Excell PW Service Manual
EXCELL PRECISION CO., LTD
PW Service Manual SME300000016
© Excell Precision Limited 2004. All rights reserved Worldwide.
The information contained herein is the property of Excell Precision Limited and is supplied
without liability for errors or omissions. No part may be reproduced or used except as
authorised by contract or other written permission. The copyright and the foregoing
restriction on reproduction and use extend to all media in which the information may be
embodied.
EXCELL PRECISION CO., LTD
PW Service Manual SME300000016
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Table of Content
INDICATOR HOUSING.........................................................................................3
BEFORE USING THE SCALE..............................................................................4
PREPARING TO USE THE SCALE......................................................................4
CHAPTER 1 INTRODUCTION..............................................................................5
1-1 Features and Specifications............................................................................................5
1-2 Scale Appearance............................................................................................................6
1-3 Power Supply...................................................................................................................6
1-4 Display..............................................................................................................................7
1-5 Keyboard Function...........................................................................................................8
1-6 Error Messages................................................................................................................9
1-7 Weight Units.....................................................................................................................9
CHAPTER 2 SERVICE MODE ACCESS............................................................10
2-1 Capacity Configuration .........................................................................11
2-1-1 Weight Units Setting ...........................................................................12
2-1-2 Customised Weight Unit Setting (no resolution limit).........................14
2-1-3 Modify “Customized Weight Units” Setting................................................................19
2-2 Weight Calibration .............................................................................20
2-2-1 Weight Calibration Setting .............................................................21
2-2-2 Manufacturing Location Gravity Setting .........................................22
2-3 Linearity Adjustment ..........................................................................23
2-4. Function Setting ...............................................................................26
2-4-1 Environment parameters ..............................................................27
2-4-2 Approval configuration .................................................................28
2-4-3 Keyboard buzzer type ..................................................................29
2-5 Gravity zone compensation .............................................................30
CHAPTER 3 ADVANCED FUNCTIONS.............................................................31
3-1 Advanced Function Setting Table.................................................................................31
3-2 Advanced Function Setting Workflow..........................................................................33
3-3 General Function Setting ....................................................................34
3-3-1 Automatic Backlight Function Setting ..............................................35
3-3-2 Automatic Power-off Timer Setting ..................................................36
3-3-3 HI/LO/OK Settings ...........................................................................37
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3-3-4 Restore to the Default Settings .........................................................38
3-3-5 Noise Filter Settings ........................................................................39
3-3-6 Hold Function Settings ....................................................................40
3-3-7 Auto Unit Weight Averaging Setting ................................................41
3-4 Weight Calibration .................................................................................42
3-5 RS232 Serial Interface Settings ...........................................................43
3-5-1 Baud Rate Settings ..........................................................................44
3-5-2 Communication Protocol Settings ....................................................45
3-5-3 Output Format Settings .....................................................................46
3-5-4 Continuous Transmission Settings ...................................................47
3-5-5 Selection of the Continuous Transmission Rate ...................................48
3-5-6 Auto Transmission at Zero ..............................................................49
3-5-7 Reset Auto Transmission ..................................................................50
3-5-8 Output Condition Settings ................................................................51
APPENDIX I: ASCII CODE TABLE.....................................................................55
APPENDIX II: 7 SEGMENT DISPLAY CHARACTERS......................................56
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PW Service Manual SME300000016
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INDICATOR HOUSING
Before opening the stainless steel indicator housing, make sure it is dry. If necessary wipe
the housing dry paying particular attention to the joint between the front panel and rear housing.
The re-assembly instructions should be accurately followed to ensure the IP rating is
maintained in service. NOTE: There are no user serviceable parts inside the indicator and all
service work should be carried out by the technical staff of your supplier.
RE-ASSEMBLY INSTRUCTIONS:
Position the front panel onto the rear housing and fit all six fixing screws finger tight.
Tighten the screws in the order shown in the diagram below to a torque of 12 kgf-cm. NOTE:
Over tightening the screws could impair the IP rating.
Tightening order:
stndrdthth
th
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BEFORE USING THE SCALE
To enable you to use this scale correctly, we suggest that you read this manual carefully.
INSTRUCTIONS FOR USE
1. The load placed on the weigh pan must NOT exceed the maximum weighing capacity of
the scale.
2. Protect the scale from high temperatures.
3. Avoid objects impacting with the scale. Do not drop loads onto the scale or subject the
weigh pan to any strong shock loads.
PREPARING TO USE THE SCALE
1. Locate the scale on a firm level surface free from vibrations for accurate
weight readings.
2. Adjust the four levelling feet (if fitted) to set the scale pan level.
3. Avoid operating the scale in direct sunlight or drafts of any kind.
4. If possible avoid connecting the scale to ac power outlet sockets which are
adjacent to other appliances to minimise the possibility of interference
affecting the performance of the scale.
