Gravity Measurement CWT7 Troubleshooting guide

Weighing Scale User and Service Manual
Please read this manual carefully before operation
----Important safety info
----Warranty
Model: CWT7
GRAVITY MEASUREMENT, INC.

CWT7 USER AND SERVICE MANUAL
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Important Safety Information
READ ALL INSTRUCTIONS BEFORE USING SCALES TO ENSURE MAXIMUM
SAFETY, BEST PERFORMANCE, AND TO GAIN KNOWLEDGE OF OUR SCALE,
IT IS ESSENTIAL THAT YOU OR ANY OTHER OPERATOR OF THE SCALE READ
AND UNDERSTAND THE CONTENTS OF THIS MANUAL BEFORE OPERATING
THE DEVICE.
When using an electrical device, basic precautions should always be followed,
including the following:
1. Please use only the original power cord or DC adapter supplied with the scale.
Other cords or adapters may damage the scale.
2. DC adaptor is used to charge the battery, and scale can operate without DC
adaptor.
3. Avoid using long power extension cords –this may cause interference
4. Do not use on surfaces or in areas where vibration, air movement or
temperature change.
Do not place in direct sunlight or near air conditioning vents.
5. Avoid high humidity (greater than 80%) that might cause condensation and
keep away from direct contact with water and other corrosive chemicals.
6. Static may influence the weighing result. To reduce the static, wipe the pan an
dscale with anti‐static wipes.
7. Don’t impact or drop heavy objects on the scale – this may affect accuracy, or
cause damage. Do not stack material on the scale when it is not in use.
8. Battery should be removed if the scale is not used for along period of time.
Battery should be recharged every 3 months.
9. Place items to be weighed as close to center of the pan as possible
10.Only use fingers to operate the keypad. Do not press with hard or sharp
objects.

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Warranty
Gravity Measurement, Inc. (Schenectady, New York) offers one-year limited
warranty (parts and labor) for the components failed due to defects in materials or
workmanship. Warranty starts from the date of delivery.
During the warranty period, should any repairs be necessary, the purchaser must
inform its supplier or Gravity Measurement. The company or its authorized technician
reserves the right to repair or replace the components at any of its workshops
depending on the severity of the problems. However, any freight involved in sending
the faulty units or parts to the service center should be borne by the purchaser.
The warranty will cease to operate if the equipment is not returned in the original
packaging and with correct documentation for a claim to be processed. All claims are
at the sole discretion of Gravity Measurement.
This warranty does not cover equipment where defects or poor performance is due
to misuse, accidental damage, exposure to radioactive or corrosive materials,
negligence, faulty installation, unauthorized modifications or attempted repair or failure
to observe the requirements and recommendations as given in this User Manual.
Additionally, rechargeable batteries (where supplied) are not covered under warranty.
Repairs carried out under the warranty does not extend the warranty period.
Components removed during the warranty repairs become the company property.

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What Is Inside Box
AC/DC adaptor (110V)
CWT7 weighing scale, with adhesive film covered platter. Two parts are separated to protect
the load cell during transportation.
Rechargeable battery is installed inside the scale.
Two wire seals. The wire seal is used usually by the inspector of Department of Weight and
Measure or authorized dealer. The wire seal is threaded through a metal rode that protrudes
through the bottom of the device and through a hole in the scale base adjacent to the metal
rode.
Set up the Scale
Place the scale on a stable, level surface out of the way of air currents. The scale must
be level during use. Adjust the feet and use the integrated bubble at the front of the
scale to achieve level. Be sure that scale does not rock back and forth. Ensure no
weight is on the pan when turning on the scale. Scale is operated using the
rechargeable battery or AC adaptor. is used to charge the battery, and scale can
operate without DC adaptor.
LCD Display
Size: 130 mm x 46 mm X 2.8 mm
Font height: 30 mm
Segments: 6 or 7??

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Key DESCRIPTION
BASIC FUNCTION OPERATION
Press and hold this key for 2 seconds to turn off the balance.
Press this key to turn on the balance
UNITS To select the desired weight unit.
ESC To exit from setup mode.
ZERO To reset the weight to “0”, but the display value has to be
lesser than ± 2% of maximum capacity.
To move one space to the left or downward in setup mode.
TARE To subtract the container´s weight.
To move one space to the right or upward in setup mode.
N/G To view gross or net weight when the balance is on tare status.
All other keys will be disabled when gross weight is activated.
To increase value in setup mode.
PRINT Manually transmitting data through RS232 to print.
Confirmation in setup mode.

