KEEPS YOU GOING.

LIFTTRUCK
WEIGHING
SYSTEM
OPERATING MANUAL

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TABLE OF CONTENTS
1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Explanation of the weighing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3. CALIBRATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4. CONFIGURATION MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5. INDICATOR OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6. ATTACHING OTHER DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7. CARE AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

8. INDICATOR ERRORS AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Read instructions carefully!

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TVH is a supplier of after-market spare parts and accessories that are suitable for the maintenance and repair of OEM equipment.

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1. INTRODUCTION

Rinstrum R320 weight Pressure Fork height Operator guide

indicator, with two pre-wired transducer labels (plus this operating
cables, power fuse and (has JIC/UNF manual)
mounting bracket 9/16-18 hydraulic
connection)

1.1. Explanation of the weighing system

The hydraulic pressure in the forklift’s main lift line is directly related to the weight
loaded on the forks. This means that the weight can be determined by measuring
hydraulic pressure and performing some calculations.

The process is:

1. The hydraulic pressure is measured using a pressure transducer (installed in the
main lift line).
2. The indicator reads the signal from the pressure transducer. It then converts the
measured pressure to weight (in kg).
3. The indicator displays the weight to the operator.

Note: It is important that the weight is always measured with the forks at the same
height. This increases measurement accuracy. Other items which may affect the
measurement are: a mast which is not vertical, old hydraulics or very new hydraulics.

1.2. Specifications

Operating temperature –10 to 50 °C ambient. Humidity < 90% non-condensing

Storage temperature –20 to 50 °C ambient
IP-rating Indicator: IP65; pressure transducer: IP67
External materials ABS, silicon, nylon, acrylic (halogen free), SS304, 17-4PH SS
Power supply 7 to 24 VDC, 0.5 Amax
Power fuse 1 A slow blow, 20 x 5 mm (located behind rear cover of
indicator)
Hydraulic connections JIC/UNF 9/16-18
Rated pressure 5000 psi
Outputs RS-232 printer output
2 isolated transistor drive outputs (300 mA total at 12–24 VDC)
Battery backed dock/calendar Battery life 10 years minimum

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2. INSTALLATION
Step 1: Connect the pressure transducer to the main pressure lift line.
• The pressure transducer has a JIC/UNF 9/16-18 hydraulic connector (for use
with JIC/UNO 9/16-18 fitting).
• Connection can be made where convenient. There may be a spare socket on the
manifold, or it may be necessary to drill/tap into the manifold, ram or other fitting.
Caution: When drilling and tapping, ensure that no waste enters the hydraulic system.
• The pressure transducer can be mounted directly or via a length of hydraulic hose.
It should be mounted securely and in a location where it is unlikely to be damaged.
• Ensure that all air is bled from the hydraulics.

Step 2: Mount the indicator.

• The metal mounting bracket can be removed from the indicator for easy installation.
• Mount the indicator where the operator can comfortably use it.

Step 3: Connect the pressure transducer to the indicator.

• Plug the 4-pin connector (pre-wired to the indicator) into the pressure transducer.
• Route the cable where it can be secured and is unlikely to suffer damage. Bundle any
excess cable.
• Restrain the cable securely (with cable ties). Vibration can damage loose cables.

Step 4: Connect power to the indicator using the 2-wire cable.

• Suitable power: 7–24 VDC (maximum current: 0.5 A).
• Wire colours: red: positive, black: negative.
• The power wires can be connected directly to the main battery, to a circuit in the
forklift ignition, or any other circuit with suitable power.
Note: The indicator contains a fuse inside the rear cover of the indicator.
• If suitable voltage is not available, a voltage converter should be installed to produce a
voltage within range.
• Route the cable where it can be secured and is unlikely to suffer damage. Bundle any
excess cable.
• Restrain the cable securely (with cable ties). Vibration can damage loose cables.

Step 5: Apply the fork height labels.