5. Remove any weight that might be on the weigh pan before the scale is
switched on and avoid leaving weight on the pan for long periods of time
6. All goods weighed should be placed in the centre of the weigh pan for
accurate weighing. The overall dimensions of the goods being weighed
should not exceed the dimension of the weigh pan.
7. Once the scale has been powered on, it will go through an LCD display test
and it is ready for use when the display shows zero.
8. The scale requires 15~20 minutes warm up before operation to ensure best
accuracy
9. Please note when the
symbol keeps flashing on the screen, the
batteries need to be recharged.
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CHAPTER 1 INTRODUCTION
1-1 Features and Specifications
Features:
n Sealed to IP67, Waterproof and dust proof (Only use cables of
3mm~5.5mm diameter to ensure correct sealing of the cable glands)
n Up to 1/15,000 display resolution (Internal 1/300,000)
n Large LCD display with LED backlight
n Kilogram (kg) and pound (lb) weighing modes
n Auto calibration; Full range tare; Auto-zero tracking; Simple counting;
Gross/Net indication
n Hold function; Check mode Lo/Hi/OK
n Adjustable gravity value
n Low power indication
n Built-in RS-232 Serial Output
Specifications:
n Analogue Input: Input Sensitivity 0.3µ V/d (Min.)
n Input Signal Range: -1mV~+14mV
n Input Zero Range: -1mV~+5mV
n Load Cell Excitation: 5V DC
n Load Cell Drive Capacity: up to 4 x 350Ω / load cells
n Non-linearity: 0.01% of full scale
n A/D Resolution: 500,000 counts (Maximum)
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1-2 Scale Appearance
1-3 Power Supply
Power Supply Selection
1. 6V / 4.5Ah Rechargeable battery
2. Adaptor DC 9V
Power Consumption
Approximately DC 14 mA (Indicator)
Approximately DC 24 mA (Indicator + Display backlight)
Low Battery Warning
Please note when the (
) symbol keeps flashing on the display, the internal battery should
be recharged.
The package includes:
1. Indicator 1 off
2. Power supply 1 off
3. User Manual 1 off
When you first unseal the
product package if you find any
of the items above are missing,
contact your supplier.
256 mm
170 mm
90 mm
Power supply connector
Load cell cable entry
RS-232 cable entry
(RS-232 and load cell
cables
size
3mm~5.5mm diameter to ensure
correct sealing of the cable glands)
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.
. .
. . .
. . . .
Pcs
1-4 Display
1 2 3 4 5 6 7
HI : The weight on weigh pan is greater than the high limit
OK : The weight on weigh pan is equal to the OK limit
LO : The weight on weigh pan is less than the lower limit
kg : kg units. When “kg” is displayed, it means the weight shown is in kg
lb : Pound units. When “lb” is displayed, it means the weight shown is lb
Pcs : Piece units. When “Pcs” is displayed, it means the scale is in “sampling
and counting” mode
à0ß : Zero balance indication, when displayed the scale is at the centre of its
zero band
Net : The display shows the weight of the goods, not including the weight of
any container. This Net status indication is on when the TARE function is
used
: Battery status indication. When this symbol is flashing recharge the
internal battery.
1
STABLE
: The weight is stable when lit.
2
GROSS
: The scale is in the gross mode. The display shows the goods and any
container weight. This Gross status indication is on when the TARE
function is used.
3 : The unit weight is too small. When the icon is on, the counting function is
operational but may result in lower count accuracy.
4
: The sample size is too small. When the icon is on, the counting function
is operational but may result in lower count accuracy.
5
Hold
: The Hold function is in use when lit.
6
: “GN”, “dwt”, or “carat” units. The actual unit depends on the model of the
scale.
7
oz
: ounce unit. When “oz” is on, it means the scale is weighing in ounces
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1-5 Keyboard Function
ON/ZERO
KEY
Press the
ON/ZERO
key to switch the indicator on. When switched on the
ON/ZERO
key acts
as the zero balance function.
OFF
KEY
When the indicator on, press the OFF key to switch it off.
TARE
KEY
The tare function will not operate during the following conditions:
(1) When the scale powers on if the weight is negative and after a container is placed on
the weigh pan if the weight is still below zero.
(2) The tare value is over the full scale capacity.
UNITS
KEY
Press the UNITS key to switch weight units; the display icons will indicate the active units.
NET/GROSS
KEY
In the Tare mode, the screen displays the “
TARE
” icon; press the NET/GROSS key to switch
between the “Net value” and the “Gross value”.
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1-6 Error Messages
⇒ The EEPROM is not working correctly.
⇒ Zero is higher than the zero range when switching the indicator on.
