Gram FR 320 User manual

SERIES
FR
320 / 500 / 3200 / 5000
OPERATION MANUAL

2
INDEX English
Safety information 4
Installation 4
Preparatory before using 5
Storage 5
Unfolding the package 5
Package list 6
Installation of the balance 6
Install the balance with wind shield 6
Install the balance with round weighing pan 7
Install the balance with square weighing pan 7
Connect the Power Adapter 7
Install the External Facilities 7
Warm-up Time 8
Adjust the Level Gauge Purpose 8
Display and keys description 8
Keys description 10
Calibration 10
Basic weighing 11
Counting mode 11
Percent deviation 12
Limits function 13
Set up no warning value without loading 15
Activate the limits mode 15
To exit the limits mode 16
User setups 17
Print setups 19
Setting the baud rate 20
Enabling weighing units 21

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Restoring the factory default setup 21
Backlight setup 22
Limits setup 22
No warning setup 23
Enabling the limit setup 24
Checking the high and low weight limits 24
Additional functions 25
Communication with a computer 25
RS-232 Interface hardware 27
Pin description 27
Routine maintenance and troubleshooting 28
Troubleshooting 28
Clearance 28
Clearing the stainless steel surface 28
Safety check 29
Troubleshooting 29
Technical conditions 31
Technical parameters 31
Guarantee 32

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ENGLISH
SAFETY INFORMATION
• To avoid unnecessary demage to the balance, please pay attention to the
following tips.
• Please do not use this balance in dangerous área.
• Only the trained technicians could operate this balance.
• Please turn off the power of the balance before connect it or disconnect it with
other facilities.
• If the environment requires a higher safety standard, please follow the relevant
installation instructions.
• Excessive electromagnetic interference will make the displayed value in this
balance change. Once the interference is dismissed, the balance could operate
in normal way.
• Please avoid any liquid on the surface of the balance. A piece of lightly damp
cloth is allowed to wipe the balance.
INSTALLATION
• Please make sure the local voltage is in line with the rated voltage on the
name board.
• Please pay special attention when use RS-232 as the pins location might
be incompatible with our facilities. Please check the pins locations before
the connection and turn off the connection of different configuration.
• If the facility or the power cord has apparent damage, please turn off the

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power, put it or them in a safe place and do not use it or them before they
are fixed.
• This balance could only be connected to our accessories or optional
fittings. We are not responsible for any modification the operator makes
to our balance, including using the facilities and cable which are not
supplied by us. However, we are always ready to offer the operation
norms information.
• Please do not open the balance. If the guarantee lable is damaged, our
quality guarantee will automatically cease being effective.
• If the balance does not work well, please contact your local distributor or
our customer service center.
PREPARATORY BEFORE USING
Storage
This balance requires an environment which is free from excessive high or
low temperature, corrosive, vibration, air current and collision.
Unfolding the package
• Unfold the package and check if there is any outer damage of the balance.
• If there is outer damage, please refer to section routain maintenance
and troubleshooting.
• Please keep all the package for possible transportation in the future.
When pack the balance, please remove all the cables to avoid unnecessary
damage.

6
Package list
• The balance
• Weighing pan
• Pan support
• Power adapter
• User manual
INSTALLATION OF THE BALANCE
Put it in a proper place, please avoid the following situations:
• Much heat and direct sunlight.
• Air currents and vibrations.
• Excessive moisture.
Usage Conditions
Please do not lay the balance in a quite damp palce for a long time. If the
balance is transferred from a lower temperature environment to a higher
temperature environment, please lay it there with power off foraround 2 hours.
Install the balance with wind shield
• Assemble the parts in the
indicated order.
4
3
2
1

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Install the balance with round weighing pan
• Installation Sequence.
• Pan support.
• Weighing pan.
Install the balance with square weighing pan
• Installation Sequence
• Pan support
• Weighing pan
Connect the Power Adapter
1
2
Only the power adapter offered by us is allowed.
• Connect the power adapter to the balance.
• Connect the power adapter to the power socket.
Install the External Facilities
Turn off the balance before connect it or disconnectit with external facilities
such as the printer or the computer).