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BASIC PARAMETER SETTING
To access to functions setting, press the and key at the same time in
weighing mode, and LCD displays U F - 1 . Press key to rotate U F - 1 to U F - 9
“*”This flag indicates that the function is locked when “Approval Version”.
UF- 1 A/D count
1. Press the key to view the A/D count.
2. Press the key to view the the battery voltage or press the key to exit
back to menu UF- 1
3. To move to next parameter press the key.
4. To exit and return to normal weighing press the key.
UF- 2 High / Low limits setting
1. Press the key to enter.
2. The display will show 00. 0 0 0 L (set low limit).
3. Use the keys and to move cursor and press the to select
number.
4. Press the key to confirm.
5. The display will show 00. 0 0 0 H (set high limit).
6. Use the keys and to move cursor and press the to select number.
7. Press the key to confirm.
8. The display will show o .000 ,look at the remarks below.
9. Use the keys and to move cursor and press the to select number.
10. Press the key to confirm.
Remarks: 0 0 0
A B C
A --- Buzzer on: 0= Stable not required 1= Stable required
B –- LCD indicator and RELAY on: 0= Stable not required 1= Stable required
C : Buzzer beeps when: 0= Buzzer off 1= OK 2= LO and HI
Low limit set as 0 will clear all check weigh values.
This function is locked when UF-5 is set as “HoLD 1”

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UF- 3 Auto-power off
Modes: AoFF00:Auto-turn off disabled.
AoFF01 : The balance will automatically turn off after 1 minute of inactivity.
This time can be set up to 99 minutes.
1. Press the key to access to auto-power configuration.
2. Use the keys and to move cursor and press the to select
number.
3. Press the key to confirm.
UF- 4 Backlight setting
Modes: lit a : Automatic
lit on: Backlight on
lit oFF: Backlight off
1. Press the key to access to backlight configuration.
2. Use the key to select the desired mode.
3. Press the key to confirm.
UF- 5 HOLD function (*)
Modes: HoLd 0 Disable
HoLd 1 Animal (motion) Hold function
HoLd 2: Peak value hold (when held can press any key to cancel)
HoLd 3 Stable hold (when held can press any key to cancel)
HoLd 4 Stable hold (when held can auto cancel at zero)
1. Press the key to access to hold function configuration.
2. Use the key to select the desired mode.
3. Press the key to confirm.
Remarks: HoLd 1 :
1. Press the key will show PCT00 2

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2. Use the keys and to move cursor and press the to select
number, this can set the range from 001 ~ 100 units of the animal hold.
3. Press the key will show TiME 8
4. Use the key to select 1,2,4,8,16,32 or 64 times within the hold range.
5. Press the key to confirm.
UF- 6 RS-232 Output
1. Press the key to enter.
2. The display will show 2 3 2 1 .
3. Press the key to select the modes.
4. Press the key to confirm,and will show b 9 6 0 0 .
5. Use the key to select the baud rate.
6. Press the key to confirm.
Modes: 2 3 2 0 : RS-232 disable
2 3 2 1 : Stable output –Format 1
2 3 2 2 : Stream output –Format 1
2 3 2 3 : Manual output –Format 1
2 3 2 4 : Stable output –Format 2
2 3 2 5 : Stream output –Format 2
2 3 2 6 : Manual output –Format 2
2 3 2 7 : Manual accumulate output –Format 3
2 3 2 8 : Auto accumulate output –Format 3
2 3 2 9 : Manual accumulate output –Format 4
2 3 2 1 0 : Auto accumulate output –Format 4
2 3 2 1 1 ~ 2 3 2 1 3 : LP50 printer is used
Baud rate B 1200 : Baud rate 1200
B 2 4 0 0 : Baud rate 2400
B 4 8 0 0 : Baud rate 4800
B 9 6 0 0 : Baud rate 9600
B 1 9 2 0 0 : Baud rate 19200
B 3 8 4 0 0 : Baud rate 38400
Remarks:
Format 1 o u tp u t e x am pl e s :
Format 2 o u tp u t e x am pl e s :
Format 3 o u tp u t e x am pl e s :
S/N WT/lb
---------------
0001 2.205
0002 2.205
---------------

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Format 4 o u tp u t e x am pl e s :
Format 3 and format 4 if you want to print the total weight, press the key
twice, and the accumulative weight will be removed.
Communication Protocol:
UART signal of EIA-RS232 C
Format:
1. Baud rate: 9600
2. Data bits : 8 bits
3. Parity bits: None
4. Stop bits : 1 bit
Format 1 (232 1 –3):
HEAD1 (2 BYTES)
HEAD2 (2 BYTES)
OL –Overload
ST –Stable
NT –Net weight
US –Unstable
GS –Gross weight
F i x ed 18 B Y T E S AS C II ( k g g t lb )
1
2
1
1
2
1
1
2
3
4
5
6
7
8
1
2
1
2
H E AD1 , H E AD2 , DA T A U N IT CR LF
F i x ed 21 B Y T E S AS C II ( t l. T lbo z)
1 2 1 1 2 1 1 2 3 4 5 6 7 8 9 1 2 3 4 1 2
H E AD1 , H E AD2 , DA T A U N IT CR L F
F i x ed 19 B Y T E S AS C II ( p c s )
1
2
1
1
2
1
1
2
3
4
5
6
7
8
1
2
3
1
2
H E AD1 , H E AD2 , DA T A U N IT CR L F
TICKET NO.0001
G 3.000lb
T 1.000lb
N 2.000lb
TOTAL NUMBER
OF TICKETS 0001
TOTAL
NET 2.000

