UWE ADW-1500E Bedienungsanleitung

MAINTENANCE MANUAL

ADW-E SERIES

CONTENTS

1. INTRODUCTION

2. SPECIFICATIONS

2.1 SYSTEM BLOCK DIAGRAM

2.2 PHYSICAL LAYOUT OF ELECTRICAL CONNECTION

2.3 GENERAL SPECIFICATIONS

2.4 INTERNAL SETTINGS AND CALIBRATION METHODS

3. TROUBLE SHOOTING

3.1 TROUBLE SHOOTING LOOP

3.2 PARTS AND COMPONENTS TROUBLE SHOOTING

4. ELECTRICAL CIRCUITRY

4.1 SCHEMATICS

4.2 PCB LAYOUT

5. BILL OF MATERIAL

6. APPENDIX

OCT 2002 REV 1

Specifications and Function Subject to Change without Notice

1. INTRODUCTION

The ADW-E series is designed and programmed according to the OIML R-76

Class III requirements.

This scale is sealed to prevent unauthorized access to internal parts.

Ender users should be advised not to undertake any trouble shooting

except those listed on the operation manual.

This maintenance manual containsof certain information that may result

in fraudulent use. Do not release any part of this manual to any end

users or un-authorized persons.

The internal mini jumper should be so set to prevent un-authorized

settings or alternations.

Should a load cell has been replaced, make sure that the protection

devices are properly set.

After servicing, it is necessary to go through all tests and procedures

to ensure the scale meets all the meteorological and approval

requirements.

Here are some features of the ADW-E series

1. Designed to meet OIML-R76 class III requirements.

2. Zero Indicator.

3. Net Indicator.

4. Negative Value Indicator.

5. Auto Tare Function.

6. Power on Zero Function.

7. Manual Zero Function.

8. Extended Display Function.

9. Auto Power Saving Function.

10. Metric/Avoirdupois Conversion Function.

11. Low battery warning signal.

12. Single points Calibration.

13. Mini jumper to prevent end-user calibration.

14. Optional EL backlights.

15. Optional RS232C interface.

16. Optional Rear Display

17. Built-in rechargeable battery operated.

18. Battery operating time: 200 hours plus after charged.

2. SPECIFICATION

2.1 SYSTEM BLOCK DIAGRAM

Description:

When a mass is placed on the platform, the load of the article is applied

to the load cell inside it.

The resistance to the excitation current in the strain gauge will then

changed and the analog output signal varies.

It is amplified and digitized continuously by the A/D converter into

a digital signal. Subsequently, the resulting count is processed and

managed by the CPU. The CPU refers tothe instructions from the keyboard,

and then conveys the output data to LED driver, which formats the data

into readout on the display panels.

LED DISPLAY

DISPLAY

DRIVER

CIRCUIT

REAR

LED DISPLAY

CPU with ROM INTERFACE

A/D UNIT

E+

E-

S+

S-

POWER SUPPLY:

1. AC ADAPTOR

(9V 500mA)

2. RECHARGEABLE

BATTERY(6V 4Ah)

KEYBOARD

(4 KEYS)

2.2 PHYSICAL LAYOUT OF ELECTRICAL CONNECTION

DW(LED)

OPTIONAL REAR PISPLAY BOARD

LOAD CELL

RECHARGEABLE

BATTERY

6V 4Ah

DC JACK

MAIN BOARD

AC IN

TO BATT.

S+ E

E+

RS-232 BOARD

2.3 GENERAL SPECIFICATION

2.3.1 Overall View

2.3.2 Dimension:

Platter size：250 x 215mm

Overall size：270(W) X 278(D) X 145(H) mm

2.3.3 Model Specifications

Model Number Capacity (Max) Division (e)

ADW-1500E1500g 0.5g

ADW-3000E3000g 1g

ADW-6000E6000g 2g

ADW-15KE15kg 0.005kg

ADW-30KE30kg 0.01kg

Approval Class III

Maximum Tare Range 1/3 Max -1e

Power on Zero Range ±10% Max

Manual Zero Range ±2% Max

Min. Load 20e

Operation

Environment 0o~40oC (32o~104oF),

Non-condensed. R.H.≦85%

Power Consumption 0.5W (when charged)

2.3.4 Main Components Used

Microprocessors: SM8958

Crystal Oscillator: 11.0592MHz

Display Device: WTN Liquid Crystal Display

Load Cell Capacity: ADW-E-1500= 3kg

ADW-E-3000= 6kg

ADW-E-6000= 10kg

ADW-E-15K = 20kg

ADW-E-30K = 35kg

2.3.5 Analog Specification

-The maximum number of verification scale intervals will be:

n3000 for class III instruments

-Power supply of 5 V DC;

-16 bits serial digital output;

-Excitation power supply for the load cell is 5 V DC;

-Input impedance of the load cell is 350 ;

-The analog data processing unit is built in a closed metal box.

