OHAUS Valor 1000 User manual

SERVICE MANUAL
Valor™1000 Scales
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 [phone]

SERVICE MANUAL
Valor™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.
Material in this manual is subject to change.
© Copyright 2008 Ohaus Corporation, all rights reserved.
TM Registered trademark of Ohaus Corporation.

TABLE OF CONTENTS
Page No.
CHAPTER 1 GETTING STARTED
1.1 Introduction................................................................................................................1-1
1.2 Service Facilities........................................................................................................1-1
1.3 Tools and Test Equipment Required.........................................................................1-2
1.4 Specifications.............................................................................................................1-2
1.5 Scale Operation.........................................................................................................1-3
1.5.1 Overview of the Controls....................................................................................1-3
1.5.2 Power On ...........................................................................................................1-4
1.5.4 Power Off ...........................................................................................................1-4
CHAPTER 2 TROUBLESHOOTING
2.1 Troubleshooting.........................................................................................................2-1
2.2 Diagnostic Guide .......................................................................................................2-1
2.2.1 Diagnosis............................................................................................................2-1
2.2.2 Checking Load Cells for Trouble........................................................................2-1
2.2.3 Diagnostic Guide................................................................................................2-4
CHAPTER 3 MAINTENANCE PROCEDURES
3.1 Preventive Maintenance............................................................................................3-1
3.1.1 Preventive Maintenance Checklist .....................................................................3-1
3.2 Service Strategy ........................................................................................................3-1
3.3 Opening the Scale.....................................................................................................3-1
3.2.1 Separating the Top and Bottom Housings..........................................................3-2
3.4 Removing/Replacing the Main PCB and Switches PCB............................................3-3
3.5 Removing/Replacing the Load Cell ...........................................................................3-4
3.6 Setting the Overload Stops........................................................................................3-5
3.7 Removing/Replacing the Battery...............................................................................3-6
3.8 Replacing the Fuse....................................................................................................3-6
3.9 Replacing the Function Label....................................................................................3-6
CHAPTER 4 TESTING
4.1. Testing.......................................................................................................................4-1
4.1.1 Test Masses Required .......................................................................................4-1
4.2 Operational Test........................................................................................................4-1
4.3 Segment Display Test................................................................................................4-1
4.4. Performance Tests ....................................................................................................4-2
4.4.1 Precision Test.....................................................................................................4-2
4.4.2 Repeatability Test...............................................................................................4-3
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
5-1 Valor 1000 Scales: Housing & Internal Parts.............................................................5-2
Appendix A STANDARD CALIBRATION
A.1 Calibration.................................................................................................................A-1
A.2 Setup and Calibration.................................................................................................!-2
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TABLE OF CONTENTS
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications (Standard Models)..........................................................................1-2
1-2 Specifications (NTEP Models)...............................................................................1-3
1-3 Functions of Display Controls................................................................................1-4
2-1 Load Cell Resistance Readings (in Ohms) ...........................................................2-2
2-2 Color Code for Load Cell Wiring............................................................................2-2
2-3 Load Cell Output Readings (in mV with 5V Excitation).........................................2-3
2-4 Diagnostic Guide...................................................................................................2-2
3-1 Mounting Bolt Torque Settings..............................................................................3-4
3-2 Valor 1000 Overload Stop Gap Settings...............................................................3-5
4-1 Calibration Mass Values........................................................................................4-1
4-2 Repeatability Worksheet .......................................................................................4-4
4-3 Linearity Test Masses ...........................................................................................4-5
5-1 Valor 1000 Scales: Housing & Internal Parts........................................................5-3
A-1 Initial Configuration Settings for Each Model ....................................................... A-2
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE
1-1. Valor 1000 Control Panel......................................................................................1-4
1-2 Strain Gauge Load Cell.........................................................................................1-5
1-3 Downward force on the Platform bends the beam................................................1-5
1-4 Route of electrical Load Cell input and output through Wheatstone Bridge..........1-6
2-1 Load Cell wire connections to Main PCB..............................................................2-3
3-1 Valor 1000 Bottom ................................................................................................3-2
3-2 Top and Bottom Housings.....................................................................................3-2
3-3 Removing bolts holding Frame to the Load Cell ...................................................3-4
3-4 Overload stops on Valor 1000...............................................................................3-5
3-5 Gap position of corners A, B,C, D.........................................................................3-5
3-6 Rechargeable battery............................................................................................3-6
4-1 Segment Display...................................................................................................4-1
4-2 Scale drawing of Valor 1000 Load Cell and Weighing Pan...................................4-6
5-1 Valor 1000 Scales: Housing & Internal Parts........................................................5-2
A-1 Main PCB’s Menu Lock Jumper must be ON to calibrate.................................... A-1
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CHAPTER 1 GETTING STARTED
1.1 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.
