User guide

18of34 MN300282 RevA
CONFIGURATION(cont.) StepFive
HowtosetRelayFail‐Safe/LOST:Intheeventthesensordoesnotreceiveanecho,theFail‐SafeOutputor
LOST setting can be set to turn  each relay ON, OFF or HOLD (to last state) to achieve the desired fail‐safe
condition.Duringfail‐safe,thedisplaywillreadLOST.
1. InTOP‐LEVELMENUmode,selectSAFE.
2. SelectR1(Relay1),R2(Relay2)orR2(Relay3).
3. SelectON,OFF,orHOLD.
4. SelectEXITtoreturntoTOP‐LEVELMENU.
Power Outage:If power to the EchoSwitch® is
removed (intentionally or accidentally), the relays
willreturntothenormalstate.Thus,inRelay1,NC
terminalwillbeclosedandNOterminalwillbeopen.
Also,the NO terminalsin relays2 and 3will also be
open.Make sure that the de‐energized state is the
safe state in your system design.The EchoSwitch®
doesusenon‐volatilememorysoanypowerlosswill
notaffectthesettingsorconfigurationofthesensor.
HowtoselectFail‐SafeCurrentOutput/LOST:Intheeventthesensordoesnotreceiveanecho,theFail‐Safe
Current Output or LOST setting  can be set to output a current of 4mA, 21mA or Hold (last known value).
Duringfail‐safe,thedisplaywillreadLOST.
1. InTOP‐LEVELMENUmode,selectSAFE.
2. SelectOUTPUT.
3. Select4mA,21mA,orHOLD.
4. SelectEXITtoreturntoTOP‐LEVELMENU.
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