Deleted:

Model Number

Deleted:

Maximum Tare Range

Deleted: Power on Zero Range

Deleted:

Manual Zero Range

... [1]

... [3]

... [2]

... [4]

2.4 CALIBRATION METHODS

AUTO CALIBRATION

a. Turn scale off

b. Press and hold MODE, then press ON/ZERO

c. Scale display CAL?

d. Press MODE for YES and scale will self calibrate zero point

e. After zero point is calibrated, Scale will displays “LOAD

XXXX or YYYY”. For “XXXX” is about 1/3 of the full capacity

and “YYYY” is 2/3 of the full capacity

f. Load the weight according to scale

g. Wait until the scale display “donE” and start counting down

h. Calibration is completed and scale will display the weight

CHECK LOAD CELL,

A/D UNIT,OFFSET

VALUE

CHECK POWER

SUPPLY,A/D UNIT,

BAD SOLDERING,

TEMP. EFFECT

CHECK PLATTER

STOPPER,LOAD

CELL,A/D UNIT,

BAD SOLDERING

RE-CALIBRATE

THE SCALE CHECK PLATTER

STOPPER,LOAD

CELL,OFFSET

VALUE

3. TROUBLE SHOOTING

3.1 TROUBLE SHOOTING LOOP

POWER ON

COUNT DOWN

NO DISPLAY

DISPLAY RANDOM

FIGURE

CHECK POWER SUPPLY,

CPU,TACT SW. CHECK CPU,

7-SEGMENT-LEDS,

COUNTS AND

THEN ZERO?

PROPER READOUT

CORRECT READOUT

NORMAL OPERATION

SHOW

“

00000

”

UNSTABLE

ZERO DRIFT

INCORRECT

CAN’T REACH THE

FULL CAPACITY

3.2 PARTS AND COMPONENTS TROUBLE SHOOTING

3.2.1 Power Supply Checking

3.2.1.1 Relevant parts:

Main Board (DW-12-X)

Q5 (C1061)

Q3 (C945)

R41(1.2R 1/2W)

ZD1(ZENER 8.2V)

DC JACK

BATTERY(6V 4Ah)

Q1 (A1515)

Q2 (C945)

Q6 (A733)

U6 (NS2950-5)

Description:

1) Power source: Rechargeable Battery 6V/4Ah or AC adaptor(9V,

500mA)

2) How Battery is charged completely?

The charging voltage is regulated by Q5 (C1061) and ZD1 (8.2V) for

about 7 volts.

Thechargingcurrentwillgodownautomaticallywhenvoltagereached.

Q3 (C945) and R41 (1.2R, 1/2W) provide Over-Current protection.

3) +5V power drives digital circuit system.

U6 (NS2950-5) is a 5volts Voltage Regulator.

4) +5V power drives analog circuit system.

U4 (NS2950A) is a 5volts Voltage Regulator.

4) Auto-off:

If the scale is set with 4_oFF or even under LO-BAT situation,

after fixed time interval, CPU will release a low potential signal

to draw down Q2, then Q1 cuts off, the scale will be shut down

immediately.

5) Low Power Detection:

The Q6(A733) is designed to detect the power level. When battery

poweris lessthan5.5V,thecollectorpolewillbecomehighpotential,

then CPU will instruct LCD display to show LO-BAT symbol.

3.2.1.2 Input voltage: 5.5V or higher

Check and recharge battery if voltage is less than 5.5V.

3.2.1.3 System voltage (Vcc): 5V +/- 10%

Check that the system voltage is within 5V +/- 10%

a) less than 4.5V, the CPU may not work properly.

b) more than 6V, ghost will appear on LCD.

3.2.2 Platform Stopper Checking

The platform device shall not touch anything around itself during

operation. Check that the platform is not contacted with the upper

(no load) and/or lower (with load) stopper.

3.2.3 LED Display Checking

3.2.3.1 Check that every LED module is soldered properly onto the main

board.

3.2.3.2 Check whether segment of LED module is ruined.

3.2.4 CPU Checking

3.2.4.1 Check that all pins are seated properly into the socket.

3.2.4.2 Check that the Crystal Oscillator works.

3.2.4.3 Check the RESET is normally low.

3.2.5 A/D Unit Checking

3.2.5.1 Check that the +5V powers are correctly fed to the

A/D unit.

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