OPERATION MANUAL FOR W4-2 SCALES 28-Oct-2001
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS PAGE 2 of 13 1. INTRODUCTION ......................................................................................................................3 2. OPERATION - W4....................................................................................................................3 2.1 OPERATOR MODE .................................................................................................................. 3 2.2 SUPERVISOR MODE........................
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 1. PAGE 3 of 13 INTRODUCTION The W4-2 scales controllers provide all the functionality required to implement a mobile or fixed weigh scales solution in the NOMAD system. The standard controller accepts up to four load cells. Power is supplied by internal rechargeable batteries and charger with a universal voltage range is built in. 2. OPERATION - W4-2 There are two modes of operation - operator and supervisor mode.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS PAGE 4 of 13 Enter the row number from which the fruit was picked. A maximum of 5 digits are allowed. After entering the row number the controller will monitor the weigh platform for stability. If the platform is not stable the phrase “Acquiring Weight” will be displayed and the platform monitored for a preset period. If during that period the weight doesn’t become stable an error message will be displayed “WEIGHT NOT STABLE” accompanied by a triple beep.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 2.2.1 PAGE 5 of 13 Clock In Place the operators picking basket(s) on the scales. Enter ‘1’. The controller will prompt for the operators number. After entering the operators number the controller will monitor the platform for a stable weight. The stable weight will be entered as that operators tare value. The time and operator number will be transmitted to the NOMAD system as a clock on message.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS PAGE 6 of 13 The break duration and job number are defined in NOMAD Central system setup. Two entries will actually be made by this command - a break entry timed at the current time and a “picking” entry timed at the current time plus the break duration. 2.2.5 Free Weigh To aid verification of the scales and to allow general weighing to be performed a “Free Weigh” mode is available. Enter ‘5’.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 3. PAGE 7 of 13 USE OF TRANSPONDER TAGS The scale may be used with contactless transponders. The transponders themselves are credit card sized and derive their power from the radio signal that interrogates them. The transponders are normally fixed to a harvesting cart such that they pass the reader as the cart is loaded onto the weight platform.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS PAGE 8 of 13 CHG1 The battery is very discharged and is being slow charged. When sufficient charge has been put into the battery it will switch to fast charge. CHG2 The battery is being fast charged. When the battery is fully charged it will switch to trickle charge. CHG3 The battery is fully charged and is now being trickle charged to maintain its charge. A fully discharged battery will take around 7 hours to recharge. 5.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS PAGE 9 of 13 2. Press ‘8’ then ‘ENT’. 3. Enter ‘93010001’. The raw value for cell #1 will be displayed in decimal and hexadecimal (the 2 leading digits of the hexadecimal value are status flags). Verify that the correct cell is selected by applying a load to the cell and observing the change in the display. Remove any load from the display and prepare to place calibration weight on the cell. 4. Enter ‘93010004’.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 3. 4. 5.3 PAGE 10 of 13 Enter ‘9303yxxx’, replacing the ‘x’s with the desired node number and the ‘y’ with the system number (usually 0). The scales will restart. Note that the current node number is displayed during start-up. CLEARING THE MEMORY The memory should be cleared if the controllers batteries have been allowed to completely discharge for more than 2 weeks. 1. 2. 3. 4. 5.4 Ensure the scales are in supervisor mode. Press ‘8’ then ‘ENT’.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 5.4.2 13 Timeout 1. 2. 3. 4. 6. PAGE 11 of Ensure the scales are in supervisor mode. Press ‘8’ then ‘ENT’. Enter ‘93070xxx’ (replace the ‘x’s with the desired timeout in 1 second increments). The scales will restart. CONNECTING THE SCALES Each load cell should be terminated in a DB9 plug (pin contacts) as follows. 1. 2. 3. 4. 5. 6. 7. 8. 9.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 7.2 PAGE 12 of 13 REPLACING THE CIRCUIT BOARD If it is necessary at any time to remove the circuit board pay careful attention to the location and type of screws employed. Use a #1 POSIDRIV screwdriver.
NOMAD™ - W4-2 SCALES OPERATING INSTRUCTIONS 8. 13 SPECIFICATIONS Power Average Consumption Charging Input Load Cells Impedance Excitation Sensitivity Radio Link Frequency Tag Reader Frequency 8.1 PAGE 13 of 8.4V battery pack. 100mA 15V DC @ 450mA max 300 - 1000 Ω 5V 0.6µV (0.003% FS) 916.5MHz ± 0.2MHz 125kHz ± 0.1kHz CERTIFICATION This device complies with part 15 of the FCC rules.
