SSI America 7SL instruction manual Control Output Function

Page 16

Control Output Function

Example of limit function when C1 = Hi and C2 = O

The relay output operates in fail-safe mode (relay de- energized during reset condition) and latching mode.

The control output turns OFF when the setpoint is ex- ceeded when C1 = Hi, or C1 = Lo. (When C1 = Hi.Lo control output turns off when the process is greater than “Su” or less than “S1”).

The control output remains OFF until the process is within setpoint and the acknowledge action has been performed (the sequence of action may or may not be important depending on parameter C2).

The upper display flashes when the setpoint is exceeded and returns to a steady display when the process is within

HS

 

(Setpoint

 

threshold

 

hysteresis)

 

ON

 

Relay OUT 1

 

OFF

 

ON

 

"Reset" LED

 

OFF

 

Flash

 

Upper display

FLASH

Steady

 

 

A

Su (Setpoint threshold)

FLASH

B C

setpoint.

When the control output is OFF the RESET LED is ON (if C2 = 0) or flashes (if C2 = 1).

When C2 = 1 the RESET LED is steady ON when control output is OFF and acknowledged.

A, B, C = Acknowledgment action by RESET button, digital input or serial link. NOTE: Acknowledgment B has no effect.

Example of limit function when C1 = Hi and C2 = 1

The reset 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 reset condition and max/min values detected are stored in memory and available for viewing until the next reset condition occurs. The information is lost at power down.

(Hysteresis)

ON

Relay OUT 1

OFF

ON "Reset" LED OFF

Flash Upper display Steady

FLASH

FLASH

A

Su (Setpoint threshold)

FLASH

FLASH

B

During a reset condition the values are continuously updated and can be monitored.

A, B = Acknowledgment action by RESET button, digital input or serial link.

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Contents
Model 7SL HIGH/LOW Limitrol 16 DIN, Four Digit HIGH/LOW Limitrol Congratulations Guide to simple set-upTable of Contents USE Wire Suitable For 75C MinimumMounting Requirements Dimensions and Panel Cutout Terminal Layout Wiring GuidelinesMeasuring Inputs TC Input Linear Input RTD InputRTD Logic Input7sl-1-00.p65 17/02, 239 PM Relay Outputs OUTSerial Interface CommonPower Supply Power Line and groundingPreliminary Hardware Settings Limitrol with RS-485 Limitrol without RS-485Configuration KEY Functions Configuration ProcedureR5 = Offset Adjustment R7 = Alarm Action on FaultC2 = Acknowledgment Mode R1 = Input Type and Range Value R2 = Decimal Point PositionControl Output Function C4 = Reset Memory C3 = Reset at Power-upP2 = Alarm configuration P3 = Alarm Action Alarm Standby Function= Safety Lock OFF =T1 = Timeout Selection tn10 = 10 second timeout Operating Mode Normal Display ModeIndicators ResetParameter Display Mode Key Functions in Normal Display ModeKey Functions in Parameter Display Mode Operating Parameters Error Messages Error MessagesError List Dealing with Error MessagesDefault Parameters Loading Default Operating ParametersDefault Operating Parameters List Loading Default Configuration ParametersDefault Configuration Parameter List ParaSpecifications Display Update Time Range Temperature DriftCommon Mode Rejection Ratio Normal Mode Rejection RatioAcknowledgment Mode Power-Up ModeAlarm Function Type of AlarmReferences CEI 70-1 IECNema ENV50140General Guidelines Calibration ProcedureCalibration Parameters Procedure TH TC Input Final Scale ValueTC Input Check Entering Calibration ValuesPH RTD Input Final Scale Value RTD CheckRJ. Cold Junction Compensation Check PL RTD Input Initial Scale ValueAH Current Input Final Scale Value Current Input CheckNH 5 Volt Input Final Scale Value Volt Input CheckUL 10 Volt Input Initial Scale Value UH 10 Volt Input Final Scale ValueMaintenance Manual Part No 7SL