• These labels must be clearly visible to the operator. They mark the height 1
where weighing will occur.
• Labels 1 and 2 are attached to the fixed mast. is attached to the
2
moveable mast.
• 1 should mark a height where the forks are 400–800 mm off the ground.
• 2 should mark a location approximately 200 mm lower than 1.

Step 6: Apply the operator label.

• This label should be applied where the operator can read it while operating the forklift.

Step 7: Calibrate the scale.

• Follow the instructions in “Calibration” below.

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3. CALIBRATION
Before calibration, switch the indicator off and on again (see the operator guide).

Step 1: Start calibration process

Hold both keys for 2 seconds.

Step 2: Enter the scale capacity (the maximum load of the forklift)

Press until the correct

scale capacity is shown.

Step 3: Do zero calibration

Zero calibration
Lift empty forks to 1, in progress.
then lower slowly to 2
(as per normal weighing).

Step 4: Enter the weight of the test weight

Enter the weight of the test weight.

Move cursor: . Edit digit:

Step 5: Do span calibration

Load test weight onto forks. Span calibration Calibration is

Lift forks 1 , then lower slowly in progress. finished.
to 2 (as per normal weighing).
weighing).

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4. CONFIGURATION MENU
The indicator has a menu system which holds several key settings (see the list of settings
below). For most applications, these settings do not need to be changed.

Step 1: Enter the menu

If a passcode has been set, it will need to be entered. Use
Hold
for 2 seconds. and to enter the passcode, then press .

Step 2: Choose a setting

Press repeatedly until the required setting is shown.

Step 3: View/edit the setting

If required, edit the setting
Press to view Press to close
the setting. using and the editor.

Step 4: Exit the menu

Hold for 2 seconds.

Setting Description Details

OLOAD Overload count The number of times the weight has exceeded 150% of scale
capacity.
Operation: Press “TOTAL” to show the overload count. To clear
the count, press “HOLD”, “ADD” then “HOLD”. To exit without
clearing the count, press “ZERO”.
UNITS Weight units Default: kg
SCALE Scale capacity Default: 5000 kg. Note: Also set during calibration.
RES Scale resolution Default: 10 kg. Note: Also called “division size”.
FILTER Weight averaging Weight readings are averaged to get a stable weight.
Default: 1.0 s
Z.BAND Zero band The maximum weight which is considered to be 0.
Default: 20 kg
AC.BAND Acceptance band Used by the filter/hold system to ensure valid weights. A valid
AC.LEN Acceptance length weight must be within AC.BAND for time AC.LEN.
AC.BAND default: 5 kg / AC.LEN default: 2.0 s
PRINT Printout format Default: Single. Note: Used with printinq only.
PAPER Paper out detection Default: Off. Note: Used with printing only.
CLOC Set date/time Note: Used with printing only.
PCODE Passcode A passcode can protect entry to the menu and calibration.
Default: 0 (disabled)
TEST Signal test Show pressure transducer signal (in mVN).
DEF.ALL Default all settings Operation: Press “TOTAL”, “ADD” then “HOLD”.
Warning: This will reset calibration, settings, totals, etc.
-END- Menu exit

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5. INDICATOR OPERATION

Power ON: Hold for 1 second Power OFF: Hold for 4 seconds

Weighing

If indicator isn’t Lift forks to 1, After a few

ready, lower the then lower slowly seconds, the
fork to the ground to 2 weight will be held
for a few seconds. and H will appear.

Add weight to totals

Weigh as normal Add weight The display will show “ADD”,

(described above). to the total. then the ttal weight.

Clear Totals

Hold for 2 seconds.

View total weight (and number of pallets)

Total weight Total number

of pallets

Note: Total display will automatically cancel after 5 seconds.

Switch between the 2 truck totals

1 2 1
Truck total 1 Truck total 2 Truck total 1
Note: The indicator keeps 2 separate totals. These can be used to totalize 2 trucks at the
same time (or 2 axles on a single truck).