Chapter 2 Troubleshooting – Contains a diagnostic guide and error code table.
Chapter 3 Maintenance Procedures – Contains preventive maintenance procedures and
disassembly, repair and replacement procedures.
Chapter 4 Testing – Contains a list of required test masses, an operational test, segment
display test, performance tests and adjustments.
Chapter 5 Drawings and Parts Lists – Contains exploded views of Valor 1000 scales
identifying all serviceable components.
Appendix A Standard Calibration – Explains procedures for Standard Calibration, performed
prior to using a scale, and after service.
1.2 SERVICE FACILITIES
To service a scale, the service area should meet the following requirements:
•Should be temperature controlled and meet scale specifications for temperature
environmental requirements.
•Must be free of vibrations such as fork lift trucks close by, large motors, air currents or
drafts from air conditioning/heating ducts, open windows, people walking by, fans, etc.
•Area must be clean and free of excessive dust.
•Work surface must be stable and level.
•Scale must not be exposed to direct sunlight or radiating heat sources.
•Use an approved Electro-Static Device
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CHAPTER 1 GETTING STARTED
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
1. Common hand tools
2. Standard electronics tool kit
3. Digital Voltmeter (DVM) capable of reading from 1 mv to 50 V dc.)
1.4 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.
TABLE 1-1. SPECIFICATIONS
Model V11P3 V11P6 V11P15 V11P30
Capacity x Readability
Max x d
(non-approved)
3 kg x 0.0005 kg
3000 g x 0.5 g
6.6 lb x 0.001 lb
105 oz x 0.02 oz
6 kg x 0.001 kg
6000 g x 1 g
13 lb x 0.002 lb
210 oz x .05 oz
15 kg x 0.002 kg
15000 g x 2 g
33 lb x 0.01 lb
520 oz x 0.1 oz
30 kg x 0.005 kg
30000 g x 5 g
66 lb x 0.02 lb
1058 oz x 0.5 oz
Max displayed
resolution 1:7500d
Linearity ±2d
Off Center Load error ±2d
Repeatability ±2d
Hysteresis ±2d
Zero drift vs. temp. ±2 d / oC
Span drift vs. temp. ±2d / °C
Tare Range To Full Capacity by Subtraction
Stabilization Time ≤3 seconds
Auto Zero Tracking User selectable from 0.1d to 2d
Operating Temp.
range 0° to 40°C / 32° to 104°F
Storage Temp. range -10° to 60°C / 14° to 140°F
Humidity Range ≤90% relative humidity, non-condensing
Power 9VDC 700mA AC adapter / Internal rechargeable sealed lead acid battery
Battery Life 80/100 hours (with/without backlight on)
Pan Size (mm/in) 250 x 180 / 9.9 x 7.1
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CHAPTER 1 GETTING STARTED
1.5 SCALE OPERATION
This section contains information on the basic operation of the scale. Units of measure indicators:
pieces (not used), pounds,
ounces, Kilograms
1.5.1 OVERVIEW OF THE CONTROLS
7-segment, 6-digit
backlit LCD
Low
Battery
Indicator
Battery
Charge
Indicator
Level
Bubble Control Buttons
Figure 1-1. Valor 1000 Control Panel.
Center of Zero,
NET, Stability, &
Sum icons
TABLE 1-3. FUNCTIONS OF DISPLAY CONTROLS
Button Action Function
Short Press Sets display to zero
ZERO
(Enter) Menu Press Confirms settings
Short Press Tares weight of item on pan
TARE
(ª)Menu Press Decrement over and under settings (ª)
Short Press Stores displayed weight in accumulation memory.
(Displays accumulation data when display is at zero.)
