OHAUS Valor 1000 Series Service Manual
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- Service manual (35 pages)
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Summary of Contents for OHAUS Valor 1000 Series
- Page 1 SERVICE MANUAL ™ Valor 1000 Scales Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...
- Page 3 ™ 1000 Scales The information contained in this manual is believed 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.
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Page 5: Table Of Contents
4.4.3 Linearity Test......................4-5 4.4.4 Off-Center Load Test..................4-5 4.4.5 Adjusting Off Center Load ..................4-6 CHAPTER 5 DRAWINGS AND PARTS LISTS Valor 1000 Scales: Housing & Internal Parts.............5-2 Appendix A STANDARD CALIBRATION Calibration......................... A-1 Setup and Calibration ....................!-2 Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual... - Page 6 Gap position of corners A, B,C, D .................3-5 Rechargeable battery ....................3-6 Segment Display ....................4-1 Scale drawing of Valor 1000 Load Cell and Weighing Pan........4-6 Valor 1000 Scales: Housing & Internal Parts ............5-2 Main PCB’s Menu Lock Jumper must be ON to calibrate ........A-1 Valor™...
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Page 7: Chapter 1 Getting Started
INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Valor 1000 Series scales. Familiarity with the scale’s Instruction Manual is assumed. The contents of this manual are contained in five chapters: Chapter 1 Getting Started – Contains information on service facilities, tools and test equipment, specifications, and the mechanical and electronic functions of the scale. -
Page 8: Tools And Test Equipment Required
3. Digital Voltmeter (DVM) capable of reading from 1 mv to 50 V dc.) SPECIFICATIONS Complete specifications for the Ohaus Valor 1000 Scales are listed in Table 1-2. When a scale has been serviced, it must meet the specifications listed in the table. Before servicing the scale, determine what specifications are not met. -
Page 9: Scale Operation
To turn the scale off, toggle the same switch to the off position. The Valor 1000 can operate on either AC Power, with the included AC adapter, or on the internal rechargeable battery. The scale automatically switches to battery operation if power fails while the scale is on. -
Page 10: Strain Gauge Load Cell
HOW LOAD CELLS OPERATE Load Cells are devices that convert force into a signal. The Valor 1000 has a Strain Gauge Load Cell, which is made from a metal beam with holes drilled in it. Strain gauges are affixed to the beam at the top and bottom to measure changes in the beam due to deflection. -
Page 11: Route Of Electrical Load Cell Input And Output Through Wheatstone Bridge
0.02mV per kg change in the load, that is, 10mV/500=0.02mV per kg. At a load of 250kg the signal voltage would thus increase by 5mV from the value measured at no load. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... - Page 12 CHAPTER 1 GETTING STARTED Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual...
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Page 13: Chapter 2 Troubleshooting
NOTE: If more than one symptom is observed, approach one area at a time, and remember that the symptoms may be interrelated. If a problem arises that is not covered in this manual, contact Ohaus Corporation for further information. 2.2.2 Checking Load Cells for Trouble 1. -
Page 14: Load Cell Resistance Readings (In Ohms)
The EXE+ and EXE– wires should be connected to the PCB, and the SIG+ and SIG– wires should be disconnected. Record the colors for each wire connection before disconnecting. (See Table 2-2 for typical color code for Valor 1000.) TABLE 2-2. COLOR CODE FOR LOAD CELL WIRING*... -
Page 15: Load Cell Output Readings (In Mv With 5V Excitation)
0.9 ± 2.0 Zero + 3.4 Zero + 5.9 V11P15 / 15kg 0.6 ± 2.0 Zero ± 3.2 Zero ± 5.9 0.3 ± 2.0 Zero + 2.8 Zero + 5.4 V11P30 / 30kg Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 16: Diagnostic Guide
Remove the cover from the load adjustment. cell. Check the Overload Stops. (See Section 3.7.) If OK, the load cell is defective. Load Cell defective. Replace the Load Cell. (See Section 3.6.) Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual... - Page 17 Underload during power on Install pan and re-zero. -----L -Over- Weight on pan exceeds Remove weight from pan. capacity Err-1 Invalid under and over limit Re-enter under and over limits. settings Calibrate the scale. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com...
- Page 18 CHAPTER 2 DIAGNOSTIC GUIDE Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual...
