KERN FTB Service Manual

Also see for FTB: Operating instructions Operating instructions

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KERN FTB Service Manual Manual pdf 57 page image

58 FTx/ITx-SH-e-07207.7.5 Choosing the resolution (SCALE –> Scale Build –> Resolution)The resolution must be specified when building a new scale using a terminal.Furthermore, the resolution has to be specified if the analog PCB is replaced, as its EEPROM is factory-set to a basic value.With compact scales FTx the resolution is indicated on the plate above the display and must be set to this value. Theresolution also needs to be set if a load cell of a different capacity is fitted. In this case the resolution must be enteredaccording to the load cell used (see technical data in Chapter 8 of this Service Manual). The available resolutions dependon the capacity of the weighing system.If it is a multi-interval scale or multi-range scale (see Chapter 7.7.1), this menu block can be accessed separately foreach weighing range ("RESOL. 1" to "RESOL. 3", depending on the number of weighing ranges). The additional blocks forresolution are displayed after the corresponding block for entering the capacity ("SCL.CAP 1" bis "SCL.CAP 3").7.8 Setting the GEO adjustment value (SCALE –> Geo Value)The geo adjustment value is used to adjust the weighing system to local gravity conditions (setting range 0 – 31). The tableof geo adjustment values can be found in Chapter 8. Caution: If the scale is calibrated at the installation site, the geo valuemay not be changed afterwards.The value can be changed with the and keys.7.9 Linearization with simultaneous calibration (SCALE –> LIN-CAL)In this menu block the weighing system can be linearized and calibrated simultaneously. The calibration is purelycomputational to compensate for shifts in the maximum load due to linearization. The loads placed on the pan are checked(±5%), so a basic calibration must already have been performed (see chapter 7.10).Procedure• First place a preload on the pan, then select the type of linearization/calibration required and confirm with :– 3-point linearization (default = 0%, 50% and 100% of the maximum load).– 5-point linearization (default = 0%, 25%, 50%, 75% and 100% of the maximum load).• Start the linearization/calibration. The display begins to flash as the scale automatically determines the zero point.Determination of the zero point can be interrupted manually with , in which case the existing zero point is used as areference. This is particularly useful if larger scales have already been loaded with heavy test weights, which would have to beremoved in order to determine the zero point.• Once the zero point has been determined, the display prompts you to load a weight (half load for 3-point linearization,quarter load for 5-point linearization). Change the weight if required with (available values depend on the capacityof the weighing system).• Once the weight has been placed on the scale and its value confirmed with , linearization is performed at the firstpoint. The display then prompts for additional weights (the number depends on the type of linearization chosen), whichagain can be changed if necessary. At the last linearization point the scale is also calibrated at the same time.Linearization/calibration can be cancelled at any time with the key.• Once linearization has been performed at all points, the display confirms that linearization/calibration has been successfullycompleted.