Menu Press Increment over and under settings (©)
M+
Units
(©)
Long Press Change unit of measure while long-pressing SELECT button
Short Press When setting over and under values,
shift to next digit
SELECT
Units
(§)Menu Press Change unit of measure with short press of M+
1.5.2 Power ON/OFF
To turn the scale on, flip the toggle switch on the bottom-right of the Housing. The scale
performs a display test, momentarily displays software version, and then enters the active
weighing mode. 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.
Before using the scale for the first time, the battery should be fully charged for up to 12 hours.
During charging, the battery Charge indicator remains lit. The scale can be operated during
charging. The battery is protected against over-charging and the scale can remain connected to
the AC power line.
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CHAPTER 1 GETTING STARTED
1.6 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. The gauges
are bonded very securely to the metal, where they sense very small deflections in the metal
caused by the load being applied to the cell. Because the signal levels are very small, the
circuit is protected from all outside influences such as moisture, physical damage, or electrical
interference.
Figure 1-2. Strain Gauge Load Cell.
The strain gauges are wired into a Wheatstone Bridge Circuit. (See Figure 1-3.)
Figure 1-3. Downward force on the Platform bends the beam, causing two gauges to stretch
and two to compress in opposition, changing the electrical resistance of the circuit.
At zero load, all strain gauges are unstressed. Weight placed on the Platform bends the
beam, causing two gauges to stretch and two to compress in opposition, changing the
electrical resistance of the circuit.
Force
Strain Gauges
Holes drilled in Strain
Gauge Load Cell
Attachment points to
Platform
Wheatstone Bridge Circuit
Strain Gauge
Strain Gauge
–
–
Strain Gauge
+
Strain Gauge
+
Beam
Printed Circuit Board
completing Wheatstone
Bridge circuit
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CHAPTER 1 GETTING STARTED
1.6 HOW LOAD CELLS OPERATE
The difference in the output signal before and after the mass was placed on the platform is
taken, interpreted and displayed.
Figure 1-4. Route of electrical Load Cell input and output through Wheatstone Bridge circuit.
A Load Cell is a force sensor, which receives a voltage (excitation) from a regulated power
source in the Indicator, and sends back a low-voltage milli-volt (mV) relative to the force applied.
The Load Cell signal 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 and 5V excitation would have a change of
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.
Tension
Tension
Compression
Compression
+Excitation
(Supply)
–Excitation
(Supply)
INPUT(volts)
LOADCELL
2 mV/V
Strain
Gauges
4 strain gauges
connected as a
Wheatstone
Bridge
OUTPUT (milli volts)
+Sig
–Sig
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CHAPTER 1 GETTING STARTED
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CHAPTER 2 DIAGNOSTIC GUIDE
2.1 TROUBLESHOOTING
This section of the manual contains troubleshooting information. Information is contained to
isolate specific problems using Table 2-1, Diagnostic Guide. Follow all directions step by step.
Make certain that the work area is clean. Handle scale components with care. Use appropriate
Electro-Static Device.
2.2 DIAGNOSTIC GUIDE
Table 2-1 is a Diagnostic Guide designed to help locate the problem area quickly and easily.
The probable causes are listed with the most common cause first. If the first remedy does not
fix the 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 identify the symptom
2. Refer to Table 2-1, Diagnostic Guide and locate the symptom.
3. Follow the suggested remedies in the order they appear.
4. Perform the indicated checks, or see the appropriate section of the manual.
5. Repair or replace the defective section of the balance.
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. Visual Check:
– Clean the unit before evaluating any mechanical problems. In some cases,
debris may have accumulated inside the Housing. Make sure there is no buildup
of any foreign material.
– Examine the unit for bent Frame or signs of physical abuse that could cause it to
malfunction. Replace all damaged parts. See Chapter 5 for parts identification.
– Check that the Down Stops are not touching the Frame. This would restrict
movement, causing improper operation. If the Down Stops are improperly set,
adjust them. (See Section 3.6.)
– Check the cables leading to the Load Cell for cuts, abrasions or other signs of
excessive wear and tear.
– Check for a bent or twisted Load Cell: Place the top surface and then each of
the sides of the Load Cell on a flat surface, to see if it rests flat and even.
