OHAUS CKW-55 Service Manual

Also see for CKW-55: Instruction manual Installation and operation instructions Quick start guide

Contents

OHAUS CKW-55 Service Manual Manual pdf 40 page image

3-20CHAPTER 3 INDICATOR TESTING3.8 EXTERNAL INPUT TESTINGThe CKW-55 Indicator I/O menu contains an INPUT menu item that is used to define a function to becontrolled by an optional external input device such as a foot switch. The switch must to be a momentarycontact type and the contacts must be normally open.Table 3-3 identifies the various commands that can be set up to be activated when the external switchinput is momentarily closed.TABLE 3-3. EXTERNAL INPUT SELECTIONS.To set up the input functions, enter the menu I/O settings.This menu item is used to define a function to be controlled by an optional external input device such asa foot switch.Selections are:Off = The external input is disabled.Tare = The external input initiates a Tare function.Zero = The external input initiates a Zero function.Print = The external input initiates a Print function.Units = The external input changes to the next available weighing unit..GNT = The external input simulates the function of the G/N/T button.Accumulation = The external input increments a weighment totalizing function.Start-Stop (S-S*) = The first external input signal enables the output relay operation,(Start). The second external input signal disables the relayoperation, (Stop).Tare-Start-Stop (T-S-S*) = The first external input signal initiates a Tare function. Thesecond external input signal enables the output relay operation,(Start). The third external input signal disables the relayoperation, (Stop).Note: Start-Stop and Tare-Start-Stop are only available when the Relay Option is installed. When selected,pressing the NEXT +/- button will have the same effect as if a switching signal was received from anexternal device. The accumulate function is not available if either of these I/O selections are made.To test external input functions, proceed as follows:1. Disconnect power from the Indicator. (Remove the line cord plug from the power source.)2. Open the Front Housing, refer to procedure 4.1.3. Connect a cable containing a test switch (normally open contacts) to connector J7 on the MainPC board.Note: Do not attempt testing by momentarily touching the screw contacts on top of connector J7, the screwheads may not be in contact with the circuitry. You must connect the switch to the proper terminals andthen screw it tightly.4. Connect power to the Indicator and turn on the indicator.5. Enter the I/O Menu, INPUT menu and set each function as listed in Table 3-3 one-by-one andtest each by pressing the external switch. Observe the Indicator input for proper functions. Ifthe indicator fails to respond to the input, replace the Main PC board. See section 4.3 forreplacement.