Operating Manual
Professional Weighing Equipment
Wheelchair Scale
LWC 800
Declaration of Conformity
Metric version:
Imperial version:
400 kg
800 lbs
Mark applied
EU Directive
Standards
2004/108/EC
EN 61326-1: 2006
Declaration of conformity for apparatus with CE mark:
We hereby declare that the product to which this declaration refers
conforms to the following standards.
Electronic scale: LWC series
Signature:
Boon Lim, R & D Manager
May 20, 2013
2
Customer Service
USA
LW Measurements LLC, 3510 Industrial Drive,
Unit H Santa Rosa, CA 95403
USA
Tel: (707) 542-2185
FAX: (707) 542-3285
EUROPE
LW Measurements Europe Ltd
Chalkwell Park House 700 London Road
Westcliff-on-Sea Essex SS0 9HQ
United Kingdom
Tel: 01702-476700
Fax: 01702-477380
ASIA
LW Measurements PTY Ltd
Block 1004, Toa Payoh North
#03-16 Singapore 318995
Tel: (65) 6458 3438
HP: (65) 8119 3401
http://www.lwmeasurements.com
Refer to our website for information about local customer service
centers and details of their addresses.
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Introduction
What you should know about these Operating Instructions:
Tree® Professional Weighing Equipment products are simple to
operate.
Nevertheless, you should read through these operating
instructions in their entirety, so that you can make optimum use of
the full potential and the diverse possibilities of the weighing
machine in your daily work.
These operating instructions contain guidance in the form of
pictograms and keyboard diagrams, which should help you in
finding the required information:
For the labeling of potential hazards and advice, please see
Section 1: Safety below.
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Contents
Section
Heading
1
Safety
1.1 Representation and symbols
1.2 Safety recommendations
2
Your weighing machine
2.1 Construction and functions
2.1.1 Construction of the weighing machine
2.1.2 Functions of the weighing machine
2.2 Application, conformity
2.2.1 Correct use of the weighing machine
2.2.2 Conformity
2.3 Data and parameters
2.3.1 Technical data
2.3.2 RS232 Data Interface
3
Getting started with your weighing machine
3.1 Unpacking the equipment
3.2 Scope of delivery
3.3 Assembling your weighing machine
3.4 Choice of a suitable location
3.5 Checking the mains voltage
3.6 When to calibrate the weighing machine
5
4
Working with the application menu using the
intelligent keypad
4.1 Display messages and key functions
4.1.1 Display messages
4.1.2 Key functions
4.2 Program options
4.2.1 Interface setting
4.2.2 Function settings
4.2.2.1 Setting auto shut-off
4.2.2.2 Setting backlight
4.2.2.3 Setting power on mode
4.2.3 Working mode setting
4.2.4 Hold function
4.2.5 Reading the display
5
Calibration using an external calibration weight
6
Maintenance and service
7
Transport and storage
7.1 Transportation and shipping
7.2 Storage
6
1 Safety
1.1 Representations and symbols
Important instructions, which involve safety, are highlighted with the
appropriate mark:
1.2 Safety recommendations
When using the weighing equipment in surroundings with increased safety
requirements, the corresponding regulations must be observed.
The weighing machine may only be used with the power adapter supplied
exclusively for use with the weighing machine.
Before inserting the power adapter, the user must ensure that the operating
voltage stated on the power adapter agrees with the mains voltage.
If not, please contact Customer Service at the address above.
If the power adapter or its cable is damaged, the weighing machine must
immediately be disconnected from the electricity supply (pull out the power
adapter).
The weighing machine may only be operated from mains electricity supply with
a power adapter which is in perfect condition.
If there should be any reason to believe that it is no longer possible to operate
the weighing machine without danger, the weighing machine is to be
immediately unplugged from the electricity supply (pull out power adapter) and
secured against inadvertent operation.
In carrying out maintenance work, it is essential to follow the recommendations
in Chapter 6: Maintenance and service.
