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CHAPTER 4 TESTING

4.5.3 Linearity

Test

This test is used to determine the linearity of the unit throughout its operating range.
The masses used to perform this test can be utility masses.

NOTE:

The scale must pass the Precision and Repeatability Tests, and be calibrated before
the Linearity Test may be performed.

TABLE 4-4. LINEARITY TEST MASSES

Capacity (g)

200 x 0.01

2000 x 0.1

3000 x 1

6000 x 1

300 x 0.2 IP

3000 x 1 IP

6000 x 2 IP

Reference Wt.

500

750

1500

750

1500

Load 1

500

750

1500

750

1500

Load 2

100

1000

1500

3000

150 1500

3000

Load 3

150

1500

2250

4500

225

2250

4500

NOTE:

All masses are nominal values. Be certain to use the same reference mass throughout
the procedure.

1. Place the test mass on the Scale, record the weight and remove.

2. Place Load 1 on the Scale and press TARE.

3. Place the test mass on the Scale, record the weight and remove.

4. Place Load 2 on the Scale and press TARE.

5. Place the test mass on the Scale, record the weight and remove.

6. Place Load 3 on the Scale and press TARE.

7. Place the test mass on the Scale and record the weight.

8. The difference in the weights of the test mass should be within the tolerance in Table

4-1. If not, calibrate (see Appendix A.1) and repeat the test.

9. If the Scale remains out of tolerance, the Load Cell may need to be replaced.

4.5.4 Off-Center

Load

Test

The Off-Center Load Test is used to determine whether displayed weight values are affected by
moving the sample to different areas of the Pan.

1. Place half of the scale’s capacity in the center of the Pan.

2. Note the reading.

3. Move the mass halfway (between the center and the edge) to the front of the Pan.

Note any differences in the displayed weight reading.

4. Repeat the test for the back, left, and right position of the Pan.

5. Maximum allowable change in displayed weight readings for each of the four

positions can be found in Specifications Tables (Chapter 1). If this maximum is
exceeded, follow procedures in Section 4.5.5, Adjusting Off Center Load.

Valor™ 3000 Series Service Manual

4-5

Ohaus Corporation www.ohaus.com

Содержание Valor 3000

Страница 1: ...SERVICE MANUAL Valor Valor Valor Valor 3000 SCALES Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 973 377 9000...

Страница 2: ......

Страница 3: ...te 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 Material in this manual is...

Страница 4: ......

Страница 5: ...ve Maintenance 3 1 3 1 1 Preventive Maintenance Checklist 3 1 3 2 Opening the Scale 3 1 3 2 1 Opening Valor 3000 Standard and Washable Models 3 2 3 3 Replacing the Load Cell 3 3 3 4 Replacing the Prin...

Страница 6: ...1 7 2 1 Diagnostic Guide 2 2 4 1 Calibration Mass Values 1 2 4 2 Tolerances 4 2 4 3 Repeatability Worksheet 4 4 4 4 Linearity Test Masses 4 5 5 1 Valor 3000 Xtreme Scales Housing Internal Parts 5 3 5...

Страница 7: ...nal Parts 5 2 5 2 Valor 3000 Xtreme W Scales Housing Internal Parts 5 4 C 1 RS232 Interface connected to Service Interface connected to the PCB C 1 C 2 Service Interface fits into the RS232 Interface...

Страница 8: ...TABLE OF CONTENTS Valor 3000 Series Service Manual iv Ohaus Corporation www ohaus com...

Страница 9: ...bration Describes the Service Menu and sub menus which allow authorized service personnel to perform factory Linearity and Span calibrations no pre set limits take Ramp readings adjust the GEO Factor...

Страница 10: ...3000 6000 300 3000 6000 Repeatability g 0 01 0 1 1 0 2 1 2 Linearity g 0 01 0 1 1 0 2 1 2 Weighing Units g kg lb oz lb oz Application Modes Weigh Percent weighing Specific Gravity Fluid Ounces Tare r...

Страница 11: ...0 0005 6 615 x 0 005 13 225 x 0 005 lb 0 44090 x 0 00005 4 4090 x 0 0005 6 615 x 0 005 13 230 x 0 005 OFF 0 6615 x 0 0005 6 615 x 0 002 13 225 x 0 005 NA NA NA NA ON NA 6 lb 9 80 oz x 0 05 oz 13 lb 3...