A gap indicates a bent or twisted Load Cell. A Load Cell that is even slightly bent
or corroded should be replaced.
– Examine the Load Cell for corrosion due to high humidity or exposure to
chemicals.
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CHAPTER 2 DIAGNOSTIC GUIDE
2.2.2 Checking Load Cells for Trouble
2. Perform a Resistance Test, to determine if the Load Cell is severely damaged or a
short circuit to the frame has occurred. (See Chapter 4 for details.)
Note: The Load Cell must be completely disconnected from the Printed Circuit
Board and at no load when the resistance readings are taken.
Using an ohm meter, measure and record resistance between each pair of wires
from the Load Cell, as specified in Table 2-1. Compare the measured readings with
the specified values in Table 2-1.
If the resistance readings are in the range specified, skip to the next section. If they
are outside the expected range, open circuit or short-circuit across any two wires, the
Load Cell is defective: replace it. (See Chapter 3.)
TABLE 2-1. LOAD CELL RESISTANCE READINGS (in Ohms)
Models Ex+ to Ex–S+ to S– Ex+ to S–Ex+ to S+ Ex– to S+ Ex–to S–
V11P3 404 ± 10 350 ± 4 289 ± 10 289 ± 10 289 ± 10 289 ± 10
V11P6 404 ± 10 350 ± 4 289 ± 10 289 ± 10 289 ± 10 289 ± 10
V11P15 404 ± 10 350 ± 4 289 ± 10 289 ± 10 289 ± 10 289 ± 10
V11P30 404 ± 10 350 ± 4 289 ± 10 289 ± 10 289 ± 10 289 ± 10
3. Perform an Output Voltage Test:Measure the no load, 50% load and full load
output. The reading should meet the Load Cell specifications. The Load Cell output
should be very close to linear over its capacity range.
NOTE: The following steps involve power applied to the scale. Load Cell solder
contacts can be used as measuring points. See Figure 2-1.
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*
GREEN WHITE RED BLACK
EXE– EXE+ SIG+ SIG–
*Color codes may vary.
– Insert the Platform Support into the Load Cell Frame, place the Platform on top,
and turn on power to the scale.
– Using a voltmeter, measure and record the excitation voltage supplied to the
PCB: with no load on the Platform, measure the voltage across points 3 and 4 of
Load Cell connection on the PCB (+EXE and –EXE). This voltage must be
approximately 5.0 Volts dc with the Load cell connected. If the voltage is lower,
disconnect the Load Cell cable from the PCB and measure again. If the voltage
is 5 Volts dc, the Load Cell is defective and must be replaced. If the voltage
remains low, the PCB is defective and must be replaced.
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CHAPTER 2 DIAGNOSTIC GUIDE
2.2.2 Checking Load Cells for Trouble
Figure 2-1. Load Cell wire connections to Main PCB.
CAUTION:
IN THE NEXT STEP, DO NOT OVERLOAD THE SCALE BEYOND FULL
CAPACITY RATING.
– Measure the voltages on +SIG and –SIG wires, disconnected from PCB
(points 1 and 2 in Figure 4-2). Note: Measurements must be made with these
wires disconnected from the PCB. These measurements represent the output of
the Load Cell. Record measurements at Zero Load, 50% and full scale
capacities. See Table 2-3 for typical readings.
NOTE: Table 2-1 indicates typical readings. Actual values can vary, but should
remain linear throughout the range. If readings are out of tolerance, replace the
Load cell. (See Section 3.6.)
TABLE 2-3. LOAD CELL OUTPUT READINGS (in mV with 5V Excitation)
Model/Capacity Zero Load 50% Load 100% Load
V11P3 / 3kg 1.5 ± 2.0 Zero + 4.1 Zero + 6.7
V11P6 / 6kg 0.9 ± 2.0 Zero + 3.4 Zero + 5.9
V11P15 / 15kg 0.6 ± 2.0 Zero ± 3.2 Zero ± 5.9
V11P30 / 30kg 0.3 ± 2.0 Zero + 2.8 Zero + 5.4
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CHAPTER 2 DIAGNOSTIC GUIDE
2.2.3 Diagnostic Guide
TABLE 2-4. DIAGNOSTIC GUIDE
Symptom Possible Cause Remedy
Scale will not turn
on. No power to scale
Battery power exhausted
Adapter defective
Input connector at rear of
balance may be defective
On/Off switch defective or
actuating fingers on top housing
defective.
