operating instructions eex p control unit - Electromach BV

After the pre-purging phase,EEx digital valve does notswitch over to the small nozzle(only under § 5.1)The control device does notconnect the electrical devicesafter the pre-purging phaseAfter the purging time, thecontrol device switches off theelectrical devices after a timeA sufficient volume of protective gasis not flowing through the Ex-phousingThe nominal / required pressure ofthe reducing valve is not attainedDuring the pre-purging phase,housing is leaking on account ofexcessive internal pressure.Valve connection does not closeTemperature sensor is connected.Internal temperature is too highON/OFF switch / bridge is notconnected on terminals 19 and 20Pressure in the housing exceeds theswitching value of "MAX"Housing has a leak, pressureswitches "MIN A "and "MIN B" settoo lowIncrease the input pressure to thenominal / required valueProtective-gas supply too low.Increase the cross-sectional areaof the supply lineSeal the housing by takingappropriate measuresCheck that the supply voltage ofthe valve connection is switchedoffCheck that there are noextraneous particles in themechanical part of the valveconnectionWait until the internal temperaturehas dropped as a result of theincreased flow, or else check thesetting of the temperatureswitching valueTurn on the ON/OFF switch /connect bridge on terminals 19and 20Reduce the air flow of the leakageair nozzleSeal the housingPAGE 16/ 21