⇒ Zero is lower than the zero range when switching the indicator on.
⇒ A/D value is unstable.
⇒ A/D value is below Zero.
⇒ A/D IC malfunction (cannot read A/D value). The load cell may not be
connected to the indicator correctly.
⇒ The weight of the object is over the maximum capacity + 9 divisions.
⇒ A/D value is over the maximum range.
1-7 Weight Units
(kg) 1 g = 0.001 kg
(g) 1 g = 1 g
(lb) 1 g = 0.002204623 lb
(lb/oz) 1 g = 0.03527396 oz
(oz) 1 g = 0.03527396 oz
(GN) 1 g = 15.432358 GN
(dwt) 1 g = 0.6430149 dwt
(ct) 1 g = 5 ct
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PW Service Manual SME300000016
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Press
UNITS
key
CHAPTER 2 SERVICE MODE ACCESS
n Set the jumper SWA1 on the main board to the ADJ position (EEPROM UNLOCKED).
Switch the PW on. The display shows .
n When finished, set the jumper SWA1 back to the LOCK position.
n If the jumper SWA1 is returned to the LOCK position during calibration, the PW exits the
service mode automatically.
⇒ Capacity Configuration ⇒ Function Setting
⇒ Weighing Calibration ⇒ Gravity Setting
⇒ Linearity Calibration
Press
ON/ZERO
key
Press
UNITS
key
Press
ON/ZERO
key
Press
ON/ZERO
key
Press
ON/ZERO
key
Press
ON/ZERO
key
Press
UNITS
key
Press
UNITS
key
Press
UNITS
key
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Input a parameter “00” or
“01”
Af
ter inputting “00”, press
TARE
key to return to the
previous step. (Exiting from
capacity configuration)
2-1 Capacity Configuration
4 Capacity configuration includes
Weight Units Setting
Customised Weight Units Setting
ON/ZERO
key ⇒ Increment number by 1
UNITS
key ⇒ Decrement number by 1
TARE
key ⇒ Move cursor one place to the right
NET/GROSS
key ⇒ Move cursor one place to the left
⇒ Return to the Upper Level
⇒ Weight Units Setting
⇒ Customised Weight Units Setting
Press
TARE
key
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Press
TARE
key
Refer to “Note 3”
Press
TARE
key
Press
TARE
key
Refer to “Note 1”
Press
TARE
key to
complete the setting.
Input the parameter “00
kg
Refer to “Note 2”
2-1-1 Weight Units Setting
There is no resolution limitation, when the weight units “kg, g, lb, lb/oz” are selected.
The weight units ”oz, GN, dwt, and ct” are only available on indicators with less 1/10,000
external resolution.
.
.
ON/ZERO
key ⇒ Increment number by 1
UNITS
key ⇒ Decrement number by 1
TARE
key ⇒ Move cursor one place to the right
NET/GROSS
key ⇒ Move cursor one place to the left
The display shows the maximum
capacity of the scale + minimum
division and the unit weight for 2
seconds.
The display shows the maximum
capacity of the scale + minor
division size and the weight units
for 2 seconds.
Example:
Two weight units “kg” & “lb”, with
“kg” as the units used for weight
calibration.
Example:
015000 ⇒ 15.000 kg
For example:
1 ⇒ minimum division
3 ⇒ decimal point position
2 ⇒ range setting
Press
TARE
key
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NOTE 1 The users can set up the different weight units in various orders according to their
preference, and the amount of the chosen weight units can be up to 5
(a) (b) (c) (d) (e) (f)
(a) ⇒ The first weight unit (only “kg”, “g”, or “lb” are available to choose from. Please select one of the
parameters 0, 1, or 2)
(b) ⇒ The second weight unit (select one of the parameters 0 ~ 5)
(c) ⇒ The third weight unit (select one of the parameters described below)
(d) ⇒ The fourth weight unit (select one of the parameters described below)
(e) ⇒ The fifth weight unit (select one of the parameters described below)
(f) ⇒ The amount of the weight units selected (select one of parameters 0 ~ 5)
The description of the parameters
0 ⇒ kg 5 ⇒ oz
1 ⇒ g 6 ⇒ GN
2 ⇒ lb 7 ⇒ dwt
4 ⇒ lb, oz 8 ⇒ ct
For example:
Choose “kg” & “lb” (two weight units). NOTE the scale is calibrated using “kg” weights
NOTE 2 Enter the maximum capacity of the scale, total 6 digits
(g) (h) (i) (j) (k) (l)
For example:
15.000 kg ⇒ key in 015000
1500.0 g ⇒ key in 015000
6.000 lb ⇒ key in 006000
NOTE 3 Set the minimum division and decimal point position to determine the display
resolution
(m) (n) (o)
(m) ⇒ Division size (select 1, 2, or 5)
(n) ⇒ The number of decimal places (0 ~ 5)
For example: 15.000 kg ⇒ enter 3
1500.0 g ⇒ enter 1
6.000 lb ⇒ enter 3
(o) ⇒ range setting (select one of parameters 0, 1, 2, or 3)
For example: 0 ⇒ full range, 1 ⇒ full range, 2 ⇒ dual range (divided at 1/2 of the full scale), 3
⇒ triple range (divided at 1/6 of the full scale & 2/3 of the full scale)
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Press
TARE
key
Refer to “Note 4”
Refer to “Note 6”
Press
TARE
key
Refer to “Note 5”
kg
Press
TARE
key
Press
TARE
key
Refer to “Note 5”
lb
2-1-2 Customised Weight Unit Setting (no resolution limit)
.
