Redcliff Microsystems GCU 15 User Manual
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GCU 15/25/100 –User guide 4/111 IntroductionThis range of Switching Units has been designed to provide two independentaccurately timed switched outputs with two corresponding synchronisation inputs.The main output provides for a non-isolated MOSFET transistor device capable ofswitching a maximum current of 15, 25 & 100 amps at 60, 60 & 100 voltsrespectively whilst the secondary output provides a non-isolated current drive of 3milliamps from an unloaded voltage source of 6 volts. The main output is providedvia a pair of heavy duty contacts situated in the lid of the box. The second output isavailable via the lower pair of Red & White 2mm socket connectors.There are two inputs provided for synchronisation purposes with the first inputrequiring a voltage source of 3 - 5 volts, whilst the second input is isolated through anOptocoupler device and requires a current source of between 0.5 - 5 milliamps. Thefirst Input is defined as the INDIRECT SYNCHRONISATION INPUT and isavailable via the top pair of Blue 2mm socket connectors. The second is defined as theDIRECT SYNCHRONISATION INPUT and is available via the middle pair of Red& Blue 2mm sockets with the Black socket internally connected to the negative sideof the battery which is also common with the MOSFET Output Black terminal.Accurate timing control of the two outputs is ensured through the use of a precisioncrystal oscillator with microprocessor software controlled temperature compensation.The unit is powered from an included Nickel Metal Hydride 6 volt battery supportedby an on-board battery charger which requires an external source of 9 - 12 volts forcharging at a nominal current of 30 milliamps.Manual operation of the unit is provided via a 5 station Keypad, providing ‘ENTER’,‘SCROLL UP/DOWN’, and ‘INCREMENT/DECREMENT’facilities.The unit is also provided with an LCD display for 2 lines of 16 characters. In order toconserve battery power the LCD display unit is automatically powered off when theunit is not being actively addressed (i.e. the unit is powered off after a quiet period of5 minutes without any key depressions from the user). The display unit is relativelyheavy in power demand due to the extended operational temperature range hence theneed to conserve power when not required. This Option is selectable by the user butthe choice selected is stored as a user requirement.Chapter1 |
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