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Reset Zero

Manual weighing
The indicator has an additional weighing mode called “Manual weighing”

Operation:
• Hold the “Hold” key for 2 seconds to enter (and exit) this mode. Display will show
“HOLD” when switching to manual weighing (or “FILTER” for normal weighing).
• Press the “Hold” key to hold the weight. Press the “Hold” key again to un-hold.
• All other operations remain the same in this mode ( including totalizing).

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6. ATTACHING OTHER DEVICES
There are 2 types of additional devices which can be attached to the indicator:
• docket printer, and
• overload alarm (such as a buzzer or warning light)

Attaching a printer
The indicator can drive most RS-232 docket printers. It can be set to print individual
pallets and total weight, or total weight only.

Remove the Indicator Printer DB9-M Pinout

rear cover of TXD RXD 3
the indicator GND GND 5
to access the DTR DTR 4
connections. Note: DTR is used for paper out detection

Attaching an overload alarm

An output switches on when the weight exceeds scale capacity. This can be used to alert
the operator by connecting a warning light or buzzer.

Indicator Connect to
Remove the Common output 12–24 VDC power
rear cover of Output 1 Alarm +
the indicator Common output
Output 2
to access the Output 1
Alarm Connect to
connections. Alarm + Indicator: output 1
Alarm – 0 VDC power

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7. CARE AND MAINTENANCE
This weighing system is designed to run for many years with very little maintenance.
However, to maintain accuracy, it is recommended that a calibration schedule be
followed.

Calibration schedule
It is recommended that:
• A zero is performed regularly (as per operator guide). It requires less than 1 minute
and can be done each day before use.
• A calibration is performed every 12 months (see the Calibration section).

Cleaning
Wipe the indicator with a soft cloth slightly dampened with warm soapy water. Never use
harsh abrasive cleaners or solvents.

Disposable, protective front covers are available for the indicator. These are used in
particularly dirty applications (i.e. environments with concrete dust, paint spray, etc).

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8. INDICATOR ERRORS AND TROUBLESHOOTING
System/hardware errors
Error Description Resolution
E0001 The power supply voltage is too low. Check supply/cable
E0002 The power supply voltage is too high. Check supply/cable
E0010 Temperature error Check location
E0100 The setup or calibration has been lost. Re-calibrate
E0200
E0400 The factory information has been lost. Return for Service
E0800 The EEPROM memory storage chip has failed. Return for Service
E2000 ADC Out of Range error Check transducer/cable
Note: These errors are summed and displayed in hexadecimal (A: 10, B: 11, etc).

User/interface errors
Error Description
ER.SPAN Span calibration has failed because:
• insufficient weight was loaded during the span calibration, or
• menu option RES is too low or too high, or
• the pressure at the entered scale capacity is beyond the measurement limit.
Check the settings and re-calibrate.
MAX.CNT The number has exceeded the maximum value possible.
STABLE ERROR The indicator timed out while waiting for the weight to become stable. Retry.
ZERO ERROR Zero has failed because the weight was outside the valid range.
Ensure that there is no load on the forks and retry.
------ The operation you have requested is not available.
O.LOAD The weight on the forks is over or under the valid range.
U.LOAD Decrease/increase the load on the forks.
ENTRY DENIED The passcode was entered incorrectly. Retry.

Troubleshooting
Problem Items to check
The indicator • Check the fuse. It is located inside the rear cover of the indicator.
will not start • Check the power wires (check the voltage at the indicator).
• There may be a fault with the transducer. Unplug it.
The indicator • The indicator buzzes to signal overload. Re-calibrate (as described in the
buzzes Calibration section).
continuously • The pressure transducer or its wires may be faulty. Check the signal
(under various loads) using “TEST” in the menu.
The indicator • Reset Zero (as described in the Indicator Operation section).
does not • Ensure load is completely free of the ground when measuring. The forklift
measure should not be moving, and the mast should be vertical.
accurately • Re-calibrate (as described in the Calibration section).
• For forklifts with multi-stage masts, ensure that only the first has moved when
weighing (otherwise the weight of other masts may be added).
• Hydraulics are less consistent when new or very old.
Indicator is not • Reset Zero (as described in the Indicator Operation).
“READY”

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