SSI America 7SL Source Impedance, Input Impedance, Cold Junction, Control OUT, Power-Up Mode

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Source Impedance

100 Ω maximum for TC/mV input Less than 20 Ω per wire for RTD input

Input Impedance

Greater than 1 MΩ for TC/mV input Greater than 400 KΩ for 5V to 10V input range

Less than 5 Ω for mA input

Cold Junction

Automatic compensation from 0 to 50 °C Digital Input Input from dry contact (voltage free) to

restart process (optional)

Control OUT 1

Relay (form C) 3 Amp @ 250 Vac resistive load (with varistor on contacts)

(Relay operates in failsafe mode) Limit Type High limit (for heating process)

Low limit (for cooling process) High/Low limit (for special process)

Acknowledgment Mode

To restart the process, two conditions must apply

a)The process returns within setpoint

b)The operator has acknowledged the process (from keyboard, digital input or serial link)

The “a” and “b” sequence may or may not matter depending on C2 (see C2)

Power-Up Mode

Automatic or Manual restart. When in automatic restart the control output is guar- anteed OFF for 1 second.

Setpoint Threshold

Span limits

Threshold hysteresis

From 0.1 to 10.0% of span value or 1 LSD (whichever is greater)

OUT 2 Relay (form A) 2 Amp @ 250 Vac resistive load. OUT 2 is used as alarm output (optional)

Alarm Function

Process alarm

Deviation alarm

Band alarm

Type of Alarm

High/Low (Outside/Inside if band alarm)

Direct/Reverse

Automatic/Manual reset

Standby sequence/No standby sequence

Alarm Threshold

Span limits for process alarm

From 0 to 500 digits for band alarm

From -500 to 500 digits for deviation alarm

Alarm Hysteresis

From 0.1 to 10.0% of span value or 1 LSD (whichever is greater)

Serial Interface

RS-485 Opto-isolated (optional)

Protocol Type

 

Modbus/Jbus (RTU mode)

Device Address

 

From 1 to 255. NOTE: The interface can

 

support up to 31 devices

Baud Rate

600 up to 19200 baud

Format

1 start bit

 

8 bit with/without parity

 

1 stop bit

Parity

Even/Odd

Watch dog

Hw/Sw is provided for automatic restart

Protection

Internal dip switch for calibration and con-

 

figuration parameter protection.

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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