The weighing machine must not be operated in an area subject to explosion
risks.
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Figure 2.1 Your weighing machine
Care must be taken when weighing liquids to ensure that no liquid is spilled
into the inside of the weighing machine or into connections on the rear of the
equipment or the power adapter. If liquid is spilled on the weighing machine, it
must immediately be unplugged from the mains electricity supply (pull out
power Adapter).
The weighing machine may only be operated again after it has first been rechecked by a service technician.
These operating instructions must be read by each operator of the equipment
and must be available at the workplace at all times.
2 Your weighing machine
2.1 Construction and functions
2.1.1 Construction of the weighing machine
The weighing machine consists of a (1) weighing machine, (2) indicator, (3)
wall mount bracket, (4) screws with butterfly nuts, (5) A/C adapter and this
operating manual.
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3
2
Figure 2.2 Indicator
Figure 2.3 Wall mount bracket
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Figure 2.4 4 screws with butterfly nuts
Figure 2.5 A/C adpter
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2.1.2 Functions of the weighing machine
Model number
Capacity
Graduation
Platter Size
LWC 800
400 kg
0.1kg
96.01 x 100.08 cm
Shipping weight
40.82 kg
Package
(Standard carton)
132.08 x 114.3 x 12.7 cm
Operating Temp.
5 – 35 Cº
Power source
AC/DC Adapter 9V DC / 100mA
Model number
Capacity
Graduation
Platter Size
LWC 800
800 lb
0.2 lb
37.8 x 39.4 in
Shipping weight
90 lbs
Package
(Standard carton)
52 x 45 x 5 in
Operating Temp.
40-95 ºF
Power source
AC/DC Adapter 9V DC / 100mA
The Large Wheelchair Scale is a high-quality electronic precision weighing
machine with the following specifications
Metric Specifications
Imperial Specifications
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FEATURES
Display options: 5 digital LCD
Power : AC adapter 9V / 100mA
Auto back light (selectable)
Auto shut off (selectable)
Operating temperature: 5-35 ºC
Operating humidity: 25% - 95% RH
Zero Range (0 to 4% of full capacity)
Tare Range (4% to full capacity
Two calibration weight units: kg, lb
Open calibration capacity
Power on zero-setting range: +10%
Two modes: Normal mode / Setting mode
RS232 function
2.2 Application, conformity
2.2.1 Correct use of the weighing machine
The maximum allowable load of the weighing machine must never be
exceeded; otherwise the weighing machine may be damaged.
In using the weighing machine in combination with other appliances as well as
with appliances produced by other manufacturers, the appropriate regulations
for the safe use of the relevant attachments and their application in
accordance with instructions must be observed.
2.2.2 Conformity
The weighing machine has been manufactured and tested in accordance with
the standards and recommendations set out in the declaration of conformity.
The power adapter produced for the operation of the weighing machine and
intended exclusively for this application complies with the appropriate electrical
protection class.
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2.3 Data and parameters
2.3.1 Technical data
The following applies to the LWC series
Power supply:
Input: 120 V or 230V AC (+/-15-20%); 60Hz
Output: 9V DC 100mA
Allowable ambient conditions:
Temperature: 5°C - 35°C, 41°F - 95°F
Relative humidity: 25% - 95%, non-condensing
2.3.2 RS232 Data interface
Connector: DB9
SCALE PC
2 2
3 3
5 5
Transmissions Settings
Mode: Simplex Asynchronous Serial Baud Rate: 9600
Data Bit: 8 Parity Bit: None
Stop Bit: 1 Data Format: ASCII
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Transmission Information Format： 20 Byte ，blank=20H
1~2 3 4~13
14~18
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20
‘W: ’ P DATA
UNIT
CR
LF
W: Start of Data Transmission=57H+3AH
P : Polarity ‘+’ = 2BH = Positive ‘-’ = 2DH =Negative
DATA: 12.345’’=20H+20H+20H+20H+31H+32H+2EH+33H+34H+35H
UNIT: ‘lb’ =6CH+62H+20H+20H+20H
‘kg’ =6BH+67H+20H+20H+20H
CR: = 0DH
LF: = 0AH
If you have any questions on the technical data or require detailed technical
information on your balance, please contact your technical representative.