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UF- 7 Speed setting (*)
Modes: spEED1: Standard speed
spEED2: High speed
spEED3: Low speed
1. Press the key to enter.
2. Press the key to select the desired mode.
3. Press the key to confirm.
UF- 8 Zero tracking(*)
Modes: Zp 0 : OFF
Zp 1 : One division tracking at zero
Zp 2 : Two division tracking at zero
Zp 3 : Three division tracking at zero
Zp 4 : Four division tracking at zero
Zp 5 : Five division tracking at zero
1. Press the key to enter.
2. Press the key to select the desired mode.
3. Press the key to confirm.
UF- 9 G Value setting
1. Press the key to display the G value of manufacture place.
2. If set the G value of local press the key and then press the or
key and key to input the new G value.
3. Press the key to confirm.

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Advanced Functions
Warning: Due to regulation by Bureau of Weights and Measures of each State, for the
scales legal for trade, weight calibration is conducted by authorized dealers or your
local metrology workers using a known standard weight. Weight calibrations are
usually locked for end user, and therefore those functions are not accessible (Table).
Wrong operation by end user may cause the compliance issue or wrong performance
of the scale
Table: Availability of UF, ECF, and LF Functions with Calibration Switch
Location and Type Approval Settings
The following instructions are intended for trained scale dealers/distributors, state
inspectors.
Weight Calibration ECF1-ECF3
To enable weight calibration and other advanced functions, calibration switch inside
the scale must be at on position and LF6 has to set to nonE.
1. In weight mode, press the and keys, the display will show ECF- 1 .
2. Press the or key to select E C F - 1 , ECF- 2 or ECF- 3 .
ECF-1 Zero and Span Calibration
1. Press the key to enter, display will show cALZ.
2. Press the key to calibrate zero point.
3. The display will show the calibration weight 006 . 0 0 0 . Depending on the capacity,
your value can be different.
4. Use the keys and to select the digit, and press key to input
the weight value.
5. Put the calibration weight on the platter and press the key to calibrate.
The scale will return to weighing mode automatically.
Calibration
Switch
Location
Type
Approval
LF6
UF 1-9
ECF 1-3
LF
OFF
oiML
UF5, UF7, UF8, and UF9
are not available
No
No
OFF
nonE
UF5, UF7, and UF8 are
not available
Yes
Need
password
ON
oiML
UF5, UF7, and UF8 are
not available
No
Yes
ON
nonE
All functions are available
Yes
Yes

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ECF-2 Zero Calibration
1. Press the key to enter, display will show cALZ.
2. Press the key to calibrate zero point.
3. The scale will return to weighing mode automatically.
ECF-3 Span Calibration
1. Press the key to enter, display will show the calibration weight 0.
2. Use the keys and to select the digit, and press key to input the
weight value.
3. Put the calibration weight on the platter and press the key to calibrate.
The scale will return to weighing mode automatically.

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Locked Function (LF) Operations
CAL switch has to be ON (which is located inside the scale. You have to open the hole
at the back to get access to CAL switch. Password required when CAL switch is OFF.
Keep pressing the【ZERO】key (no releasing) while turning on the indicator. After self-
checking finishes, it displays P 0 0 0 0 . Input the password P 0 0 2 0 , and then press
【Print】to enter the parameter setting mode
*Press【ZERO】key or【TARE】key to shift between functions LF-1 ~ LF-8.
*Press 【Zero】【 Tare】【 N/G】to move and change the digits
*Press 【UNIT/ESC】to quit and the indicator will restart for normal weighing mode
LF1 Weight Calibration
Press【Print】key to enter zero calibration CALZ.
Make sure nothing on the platform of the scale and press 【M+】to finish zero
calibration
Display the full capacity 0300.00
*Full capacity weights recommended for calibration of the scale, or at least 60% F.S.
to assure the accurate weighing, it’s not allowed to do with 1% F.S weight or more than
100%F.S.weight.
Change the display value to be the same as the test weight.
Press 【Print】, the digits will twinkle
Place the test weights on the platform (example of 300Kg)
Press【Print】until the indicator recognizes the weight correctly.
Finish of calibration.
LF2 Parameter Setting
Press【Print】key to enter parameter setting mode and it will display the internal A/D
value.
Press【Print】key to set the weight units 1 1 0002 (both kg and lb units are enabled
with calibration using unit lb)
110002
ABCDEF
A0= disabled 1=Kg 2=Ton 3=g
B 0= disabled 1=lb 2=lb/oz
C 0= disabled 1=TW Kg 2=HK kg 3=VISS
D0= disabled 1=PCS off 2=PCS ON
E 0= disabled 1=Multi interval 2=Multi range
F1=Calibration In Kg 2=Calibration in lb

