mode Para FLG 1TY 2TY 3TY CTY MIX 1CS 2CS 3CSTRC ViewYLD Ctrl Page Explanation EepromPage Page Page Page Page Page MIX Time ParametersParameter List Brief Explanations Page Component Parameters OFF Designates Material TypePage Parameter List Full Explanations FLGJOG KDF, WDF ROV Page Page Dispense Station Configuration Tare Weight STL Do not Change TheseXTP XCV + XRCTCV + TRC CPL XALXUL MCT MPOLIQ REG = Regrind NAT = Natural ADD = Additive OFF =Not Used Page Page Page Page Page Page FCV DTI KDF WDF BER Parameter Default Settings Twelve SoftwareFLG MIX JOG ROC ROV RHL FUL1LA 1PO 1TY = OFF 1CS 1AL 1XT 1SE1MI 1NC 1PT 1RP 1RD 3TY 3CS 3AL 3XT 3SE 3WTChanging Parameters Final DISP,% Prnt OFFPrnt Rate GR/TIMEFinal DISP,% What to Check for Page Page Page Calibrate Comp Special TestsTime Comp Date Time Current Material Usage InformationPARAMETER, PRT Last PrintedPart IV Troubleshooting What to do Typical Problems Page Normal Operating Sequence Material Runs OUT Verifying Load Cell Function CNT Load Cell RAW Signal ReadoutCNT OFF Load Cell Weigh BIN Test Results to ExpectCore Dump Clear RoutineClear ALL Restart Internal MIX Motor Level SensorWeigh BIN Dump Valve MIX Problems Page Recalibration of Load Cells FullLoad Cells Blender Preventive MaintenanceDispense Gates Weigh BinsPage Computer Outputs Wiring Supplement Page 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

GB, WSB specifications

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