.
ON/ZERO
key ⇒ Increment number by 1
UNITS
key ⇒ Decrement number by 1
TARE
key ⇒ Move cursor one place to the right
NET/GROSS
key ⇒ Move cursor one place to the left
The display shows the number of weighing
units and the units
for the weight calibration
set previously
The display shows the maximum
capacity of the scale + minimum
division set previously for 2 seconds,
then reverts back to the upper level
For example:
5 ⇒ 5 weight units
2 ⇒ “lb” is the weight unit for calibration
Show the code of weight unit for weight
calibration for 2 seconds
⇒ “ lb ”
⇒ “ g ”
⇒ “ kg ”
For example:
012000 ⇒ 12.000 lb
For example:
5 ⇒ minimum division
3 ⇒ decimal point position
2 ⇒ “ lb ”
0 ⇒ full range
1 ⇒ save the setting at the first position
Key in the mass value
012000 ⇒ 12.000 lb
Cont
Press
TARE
key
The display shows the maximum
capacity of the scale + minimum
division set previously for 2
seconds.
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Press
TARE
key
Refer to “Note 5”
Refer to “Note 6”
Press
TARE
key
Press
TARE
key
Set all weight units
according to preference
Press
TARE
key
to complete the setting
lb
Refer to “Note 5”
Press
TARE
key
g
After all weight units desired
have been set
.
ON/ZERO
key ⇒ Increment number by 1
UNITS
key ⇒ Decrement number by 1
TARE
key ⇒ Move cursor one place to the right
NET/GROSS
key ⇒ Move cursor one place to the left
Cont
Input “00”
The display shows the maximum
capacity of the scale + minimum
division set previously for 2
seconds.
For example:
006000 ⇒ 6000 g
For example:
1 ⇒ minimum division
0 ⇒ decimal point position
1 ⇒ “ g ”
0 ⇒ full range
2 ⇒ save the setting at the second position
The display shows the maximum
capacity of the scale + minimum
division set previously for 2
seconds.
Enter the mass value
12 lb = 5443 g
005443 ⇒ 5443 g
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NOTE 4
(a) (b)
(a) ⇒ The number of the weight units (Max: 5, key in 1 ~ 5)
(b) ⇒ The weight unit for weight calibration (choose from “kg”, “g ”, “lb”, key in 0, 1, or 2)
Parameter description:
0 ⇒ kg , 1 ⇒ g , 2 ⇒ lb
NOTE 5
(c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n)
c ~ h set the maximum capacity (6 digits)
i ~ n set the mass value for weight calibration (6 digits)
The maximum capacity needs to be presented based on the decimal system.
For example: How to calculate the maximum capacity and the mass value based on the
different types of weight unit.
A. Choose “lb” as the weight unit for weight calibration
• The first weight unit setting: 12.000 lb / 0.005 lb (the maximum Capacity / division)
⇒ Enter the maximum capacity 012000 at (c) ~ (h)
⇒ Enter the mass value 012000 at (i) ~ (n)
‚ The second weight unit setting “g” :
0.002204623 lb = 1 g
12 lb = 5443 g. Take 6000 g as the maximum capacity
6000 g / 2 g (the maximum Capacity / division),
⇒ Enter the maximum capacity 006000 at (c) ~ (h)
⇒ Enter the mass value 005443 at (i) ~ (n)
ƒ”lb/oz” (hexadecimal notation system):
12._0.00 lb / 0.05 oz (the maximum Capacity / division)
12 lb = 12×16 (oz) = 192.00 oz
⇒ Enter the maximum capacity 019200 at (c) ~ (h)
⇒ Enter the mass value 019200 at (i) ~ (n)
„”oz” :
12 lb = 192.00 oz ,
Take 200.00 oz as the maximum capacity
200.00 oz / 0.05 oz (the maximum Capacity / division)
⇒ Enter the maximum capacity 020000 at (c) ~ (h)
⇒ Enter the mass value 019200 at (i) ~ (n)
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