3 Getting started with your weighing machine
3.1 Unpacking the equipment
The machine is delivered in an environmentally-friendly carton, specifically
developed for this precision instrument, which provides optimum protection for
the machine during transportation.
We suggest that you retain the original packaging in order to avoid
transportation damage if re-shipping or transporting the machine and to allow
the unit to be stored in the best conditions if it is out of operation for an
extended period.
In order to avoid damage, attention must be given to the following points when
unpacking the weighing machine:
Unpack the weighing machine carefully. It is a precision instrument.
When outside temperatures are very low, the machine should first be
stored for some hours in the unopened transport package in a dry
room at normal temperature, so that no condensation settles on the
unit when unpacking.
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Check the weighing machine immediately after unpacking for
Component delivered present
yes / no
Weighing Machine
Folding Handle
Indicator
(4) Screws / (4) butterfly Nuts
Power adapter
Operating manual
externally visible damage. If you should find transport damage, please
inform your service representative immediately.
If the machine is not to be used immediately after purchase but only at
a later time, it should be stored in a dry place where fluctuations in
temperature are as small as possible (see Chapter 7 .Transport,
storage.).
Read through these operating instructions; even if you already have
prior experience with weighing equipment, before you work with the
unit and pay attention to the Safety recommendations (see Chapter 1
.Safety).
3.2 Scope of delivery
Inspect delivery for completeness immediately on unpacking all components.
Checklist for complete delivery
3.3 Assembling your weighing machine
The weighing machine is delivered in partly dismantled condition. Assemble
the individual components in the following sequence:
Place your machine on a level, stable, clean, dry surface to obtain
accurate readings.
Loosen the screw on the handle.
Pull the column upward to a 90 degree angle.
Insert the column into the slot and screw into place.
Fix the indicator bracket to the column with screw and nut.
Connect the power cord to the indicator.
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NOTE: the AC input requirement could be 110, 120, 220, 230 or 240 Volts
(50/60 Hz) depending on the area where used, so please verify that the
adapter is correct
3.4 Choice of a suitable location
The environment in which your weighing machine is used is very important. Air
movement, temperature changes, water and humidity, vibrations, direct
sunlight, etc. all influence the performance of high precision weighing
machines. Therefore, place your weighing machine on a dry, solid, sturdy
surface that is free of air currents, vibration, and exposure to water and not in
direct sunlight. The surface should not be magnetic and should be located
away from doors, windows, heaters, air conditioners, water and fans.
To summarize:
Put the weighing machine on a solid, firm and preferably vibration-
proof, horizontal base
Make sure that the weighing machine cannot be shaken or
knocked over
Protect from direct solar radiation and exposure to water
Avoid drafts and excessive temperature fluctuations
3.5 Checking the mains voltage
The following Safety recommendations must be observed when connecting
the balance to the mains:
The machine may only be operated with the power adapter supplied.
Check before connecting the power adapter to the mains supply, that the
operating voltage stated on the power adapter agrees with the local mains
voltage.
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If the operating voltage is not the same as the mains voltage, the power
Low battery indicator
Negative value indicator
Zero indicator
adapter must, on no account, be connected to the mains supply. Contact your
sales representative.
3.6 When to calibrate the weighing machine
Calibration is done in the factory. Don’t re-calibrate the machine unless it is
not accurate. If you do need to calibrate the machine, refer to Section 5 –
Calibration.