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Warm-up Time
To assure the measure accuracy, the balance must be warmed up for 30
minutes before normal operation.
Adjust the Level Gauge Purpose
• Adjust the level guage of the balance. The level
guage needs to be adjusted once its place is
changed. The two front bottom bolts are used
to adjust the level guage.
• Spin the two bolts as shown in the figure until the
bubble in the level gauge is in the ceter of the circle.
• Normally, it needs to be adjusted repeatedly.
L
R
R
R
L
L
DISPLAY AND KEYS DESCRIPTION

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1. Capacity and readability.
2. Weighing mode signs: Inspect - inspect mode.
Count - counting pieces mode.
Denst - density mode.
Net - Tare weight / Gross weight/ Net weight.
3. Tare weight / Gross weight sign.
4. Weighing units.
5. Level gauge.
6. High / Low warning signs.
7. OK indicator (stable display).
OK - Reading shown is stable.
g - Reading shown is given in grams.
OZ - Reading shown is given in ounces (1g = 0.03527396200 oz).
ct - Reading shown is given in carats (1g = 5.0000000000 ct).
dwt - Reading shown is given in pennyweight (1g = 0.64301493100 dwt).
% - Reading shown is given in percent weight.
PCS - Reading shown is given in as a counting.
------- The balance is developing a stable reading.
UNABLE - Error operation.
HHHHH - The weight on the pan excedes the capacity of the balance.
LLLLLL – The pan is not properly seated or has been removed.

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KEYS DESCRIPTION
Calibration / Adjustment Key
Print / Output Key
Count / Function confirmation Key
Percentage Key
Unit conversion key
Tare Key
Menu Key
Power Key
CALIBRATION
To decide the accuracy of the balance through test the difference between
thereading and the actual weight of the object on the weighing pan.
Prerequisite of calibration:
1. There is no loading on the weighing pan.
2. Press the key.
3. The interior signals are stable.
Procedure
1. Adjust the level guage and warm it up for 25 minutes.
2. Press the key.

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3. Press the key, the display will read its full range, such as 3000.
4. Press the key repeatedly, it reads the calibration point within the
range (such as 2000, 1000…).
5. Choose one calibration point and place the right weight on the pan. Press
the key, the display will show CAL---.
6. When the external calibration is finished, the balance reads the value of
the weight on the pan (such as 3000).
BASIC WEIGHING
Procedure
1. Press the key , the balance will automatically proceed system
initialization and deduct the tare weight.
2. Place the container on the weighing pan
3. Press the key.
4. Place the simple object in the container.
5. Print the weight value pressing the key.
COUNTING MODE
Displayed sign: PCS

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Procedure
1. Place the empty container on the weighing pan.
2. Press the key.
3. Choose the amount of the reference samples. Press the key, the
balance reads “qTy10”, press the key, choose the number of
samples (10, 25, 50, 100). The bigger number, the more accurate for the
counting results.The choosed reference number will be saved until a
new reference number is set or the power is off.
4. Place the right samples on the weighing pan or in the container.
5. Press key, the balance reads the amount number of the samples.
6. Add the rest of ítems, the balance will show the total pieces.
7. If you want print the result, press the key.
8. To return to normal weighing mode, press the key, the symbol PCS
disappears.
PERCENT DEVIATION
Displayed sign: %
Procedure
1. Press the key.
2. Put the reference object on the weighing pan. When the reading is stable,
press the key, it reads “100.000” or “100.00”, which relates to the
accuracy 100.00% of the balance. Meanwhile, it displays %.

