OHAUS Defender D15HR, Service Manual

Page 1: ...SERVICE MANUAL Defender Bases Rectangular H Series Square Q Series Square Washdown W series Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 973 377 9000...

Page 2: ......

Page 3: ...elieved to be accurate at the time of publication but Ohaus Corporation assumes no liability arising from the use or misuse of this material Reproduction of this material is strictly prohibited Materi...

Page 4: ......

Page 5: ...onsistency Check 4 2 4 5 Performance Tests 4 2 4 5 1 Off Center Load Shift Test 4 3 4 5 2 Adjusting Off Center Load 4 4 4 5 3 Full Load Test 4 5 CHAPTER 5 DRAWINGS AND PARTS LISTS 5 1 Defender H Q W B...

Page 6: ...Top Frame to the Load Cell 3 1 3 2 Four Mounting Bolts that secure the Bottom Frame to the Load Cell 3 2 3 3 Overload Gap Setting 3 2 3 4 Location of top Overload Stops 3 2 3 5 Location of bottom Over...

Page 7: ...intenance Procedures Contains preventive maintenance procedures and disassembly repair and replacement procedures Chapter 4 Testing Contains guides for operational and performance tests and adjustment...

Page 8: ...hardware Each base contains the following basic replaceable assemblies Platform Load Cell with Connecting Cable and Down Stop and mounting hardware There is an exploded view drawing of the Base and as...

Page 9: ...tput Resistance 410 10 ohms 350 4 ohms Operating Temperature 14 F to 104 F 10 C to 40 C Shift Tolerance new 1d Shift Tolerance Maint 2d Base Dimensions 12 x 14 in 30 5 x 35 5 cm TABLE 1 2 SPECIFICATIO...

Page 10: ...lerance Maint 2d Base Dimensions 12 x 12 in 305 x 305 mm 18 x 18 in 457 x 457 mm TABLE 1 4 SPECIFICATIONS FOR DEFENDER SQUARE BASES Large MODEL Q Series D60QL D100QL D150QL D250QX D300QX Capacity 60 k...

Page 11: ...lerance Maint 2d Base Dimensions 12 x 12 in 305 x 305 mm 18 x 18 in 457 x 457 mm TABLE 1 6 SPECIFICATIONS FOR DEFENDER SQUARE WASHDOWN BASES Large MODEL W Series D60WL D100WL D150WL D250WX D300WX Capa...

Page 12: ...to Platform Strain Gauges Beam Printed Circuit Board completing Wheatstone Bridge circuit Holes drilled in Strain Gauge Load Cell Figure 1 1 Strain Gauge Load Cell The strain gauges are wired into a W...

Page 13: ...l is read by the Indicator which converts it to a numeric value and shows it visually This output value increases as weight is loaded to the Load Cell For example a 500kg Load Cell with 2mV V output a...

Page 14: ...CHAPTER 1 INTRODUCTION Ohaus Corporation www ohaus com 1 8 Defender H Q W Series Service Manual...

Page 15: ...ict movement causing improper operation of the Base If the Overload Stops are improperly set adjust them See Section 3 3 Check the metal surfaces of the Platform All surfaces should be parallel If the...

Page 16: ...CHAPTER 2 DIAGNOSTIC GUIDE Ohaus Corporation www ohaus com 2 2 Defender H Q W Series Service Manual...

Page 17: ...base 2 Remove the Platform to inspect and clean the area beneath the Platform CAUTION DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE BASE S FINISH...

Page 18: ...Adjustments The Overload Stop gaps must be checked and reset if the Load Cell is replaced 1 Remove the Platform and loosen the Jam Nuts first on the four Overload Stops on the top side of the Frame t...