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1 1 0022 (both kg and lb units are enabled with calibration using unit lb, dual range)
1 1 0 122 (In addition, PCS is on, and therefore used as a counting scale)
Press【Print】key to set the capacity of the scale 000300
Press【Print】key to set the decimal point d P 0 . 0 0
Using【Zero】key or【Tare】key to shift it from 0.0 until 0.00000
Press【Print】key to set the division d i v 0 1
Using【N/G】key to shift it between 01/02/05/10/20/50
LF3 Linearity Calibration
Press【Print】key to set the linearity calibration W 0
Press 【 ON/T 】 key to enter next step W 1
Put 1/3F.S. test weight and press 【 ON/T 】 to enter next step W 2
Put 2/3F.S. test weight and press 【 ON/T 】 to enter next step W 3
Put 100%F.S. test weight and press 【 ON/T 】 to enter next step W 4
Press 【Print】key to exit and back to LF- 3
LF4 A/D Converting Speed
The same operation as Weighing Speed
*It was blocked when UF-5 set of HOLD 1
*1=15Hz 2=30Hz 3=7.5Hz
LF5 Zero Tracking
The same operation as UF 8 Zero Track
*It was blocked when UF- 5 set of HOLD 1(animal weighing)
LF6 Type Approval
nonE is for non-certified scales, and oiML is for NTEP (United States) or OIML
(Europe)
LF7 Gravity Adjustment
The same operation as UF 9 Gravity Adjusting
LF8 Zero
Press【Print】key to set the initial zero function SEtZ Y
yReset of the zero point each time when the scale switches on
nDisable resetting zero when switching on the scale

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Error Messages and Troubleshooting
Error Display
Meaning
hhhhhh
Overload
Weight on pan exceeds maximum
capacity
LLLLLL
Weight is too low
Weight is too low at the negative
------
Price is out of range
Total price exceeds 999999
E r r n
Weight unstable
Vibration or varying load on the pan
during switch-on
E r r H
Initial zero too high
Scale turned on with weight > 10% of
maximum capacity already on the pan
E r r L
Initial zero too low
Scale turned on with upward force >
10% of maximum capacity acting on
the pan
Battery symbol
visible
Battery voltage is lower
than 5.6 V
Battery neds charging. Connect to
main adaptor. Press 【T】and
【6】together to view battery
voltage. Press 【CE】to return to
weighing mode
Battery symbol
flashing
Battery voltage is lower
than 5.5 V
Battery needs charging. Connect to
main adaptor
Scale
automatically
shuts off
Battery voltage is lower
than 5.4 V
Battery needs charging. Connect
main adaptor
Table: List of UF, ECF, and LF
Function
Description
UF1
Display A/D count, Battery Voltage
UF2
High / Low limits setting
UF3
Auto-power off
UF4
Backlight setting
UF5
HOLD function
UF6
RS-232 Output
UF7
Speed setting
UF8
Zero tracking
UF9
Gravity Adjustment
ECF1
Zero and Span Calibration
ECF2
Zero Calibration
ECF3
Span Calibration
LF1
Weight Calibration
LF2
Parameter Setting

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LF3
Linearity Calibration
LF4
A/D Converting Speed
LF5
Zero Tracking
LF6
Type Approval
LF7
Gravity Adjustment
LF8
Zero
Order information

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Parts
LCD display Part # 20351006
Leoch Maintenance-free Sealed Lead-acid Rechargeable Battery
DJW6-5.0 (6V 5.0AH)
Constant voltage charge
Standby use: 6.75-6.90 V
Cycle use: 7.2-7.5 V
Initial current: less than 1.5 A
Leoch Maintenance-free Sealed Lead-acid Rechargeable Battery
DJW6-4.0 (6V 4.0AH)
Constant voltage charge
Standby use: 6.75-6.90 V
Cycle use: 7.2-7.5 V
Initial current: less than 1.2 A
AL-FURAAT Valve regulated Sealed Lead-Acid Rechargeable Battery
AF4.5-6 (6V, 4.5AH)
Constant voltage charge
Standby use: 6.75-6.90 V
Cycle use: 7.2-7.5 V
Initial current: less than 1.35 A

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GRAVITY MEASUREMENT, INC.