Kentec Electronics Sigma XT Plus Operation And Maintenance Manual

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Kentec Electronics Sigma XT Plus Operation And Maintenance Manual Manual pdf 30 page image

Man-1111_SigmaXT+_Coincidence_Unit_18 Page 30 of 3616.1 Watchdog resetIf the microprocessor on an ECU fails to carry out its operation correctly it will attempt to restart. The ECU willshow Fault and System Fault LEDs on the front panel, the buzzer will sound and the display will show CPUfaultThis fault can only be cleared by pressing the Watchdog Reset button.. The buzzer will continue to sound untilthe watchdog activation is reset.16.2 Processor resetIf the microprocessor on an Extinguishant module fails to run correctly it can be reset by pressing theProcessor Reset button on the PCB inside the control panel.This should not normally be necessary but should be done as a matter of course if the system is behavingabnormally. The system should resume normal operation within a couple of seconds of pressing the processorreset button.16.3 Terminate extinguishantOnce the extinguishant outputs have been operated they can not be switched off until after the reset inhibittimer has elapsed. For test purposes a terminate extinguishant button is provided which will terminateoperation of the extinguishant outputs and allow the system to be reset.16.4 Write enable switchIt is necessary to protect the configuration memory of extinguishant modules while the system is runningnormally. To do this a memory Write Enable switch is provided on each module. The memory Write Enableswitch must be switched on before any changes can be made to the configuration. The Write Enable switch isquite fragile and should be operated with care.16.5 Address switchExtinguishant modules are connected to the serial bus of the Sigma CP detection part of the control panel andeach module must be allocated an address between 1 and 7 using the binary coded DIP switch.The switch setting are shown in this tableInternal controls on extinguishant modulesADDRESS SWITCH POSITIONS1234567W/dog ResetReset Write EnableProc..Exting.Term. Address