Page 19: ...HR 2mm 0 78in 0 5mm 0 02in D30HR 2mm 0 78in 0 5mm 0 02in D60HR 3mm 0 118in 0 5mm 0 02in D60HL 3mm 0 118in 0 75mm 0 03in D100HL 3mm 0 118in 0 75mm 0 03in D150HX 4mm 0 157in 1mm 0 04in D300HX 4mm 0 157i...

Page 20: ...CHAPTER 3 MAINTENANCE AND REPAIR PROCEDURES Ohaus Corporation www ohaus com 3 4 Defender H Q W Series Service Manual...

Page 21: ...no load when these tests are made Note The cable fitting for the H and Q series Bases has seven pins as shown in Figure 4 1 Pin 1 is EX Pin 3 is S Pin 5 is S Pin 7 is EX The wires are color coded on...

Page 22: ...the following measurements Also make these checks if the Load Cell will not calibrate or if the Indicator does not read correctly or is giving unstable readings 1 Using a voltmeter measure and record...

Page 23: ...5 4 D150HR 150kg 0 53 2 0 Zero 2 5 Zero 5 D300HL 300kg 0 34 2 0 Zero 3 Zero 6 D10QR 10kg 4 3 2 0 Zero 2 3 Zero 4 7 D25QR 25kg 1 6 2 0 Zero 2 8 Zero 5 6 D50QR 50kg 1 7 2 0 Zero 2 4 Zero 4 8 D100QL 100k...

Page 24: ...at all sections of the Base weigh within specified tolerance If the Base does not pass the Shift Test verify that the Overload Stops are properly set See Section 3 1 If the Shift Test cannot be passed...

Page 25: ...ight to point D and record the reading 7 If the reading at point A is negative file at points 1 and 4 AT AN ANGLE 8 If the reading at point B is negative file at points 1 and 2 STRAIGHT ACROSS 9 If th...

Page 26: ...st the Base s full capacity according to the Specification Tables 1 1 through 1 6 The Base must meet all specifications as listed 2 If the Base fails the Full Load Test check and set the Overload Stop...

Page 27: ...cked after the replacement is made The base MUST meet the parameters of all applicable specifications in this manual If further technical information is needed please contact your local Ohaus office o...

Page 28: ...CHAPTER 5 PARTS LISTS DIAGRAMS 5 1 DEFENDER RECTANGULAR H BASES PARTS Figure 5 1 Defender Rectangular H Bases Parts Ohaus Corporation www ohaus com 5 2 Defender H Q W Series Service Manual...

Page 29: ...Load Pad 4 Overload Stop Jam Nuts and Set Screws 5 Load Cell Mounting Bolt 6 Load Cell 7 Load Cell Mounting Washers 8 Level Kit 9 Leveling Feet When replacement parts are needed refer to the spare pa...

Page 30: ...TER 5 PARTS LISTS DIAGRAMS 5 2 DEFENDER SQUARE Q W BASES PARTS 1 4 5 4 3 2 6 8 5 4 9 7 7 Figure 5 2 Defender Square Q W Bases Parts Ohaus Corporation www ohaus com 5 4 Defender H Q W Series Service Ma...

Page 31: ...SES PARTS Drawing Item Description 1 Pan 2 Rubber Center Load Pad 3 Rubber Corner Load Pad 4 Overload Stop Jam Nuts and Set Screws 5 Load Cell Mounting Bolt 6 Load Cell 7 Load Cell Mounting Washers 8...

Page 32: ...CHAPTER 5 PARTS LISTS DIAGRAMS Ohaus Corporation www ohaus com 5 6 Defender H Q W Series Service Manual...

Page 33: ...Over the full rated capacity of the load cell the mV output will change The amount by which it changes depends upon the resistance change in the cell and on the excitation voltage applied Since the lo...

Page 34: ...APPENDIX A GLOSSARY Ohaus Corporation www ohaus com A 2 Defender H Q W Series Service Manual...

Page 35: ......

Page 36: ...80252596 P N 80252596 SERVICE MANUAL DEFENDER H Q W SERIES BASES...