Страница 12: ...e 1 2 Valor 3000 Xtreme Xtreme W Displays TABLE 1 3 FUNCTIONS OF DISPLAY CONTROLS Button Action Functions Turns scale on Sets display to zero Tares weight of item on pan Turns scale off O T On Off Sho...

Страница 13: ...erent temperature than the area where it is to be operated Allow one hour for each 5 F 2 7 C temperature change before using the scale After temperature stabilization allow an additional 20 minutes af...

Страница 14: ...ssible values are from 1 to 31 The setting is in the Service Menu press O T Off and MODE UNITMenu simultaneously during power on Press No three times until GEO appears then press Yes Then continuously...

Страница 15: ...Manual TABLE 1 5 VALOR 3000 MENU STRUCTURE SETUP Press and hold MODE UNIT Menu until SETUP appears Press Yes UNIT appears after pressing Yes to end SETUP menu Press Yes Stability Automatic Zero Track...

Страница 16: ...CHAPTER 1 GETTING STARTED Ohaus Corporation www ohaus com 1 8 Valor 3000 Series Service Manual...

Страница 17: ...e problem proceed to the next remedy Before attempting to repair the scale read all chapters of this manual to be familiar with the scale components and operation 2 2 1 Diagnosis 1 Isolate and identif...

Страница 18: ...Service Menu run RAMP to check Load Cell Then calibrate Replace Load Cell Err 8 2 Pan was removed prior to power on Zero has shifted Load Cell is damaged Install pan and re zero In Service Menu run RA...

Страница 19: ...ectronics to stabilize 3 1 1 Preventive Maintenance Checklist The scale should be inspected and checked regularly as follows 1 Remove the Pan and Sub Pan to inspect and clean the area beneath the Pan...

Страница 20: ...a tamper evident seal used in Legal For Trade application See Section 1 8 for more details Figure 3 1 Proper way to lift off Seal Figure 3 2 Scale Bottom Valor 3000XW 4 Replace a screw without tighte...

Страница 21: ...the scale back on its feet and gently lift off the Load Cell Unlocked position on red Shipping Lock 5 If the Load Cell is malfunctioning replace it 6 Before installing the replacement Load Cell check...

Страница 22: ...ps in reverse order to install the new PCB 5 Turn the scale on Err 9 will appear This is normal 6 Configure the Scale See Appendix C Note The PCB and the LCD Display are supplied as a single unit Howe...

Страница 23: ...hat hold it 5 Re install the leveling feet and then mount the Bottom Plate Gasket Figure 3 7 Bottom Plate Gasket and Seal 6 Turn the scale over and replace the seal washers in the holes of the screws...

Страница 24: ...the old one was See Figure 3 8 Figure 3 8 Plastic Insert and Function Label 3 7 Replacing the Plastic Insert Function Label Plastic Insert The Plastic Insert also may need to be replaced See Chapter 5...

Страница 25: ...Tolerance The mass values are listed in Table 4 1 TABLE 4 1 CALIBRATION MASS VALUES MODELS V31XH202 V31XH2 V31X3 V31X6 V31XW301 V31XW3 V31XW6 Calibration Weights 200g 2 kg 3 kg 6 kg 300 g 3 kg 6 kg 4...

Страница 26: ...2 1 Power on the balance The reading on the display should be 0g 2 Select a mass weighing near the maximum capacity of the balance and place it on the center of the Pan Observe and record the reading...

Страница 27: ...Zero Tracking to 5d or its lowest setting Do not turn it off D Set the instrument to display the same units as the performance specifications Usually kg g or mg Record Settings Stability Setting ____...

Страница 28: ...an ________ 6 Calculate the Delta for each reading and record in the work sheet Delta Reading Mean 7 Calculate the Delta x Delta for each reading and record in worksheet 8 Add the ten Delta x Delta va...

Страница 29: ...st mass on the Scale record the weight and remove 6 Place Load 3 on the Scale and press TARE 7 Place the test mass on the Scale and record the weight 8 The difference in the weights of the test mass s...

Страница 30: ...and record the reading 6 Move the weight 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 p...

Страница 31: ...ghly checked after the replacement is made The scale MUST meet the parameters of all applicable specifications in this manual If further technical information is needed please contact your local Ohaus...