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3. Remove the reference object, the balance reads “0.000” or “0.00”.
4. Place the goal object on the weighing pan.
5. Wait for the OK on the display, read the display, the display indicates
percent deviation from the reference.
6. Press the key, the balance returns to normal weighing mode.
To test the percentage a weight in a container varies from a reference, please
follow the below steps:
1. Put a empty container on the weighing pan. Press the key.
2. Place the standard object into the container.
3. Press the key. Wait for the stable display, it reads “100.000” or
“100.00”.
4. Remove the container with standard object. Put another same
container on the weighing pan, wait for the stable display, it reads
“0.000” or “0.00”.
5. Add the goal object in the container, wait for tyhe stable display, the
value displayed is the percentage the weight of the goal object varies
from the standard weight.
6. Press the key to return to normal weighing mode.
7. If necessary, the weight of the goal object could be printed out.
LIMITS FUNCTION
To decide if the weight of the goal object is within the range.

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Display signs: LOW / HIGH (with warning sound of buzzer or OK).
Set up the highest and lowest weight values and start the limits function.
Procedure
1. Enter into menu mode pressing the key.
2. Press the key repeatedly until the display reads “INSPCT”.
3. Press key.
4. Choose inspect mode pressing key.
5. Set up the highest limit pressing .
6. Set up the decimal position pressing the key repeatedly until it goes
to right decimal point.
7. Confirm the accuracy pressing .
8. Set up the highest value as follows:
(to increase the value).
(to decrease the value).
value glittering.
to confirm.
9. Set up the lowest value, press the key.
10. Choose decimal point position pressing .
11. Press key repeatedly until it goes to the right decimal position.

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12. Confirm the accuracy pressing key.
13. Set up the lowest value as follows:
(to increase the value).
(to decrease the value).
value glittering.
to confirm.
Set up no warning value without loading
1. Press key repeatedly until to see “NoNres”.
2. Press key.
3. Set up the value as follows:
(to increase the value).
(to decrease the value).
value glittering.
to confirm.
Activate the limits mode
1. Press the key repeatedly until the display reads “ENABLE”.
2. Press the key.

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3. Press the key.
4. Put the goal object on the weighing pan
5. If the display shows “LOW” it indicates that the goal object weight is lower
than the low limit, if it reads “HI” also with buzzer warning sound, it means
the the goal object weigh is higher than high limit value, if it´s reads “OK”
means that goal object weight is within the low and high limits value.
6. If necessary, the limits result could be printed out pressing the key.
7. Remove the goal object from the balance.
To exit the limits mode
1. press the key.
2. Press the key repeatedly (“InSPCT”).
3. Press the key (“SET HI”).
4. Press the key repeatedly (“DISABLE”).
5. Press the key, the balance exits from Limits function.
To clear the low and high limits values
1. Press the key (“PrInt”).
2. Press the key repeatedly (“InSPCT”).
3. Press the key (“SET HI”).
4. Press the key repeatedly (“CLEAr”).

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5. Press the key to clear the limits value.
USER SETUPS
The balance could be set up to meet individual requirement.
1. Press the key to enter setup program.
2. Press the key to choose the parameter to be set up and then press
the key to confirm.
3. Anytime to exit the setup program, press the key, it reads “ESC”,
then press the to confirm.

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PRINT SETUPS
There are three print types:
STABLE Print: print a stable reading when it is attained.
INSTANT Print: print immediately after press the key.
INTERVAL Print: print at predeterminated time intervals.

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Note: The print function is separate from the line feed setup, i.e set the print
function first then set the number of line feeds.
To set the print type, use the following procedure:
1. Press the key the display will show “PrInt”.
2. Press the key, the display will show “STAbLE”, which indicates
stable print as the default.
3. Press the key to choose the print type and confirm pressing the .
4. Press the key until the display reads “InTEr”, press the key,
the display will show “SEC”.
5. Press the key repeatedly to see the predeterminated time interval and
press the to confirm. The message “0 SEC” means countinous print.
6. Press the key to return to weighing mode.
7. After entering print setup, press the key repeatedly to see
predetermined line feed (1-18) choose proper line feed and press the
to return to normal weighing mode.
SETTING THE BAUD RATE
1. Press the key.
2. Press the key, the balance reads “bAud”.
3. Press the key, the balance reads “300”.
4. Press the key repeatedly, the balance display the other baud rates.
Choose the proper rate and press key to confirm. The balance reads