4 Working with the application menus using the
Key-Pad
4.1 Display messages and key functions
4.1.1 Display messages:
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4.1.2 Key Functions:
1. The ON/OFF key is to turn the Scale On or Off
2. The HOLD key is to store the weight value.
3. The UNIT key is to toggle different weighing units.
4. The ZERO key: Zero feature if load weight below 4% of full capacity;
TARE feature if load weight between 4% to 100% of capacity.
5. The PRINT key is to send data to external device through RS232
connector.
4.2 Program options
Please see our web-site at http://www.lwmeasurements.com for practical
demonstrations of applicable usage if you purchased your scale within
the continental U.S.
4.2.1 Interface Settings
Press and hold the HOLD key, and then press ON/OFF key to turn on
the scale, display will show A-ON or A-OFF
Press UNIT key, display will show “L-ON” or “L-OFF” or “L-Au”
Press UNIT key again, display will show “P-XX”
Press ZERO key to select CON,OFF, KEY, STB
a) OFF stands for serial data output disabled
b) KEY stands for manual mode by pressing [PRINT]
c) STB stands for automatic print when scale is stable
d) CON stands for continuous print
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Press ON/OFF key to turn off the Scale.
4.2.2.Function Settings
4.2.2.1 Setting Auto Shut off
Press and hold the HOLD key, then press ON/OFF key to turn on the Scale,
display will show “A ON” or “A OFF”, Press ZERO key to select Auto shut off
mode “ON” or “OFF”.
4.2.2.2 Setting Backlight
Press and hold the HOLD key, then press ON/OFF key to turn on the Scale,
display will show “A ON” or “A OFF”, Press UNIT key, display will show “L ON”,
“L OFF” or “L AU”, press ZERO key to select back light On, Off or Au(auto)
4.2.2.3 Setting power-on mode
Press and hold the HOLD key, then press ON/OFF key to turn on the Scale,
display will show “A ON” or “A OFF”, Press UNIT key three times, display will
show “J ON” or “J OFF”, press ZERO key to select “J ON” (means showing
zero when scale is turned on) or “J OFF” (means showing the weight placed
when the scale is turned on).
4.2.3 Working mode settings
- Press & hold UNIT and HOLD keys, then press ON/OFF key to turn on the
scale
- The display will show Ani. Su, press UNIT key to enter, press ZERO key to
select ON (means animal weighing mode) or OFF (means normal weighing
mode), press HOLD key to confirm.
- Press HOLD key again, display will show Ani. Kd, press UNIT key to enter,
press ZERO key to select anti-shock range between 50, 100, 200 and 400,
press HOLD key to confirm.
*** This is the anti-shock range 50d, 100d, 200d or 400d. The smaller division
range is suitable for smaller people/animals, the larger division range for larger
people/animals.
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- Press HOLD key again, display will show Ani. Fd, press UNIT key to enter,
press ZERO key to select filter range between 0.5, 3, 5 and 10, press HOLD
key to confirm.
*** This is the filter range, 0.5d, 3d, 5d or 10d that the scale displays, for
example, if we use LWC 800lb x 0.2lb for weighing a 300lb person, if we set it
to be 0.5d, then the scale will show 299.8lb, 300lb, 300.2lb..., if we set it to be
3d, then the scale will show 299.4lb, 300lb, 300.6lb... 0.5d can get a much
more accurate weighing, but it won’t be as stable; 10d will not obtain such an
accurate weighing result, but it will be much more stable.
- Press HOLD key again, the display will show Ani. Ft, press UNIT key to
enter, press ZERO key to select filter time between 1, 2, 3 and 4, press HOLD
key to confirm.
*** This is the filter time, 1s, 2s, 3s or 4s that will take to display the weighing.
Weighing will be more accurate if the user chooses 4 second (longer
displaying time), but not so accurate if 1 second (faster displaying time) is
chosen.
Press ON/OFF key to turn the scale off.
4.2.4 Hold function
- Press ON/OFF key to turn on the scale, place the item on the platform.