Страница 32: ...VALOR 3000 XTREME SCALES HOUSING INTERNAL PARTS 3 5 6 7 8 8 10 16 11 12 80 15 13 14 16 4 2b 1b 2a 8 1a 16 Figure 5 1 Valor 3000 Xtreme Scales Housing Internal Parts Ohaus Corporation www ohaus com 5...

Страница 33: ...Round 120mm 2b Pan Support Round 3 Plastic insert Non IP 4 Function Label without Level 5 Housing Top Ex IP Model No Labels 6 Load Cell 7 Housing Bottom 8 Seal Kit Housing 10 Housing Bottom Plate No...

Страница 34: ...5 PARTS LISTS DIAGRAMS 5 2 VALOR 3000 XTREME W SCALES HOUSING INTERNAL PARTS Figure 5 5 Valor 3000 Xtreme W Scales Housing Internal Parts Ohaus Corporation www ohaus com 5 4 Valor 3000 Series Service...

Страница 35: ...3 Load Cell Seal Kit IP Models 4 Function Label Level 5 Housing Top IP Models No Labels 6 Load Cell 6000g 7 Housing Bottom 8 Seal Kit Housing 10 Housing Bottom Plate LFT 11 Feet 4 Adjustable 12 Batter...

Страница 36: ...CHAPTER 5 PARTS LISTS DIAGRAMS Ohaus Corporation www ohaus com 5 6 Valor 3000 Series Service Manual...

Страница 37: ...l 2 Press Yes CAL appears followed by a flashing C while a zero reading is stored C 3 The specified calibration weight value appears Place the weight on the pan The display shows C while the reading i...

Страница 38: ...APPENDIX A STANDARD CALIBRATION Ohaus Corporation www ohaus com A 2 Valor 3000 Series Service Manual...

Страница 39: ...ue is not as important as how it changes It should increase as the weight on the scale is increased The ramp display should remain constant without fluctuations If you press Yes to select Ramp a numbe...

Страница 40: ...enu returns to LIN Cal E Pressing Yes after placing the prompted weight accepts the linearity mid point weight The display shows C while the scale acquires the weight reading After the mid point value...

Страница 41: ...in the center of the Pan 200 If the target weight is not placed on the pan within 10 seconds error CAL E appears for 3 seconds and the menu returns to SPAN Start again Cal e Pressing Yes after placing...

Страница 42: ...n where the scale is to be used If required the scale may also be sealed according to the required approval regulations NOTE Only an authorized manufacturer s representative or certified verification...

Страница 43: ...E PAND appears Press Yes to enter the E PAND setting menu E PAND appears again Press Yes to turn it on ON appears Pressing Yes again accepts the setting Pressing No causes OFF to appear In either case...

Страница 44: ...APPENDIX B THE SERVICE MENU Ohaus Corporation www ohaus com B 6 Valor 3000 Series Service Manual...

Страница 45: ...FF If this setting is left ON the scale will shut off during configuration 2 To connect the scale to a personal computer use the hardware interface See Figures C 1 and C 2 RS232 Interface and Cable PN...

Страница 46: ...click Check Scale Figure C 3 First screen of Configtool exe 7 Click COM port for Communication setup Figure C 4 Com Port Configuration screen with correct settings 8 The communications parameters shou...

Страница 47: ...com C 1 Hardware and Software Setup continued 9 Click the Test Command tab to test the communications See Figure C 4 Figure C 5 Config Tool s Test Command screen Enter a P command The scale should re...

Страница 48: ...rial number in the blank C then click Scale in the Serial Number box A and click OK D When the OK button highlights again click Update F Turn the scale off and then back on to save the data Figure C 6...

Страница 49: ...5 16 16 17 17 18 18 19 19 20 20 21 21 22 22 04 05 05 06 06 07 07 08 08 09 09 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 04 04 05 05 06 06 07 07 08 08 09 09 10 10 11 11...

Страница 50: ...55 66 24 66 24 67 57 67 57 69 35 69 35 71 21 71 21 73 16 73 16 75 24 75 24 77 52 77 52 80 56 80 56 85 45 85 45 90 00 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 22 23 23 24 24 25 25 26 26 27 27...

Страница 51: ......

Страница 52: ...80252591 P N 80152591 SERVICE MANUAL Valor 3000 SERIES SCALES...

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