Omega Vehicle Security CN3271 Series manual Limiter function

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Limiter function

The relay of the output 1 operates in fail-safe mode (relay de-energized during shutdown condition) and latching mode.

The OUT 1 turns OFF when:

-The instrument is configured as a high limiter

(C1 = Hi) and the measured value is greater than limiter threshold [“Su” parameter (see Operative parameters”)] or

-The instrument is configured as a low limiter (C1 = LO) and the measured value is less than limiter threshold [“Su” parameter (see Operative parameters”)] or

-The instrument is configured as a high/low

limiter (C1 = HiLO) and the measured value is greater than “Su” parameter (see Operative parameters”) or less than “S1” parameter (see Operative parameters”).

The Out 1 remains OFF until the condition which generated the shutdown, no longer exists and the acknowledge action has been performed.

The upper display flashes during a shutdown and returns to a steady display when the shutdown condition no longer exists.

When the OUT 1 is OFF the RESET LED is ON [if the selected rearming mode is equal to 0 (C2 = 0)] or flashes [if the selected rearming mode is equal to 1 (C2 = 1)]. When the selected rearming mode is equal to 1

(C2 = 1) the RESET LED is steady ON when OUT 1 is OFF and acknowledged.

The shutdown condition can be stored in permanent memory (see C4).

Acknowledgment can be performed by pressing the RESET key, by momentarily closing the external dry contact or by a command from the serial link.

The length of the shutdown condition and max/min measured values are stored in memory and available for viewing (see “Normal Display Mode”) until the next shutdown condition occurs.

These informations are lost at power down.

During a shutdown condition the max/min measured values are continuously updated and can be monitored.

Example 1 - C1 = Hi and C2 = O

Example 2 - C1 = Hi and C2 = 1

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Contents CN3271-add2.pmd 19/08/2004 OMEGAnet On-LineService Internet e-mail Info@omega.com Contents Mounting Requirements Screw Bracket PanelWithout RS-485 With RS-485 Dimensions and Rear Terminal BlocksPanel Cutout Wiring Guidelines RTD Input Linear Input MA, mV and V Inputs WiringRelay Outputs Logic Input for models with RS-485 onlyOUT 1 Class Use cupper conductors onlySerial Interface Inductive LoadsAA/A Power Line and grounding100 to 240 Vac 500 mA 250 100/240 V AC 125 mAHigh Low Limiter without RS-485 High Low Limiter with RS-485Configuration KEY Functions Configuration ProcedureSerial Interface Protocol R7 = Alarm action on input fault R5 = Offset AdjustmentType Value R2 = Decimal Point PositionHi.Lo = High and low limit for special process C2 = Rearming ModeConstant Alarm Function = Rearm at Power-up Auto = Automatic rearm= Alarm configuration = Shutdown memoryP3 = Alarm Action Example for P2 = H.A.A.cExample for P2 = H.L Alarm Standby mask Function = Safety LockT1 = Timeout Selection Normal Display Mode Operating ModeFlashes when alarm is on IndicatorsNormal Display Mode to Operative Parameter Display Mode Operative Parameter Display ModeOperating Parameters Example 1 C1 = Hi and C2 = O Example 2 C1 = Hi and C2 = Limiter functionAlarm functions Serial LInk optionalDevice can be connected to a host computer via serial link Error Messages Error MessagesError List Dealing with Error MessagesPower consumption 8 VA General SpecificationsCommon mode rejection ratio Temperature Drift CJ excludedLinear Inputs Inputs ThermocoupleLogic Inputs AlarmOutputs OutputSerial Communication Interface Option MaintenanceDefault Operating Parameters List Default ParametersLHL-A-NEUTRO.pmd 19/04/2004 Second Seconds Appendix A.3 Appendix B Thermocouple Compensating Cable Color Codes Return Requests / Inquiries Data Acquisition
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