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Manafacture: Omega File size: 198.03 kb File name: M3229.pdf Language of manual:

Debouncing for 200 mS time constant is normally incorporated on the three control inputs, but may be disabled by removing internal jumpers. Vexc is the Excitation Voltage for sensors supplied by the instrument (pins 1, 2 & 9). The connections to Serial A, Serial B and GND are for the RS422 data output. Run time uncertainty The control inputs are sensed eight times per second, but the actual run time clock is incremented or decremented in synchronism with the built in real time clock once per second. This means that each start/stop condition may be inaccurate by up to one second. Page : 8 8.5.- EXCITATION VOLTAGE FOR SENSORS The unit supplies the Excitation Voltage for sensors, through control lines connector. If the current required for the sensors installed is more than 100 mA then do not use this terminal. Install other external power supply. See paragraph 5 for technical specifications 9.- POWER-UP AND OPERATION 9.1.- REAL TIME CLOCK At power-up, the unit displays the message MAStEr for 6 decade version or MASt for 4 decade version and will start to operate. If a failure occurs then will display the messages CHIP or SET. The message CHIP means that the failure is the internal hardware and the message SET means that the data stored in the memory is damaged and it must be restored. The restore data operation can be made while the instrument is in normal operation or while the error message SET is on the display using the control lines HOURS, MINUTES & SECONDS. Reaction to the control lines is once per second. To obtain a complete reset in a real time clock configuration, connect terminals 14 & 13 to GND simultaneously. The display can be switched in to Run Time Clock mode by inputting an active signal on to any of the three control lines START, STOP or RESET. Terminal Function 14 Hours Increment hours 6 Minutes Increment minutes 13 Seconds Reset seconds 9.2.- RUN TIME CLOCK At power-up, the unit displays the message MAStEr for 6 decade version or MASt for 4 decade version and will start to operate. If a failure occurs then will display the messages CHIP or SET. The message CHIP means that the failure is the internal hardware and the message SETmeans that the alarm value stored in the memory is damaged and it must be restored. Use the control lines RESET, START & STOP to control the timer. Once the unit is displaying the run time clock the three control lines operate as show in the table. An active signal can be either active high or active low depending upon the internal configuration of the unit as shown in paragraph 10.2.4. The factory default settings are for contact closures to GND for all three inputs. Reaction to the control lines is once per second. Note on the 4 decade clock the run time clock may be either for hours and minutes or for minutes and seconds. During run time hours and minutes, the colon will flash on and off every second while the clock is running to indicate the clock is running. An active signal applied to pin : Function 11 Reset 3 Start 10 Stop Resets/Preset the timerStarts the timer Stops the timer running Starts the timer if not running 9.2.1.- UP / DOWN TIMING The run time clock has two basic modes of operation; a run up clock or a run down clock. These modes are controlled by a internal DIP switch (See DIP SWITCH CONFIGURATION in paragraph 10.2.3). Run up clock Reset will clear the clock to zero. When the alarm point is reached, if the alarm is enabled, the clock will stop and the whole display will flash and the alarm output will be activated, until the clock is reset. If the alarm is disabled, the clock will run up to 99 minutes 59 seconds (or 99 hours 59 minutes) and then roll over zero. Run down clock Reset will preset the clock to the alarm point. When zero is reached, if the alarm is enabled, the clock will stop and the whole display will flash and the alarm output will be activated, until the clock is reset. If the alarm is disabled, the clock will run down to zero and then underflow to 99 : 59. Page : 9 9.2.2.- CONNECTION EXAMPLES Different interlinking of the three control lines will produce different operating modes: Stop Start Reset GND Stop Start Reset GND Stop Start Reset GND A A Stop Push B = start A Push A = stop Start B Push C = reset C Reset note A may close while B is shut GND B may open while A is shut A B B Push A = stop Push B = reset Close contact A = reset and run Open contact A = stop With contact B opened close contact A = run open contact A = stop push contact B = reset Push A = start Stop Start Reset GND B Push A = reset and start A Push B = stop (push B again = start) 9.3.- RUN TIME ALARM SETTING The alarm is a 4 decade alarm only. On the 6 decade clock, the alarm setting is for hours and minutes only and on the 4 decade clock the alarm point can be for either hours and minutes or minutes and seconds. Displaying or setting of the alarm point can only be done when the unit is displaying the run time and is not running. The same three contact inputs ar...

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