- Wait for the readings stable, press HOLD key, the “ . “ indicator will show
- Remove the item from the platform, the readings will still remain on the
display
- Press HOLD key to quit hold function mode
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1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
W/M
:
+
_
CR LF
M
= overload m
ode
W
= norm
al w
eighing m
ode
= w
eight inform
ation
:
W
eight inform
ation
U
nit form
ation
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
W
:
+
CR LF
5
0
k
g
.
0
50kg
4.2.5 Reading the Display
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5 Calibration - Using a Calibration Weight
Again, Calibration is done in the factory. Don’t re-calibrate the machine unless
it is not accurate. Thirty (30) minutes of warming up of the machine is always
needed before calibration.
A reminder when operating our larger capacity
scales:
The scales of the LWC series are calibrated at the factory. Usually no
recalibration is necessary unless major inaccuracies are observed. If
calibration is deemed necessary, an appropriate test weight of at least
2/3 of the full capacity of the scale should be used to obtain accurate
weighing.
Calibration procedure:
Press and hold ZERO key and then press ON/OFF key to turn on the
scale, the display will show CAPu=
Press HOLD key, display will show CAP, press HOLD key again,
display shows CALu=, press UNIT key to select calibration unit KG or
LB, a triangle icon will display to indicate KG or LB, press HOLD key to
confirm, it will show CALu= again.
Press HOLD key again, the display will show CAL, press UNIT key to
set calibration weight, display will show XXXXX with a flashing digit,
press UNIT key to move the flashing digit to right, press ZERO key to
increase the value of the flashing digit, press HOLD key to confirm, it
will show CAL again. (We recommend a calibration weight at least 2/3
of the full capacity to get an accurate weighing).
Press PRINT key, display will show CAL and then the AD value, press
UNIT key when the stable indicator displayed, it will show the flashing
calibration weight,
Place the known test weight on the platform, press UNIT key after
stable indicator displayed, it will show ------, and then the AD value,
now the calibration is finished.
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Turn off the scale, remove the test weight from the platform.
Press ON/OFF key to turn the scale on to test if the weighing is
accurate, if not, repeat above steps.
6 Maintenance and service
The weighing machine must be treated carefully and cleaned regularly. It is a
precision instrument.
For maintenance-work, the balance must be separated from the power supply
(remove power adapter plug from socket). Also ensure that the balance cannot
be reconnected to the power supply during the work by a third party.
Take care during cleaning that no liquid penetrates into the appliance. If liquid
is spilt on the balance, the latter must immediately be disconnected from the
electricity supply. The balance may only be used again after it has first been
checked by a service engineer.
The connections on the rear of the appliance and the power adapter may not
come into contact with liquids.
Regularly dismantle the weighing pan and the weighing pan holder and
remove any dirt or dust from under the weighing pan and on the weighing
machine housing with a soft brush or a soft, lint-free cloth, moistened with a
mild soap solution. The scale and the holder can be cleaned under running
water. Take
care that both parts are completely dry before they are re-installed on the
scale.
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Never use solvents, acids, alkalis, paint thinners, scouring powders or other
aggressive or corrosive chemicals for cleaning, since these substances attack
the surfaces of the scale housing and
can cause damage.
7 Transport, storage
7.1 Transportation and shipping of the weighing machine
Your weighing machine is a precision instrument. Treat it carefully. Avoid
shaking, severe impacts and vibration during the transportation.
Take care that there are no marked temperature fluctuations during the
transportation and that the weighing machine does not become damp
(condensation).
7.2 Storage of the weighing machine
If you would like to take the weighing machine out of service for an extended
period, disconnect it from the electricity supply, clean it thoroughly (see
Section 6 .Maintenance and servicing.) and store it in a place which meets the
following conditions:
No violent shaking, no vibrations
Minimum temperature fluctuations
No direct solar radiation
Minimum moisture
The weighing machine should preferably be dispatched and transported in the
original packaging to avoid transportation damage.
The weighing machine should preferably be stored in the original packaging,
since this provides optimal protection for the weighing machine.
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