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Page 19: Chapter 3 Maintenance Procedures
5. Make a visual inspection for faulty connectors, wiring, and loose hardware. SERVICE STRATEGY All parts of the Valor 1000 are designed to be replaced rather than repaired. This includes the Main Printed Circuit Board (PCB) and Switches PCB, the Load Cell, and the cables. For an illustrated list of replaceable parts, see Chapter 5. -
Page 20: Separating The Top And Bottom Housings
3.3.1 Separating the Top and Bottom Housings Common hand tools are sufficient to disassemble the Valor 1000 scales. Turn the scale off and unplug the power cord before you begin. 1. Lift off the Weighing Pan from the Pan Support. -
Page 21: Removing/Replacing The Main Pcb And Switches Pcb
6. Re-connect the Cable connecting the Main PCB to the scale’s power system. (See Figure 3-2.) 7. Insert and tighten the screws that secure each PCB to the Top Housing. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 22: Removing/Replacing The Load Cell
8. Solder the cable leads connecting the Load Cell to the PCB. (See Figure 3-2.) TABLE 3-1. MOUNTING BOLT TORQUE SETTINGS MODEL TORQUE SETTING V11P3 12~13Nm V11P6 13~14Nm V11P15 14~15Nm V11P30 15~16Nm 9. Set Overload Stops as shown in Section 3.6. Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual... -
Page 23: Setting The Overload Stops
2. Repeat this for all four corners. Figure 3-4. Overload Stops on Valor 1000. 3. Test the scale to see if full capacity can be achieved. TABLE 3-2. VALOR 1000 OVERLOAD STOP GAP SETTINGS Model Max. Capacity Overload Stop Gap... -
Page 24: Removing/Replacing The Battery
CHAPTER 3 MAINTENANCE PROCEDURES Removing/Replacing the Rechargeable Battery The Valor 1000 has a rechargeable battery. If it fails to recharge, replace it as follows: 1. Remove the four screws in its cover, and lift off the cover. 2. Lift the battery’s front end enough to access the quick-connect tabs holding the wire leads. -
Page 25: Chapter 4 Testing
4.1.1 TEST MASSES REQUIRED The masses required to test the Ohaus Valor 1000 scales must meet the requirements of ASTM Class 4 or OIML F2 Tolerance. The mass values are listed in Table 4-1. TABLE 4-1. TEST MASS VALUES... -
Page 26: Performance Tests
CHAPTER 4 TESTING Performance Tests Accurate performance of the Valor 1000 scales is determined by a series of four performance tests. The displayed readings are compared with the tolerances listed for each test in Table 1-2. Tolerance values are expressed in counts. A one-count difference is shown in the last digit on the scale display. -
Page 27: Repeatability Test
3. Remove the mass from the platform. 4. Repeat this test starting at Step 1 until you record a total of ten readings Fill in the worksheet (Table 4-2) with the ten (10) readings. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 28: Repeatability Worksheet
Calculate the Standard Deviation by applying the square root of the result from step 8. Standard Deviation =___________ Note: If the balance does not meet specifications, move it to a suitable location, ensure that it is level, and try again. Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual... -
Page 29: Linearity Test
5. Maximum allowable change in displayed weight readings for each of the four positions can be found in Tables 1-1 and 1-2 (Specifications, page 1-2 and 1-3). If this maximum is exceeded, follow procedures in Section 4.4.5, Adjusting Off Center Load. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 30: Adjusting Off Center Load
Weighing Pan’s center, with points A – D indicated Figure 4-2. Scale drawing of Valor 1000 Load Cell and Weighing Pan. 1. Place the test weight in the center of the Weighing Pan. 2. Tare the balance. 3. Move the weight to point A and record the reading. - Page 31 CHAPTER 5 PARTS LISTS & DIAGRAMS This section of the manual contains exploded views of the Valor 1000 scales. The exploded view drawings are designed to identify the parts which can be serviced on the scale in the field. NOTE: In all cases where a part is replaced, the scale must be thoroughly checked after the replacement is made.
- Page 32 CHAPTER 5 PARTS LISTS & DIAGRAMS VALOR 1000 SCALES: HOUSING & INTERNAL PARTS Figure 5-1. Valor 1000 Scales: Housing & Internal Parts. Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual...
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Page 33: Valor 1000 Scales: Housing & Internal Parts
Level Bubble Bottom Housing Wiring Harnesses & On/Off Switch Adjustable Feet, Set of 4 Rechargeable Battery Battery Cover Hardware Kit Adapter Note: For parts numbers, see your local Ohaus distributor, or visit www.ohaus.com. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... - Page 34 CHAPTER 5 PARTS LISTS & DIAGRAMS Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual...
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Page 35: Appendix A Standard Calibration Calibration
3. Press ZERO to display F 3.000. Note: Calibration weight is 3 kg (3000 g) for all models: DO NOT CHANGE. Put the displayed weight on the scale, and press ZERO to accept. After completion, scale will be in weighing mode. Valor™ 1000 Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 36: Setup And Calibration
Note: Span weight is 3000 g (3 kg) for all models: DO NOT CHANGE. Put displayed weight on the scale, and press ZERO to accept. After completion, scale will be in weighing mode. Ohaus Corporation www.ohaus.com Valor™ 1000 Series Service Manual... - Page 38 *80252599* P/N 80252599 SERVICE MANUAL: Valor 1000 SERIES SCALES...
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