Main PC Board defective.
Verify connections and voltage.
Connect power and charge battery.
Check the AC adapter voltage
output which should match the
specified voltage on the adapter.
If voltage is low or nonexistent,
replace the AC adapter. If OK,
Proceed.
Open the balance. Leave the cable
connected to the top housing.
Reconnect the AC adapter to the
balance. Check AC voltage at the
input connector terminals. It should
read 12 V AC.
If voltage is not present, replace the
input connector. If OK, proceed.
(Caution: disconnect the AC
adapter and remove power and/or
batteries from the balance for this
procedure, to prevent damage to the
ohmmeter.)
Open the balance. Using an ohm-
meter, measure the resistance
between the pins on the On/ Off
switch. It should be open. If
continuity is not present, replace the
switch.
Replace the Main PC Board.
Poor accuracy Unstable environment
Balance out of calibration
Balance was not re-zeroed
before weighing.
Move scale to suitable location;
insure that balance is level.
Calibrate the balance.
Press Zero with no weight on the
pan, then weigh item.
Unable to calibrate Unstable environment
Incorrect calibration mass
Up and down stops out of
adjustment.
Load Cell defective.
Move scale to suitable location.
Use correct calibration mass.
Remove the cover from the load
cell. Check the Overload Stops.
(See Section 3.7.) If OK, the load
cell is defective.
Replace the Load Cell. (See
Section 3.6.)
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CHAPTER 2 DIAGNOSTIC GUIDE
2.2.3 Diagnostic Guide
Symptom Possible Cause Remedy
Scale flashes Bat Battery discharged Connect power and charge battery.
Battery fails to
charge fully Battery is defective Replace battery.
-----H Overload during power on Remove weight from pan and
re-zero.
Calibrate
-----L Underload during power on Install pan and re-zero.
-Over- Weight on pan exceeds
capacity Remove weight from pan.
Err-1 Invalid under and over limit
settings Re-enter under and over limits. Calibrate the scale.
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CHAPTER 2 DIAGNOSTIC GUIDE
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CHAPTER 3 MAINTENANCE PROCEDURES
3.1 PREVENTIVE MAINTENANCE
Ohaus scales are precision instruments and should be carefully handled, stored in a clean, dry,
dust-free area, and cleaned periodically. Follow these precautionary steps:
– When a scale has had chemicals or liquids spilled on it, all exterior surfaces should be
cleaned as soon as possible with warm water on a damp cloth.
– Do not leave a mass on the scale when the scale is not in use.
– Allow time for the scale to stabilize after moving it from an area which is at a different
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 another 20 minutes after turning the scale on, for the scale electronics 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.
2. Clean the outside of the scale using a damp cloth with warm water.
CAUTION
DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.
SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE’S FINISH.
3. Check the Power Cord for broken or damaged insulation.
4. If using the rechargeable battery and the scale malfunctions, first recharge the
battery to see if this resolves the problem.
5. Make a visual inspection for faulty connectors, wiring, and loose hardware.
3.2 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.
3.3 OPENING THE SCALE
Use these procedures in order to replace the Load Cell, any of the Printed Circuit Boards and/or
LCD Displays.
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CHAPTER 3 MAINTENANCE PROCEDURES
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.
2. Remove the Pan Support.
3. Turn the scale over. Remove the four screws holding the Housing in place.
(See Figure 3-1.)
4. If the Load Cell is to be removed,
also remove the screws over the
cover to the Load Cell bolts. (The
bolts can be removed later.)
5. Separate the Top Housing from the
Bottom Housing. Avoid straining
the cables that connect the Main
PCB to the parts in the Bottom
Housing. (Lay these two housings
close to each other, so this cable is
not strained.)
Figure 3-1. Valor 1000 Bottom. Rechargeable
Battery
Screws that secure the Housing
Screws over
cover to Load
Cell bolts
Load
Cell
Frame
Switches PCB
Load Cell Cable
leads soldered to
the Main PCB
Main
PCB
Figure 3-2. Top and Bottom Housings
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