SSI America 7SL instruction manual Relay Outputs

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C.1) Relay Outputs

C.2) Inductive Loads

OUT 1 1

Class 1 2

NO - OUT 1

C - OUT 1

NC - OUT 1

High voltage transients may occur when switching induc- tive loads. Through internal contacts these transients may introduce disturbances which can affect the perfor- mance of the instrument. The same problem may occur when a switch is used in series with the internal contacts as shown below.

	3
OUT 2	6
Class 1
(Alarm)
	7

C

NO

C

R

LOAD

POWER

LINE

The cable used for relay output wiring must be as far away as possible from input or communication cables. Relay output: Protected by varistor.

OUT 1: Form C contact rating of 3 Amps/250 Vac resistive load.

OUT 2: Form A Contact rating of 2 Amps/250 Vac resistive load.

Number of operations: 2 x 105 at the specified rating.

NOTES:

1)To avoid shock and possible instrument damage, connect power last.

2)For power connections use 16 AWG or larger wires rated for 75 °C.

3)Use copper conductors only.

4)Do not run input wires with power cables.

For all the outputs, the internal protection (varistor) assures protection up to 0.5 Amp on inductive loads.

It is good electrical practice to install an additional RC net- work across and as close to the external contacts as possible.

The value of capacitor (C) and resistor (R) are shown in the following table.

Load	C	R	P	Resistor and
Current	(∝F)	(Ω )	(W)	Capacitor Voltage

< 40 mA	0.047	100	1/2	260 Vac

< 150 mA	0.1	22	2	260 Vac

< 0.5 Amp	0.33	47	2	260 Vac

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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 RTD Linear InputRTD Input 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 ProcedureC2 = Acknowledgment Mode R5 = Offset AdjustmentR7 = Alarm Action on Fault R1 = Input Type and Range Value R2 = Decimal Point PositionControl Output Function C4 = Reset Memory C3 = Reset at Power-upP2 = Alarm configuration = Safety Lock P3 = Alarm ActionAlarm Standby Function OFF =T1 = Timeout Selection tn10 = 10 second timeout Indicators Operating ModeNormal Display Mode ResetParameter Display Mode Key Functions in Normal Display ModeKey Functions in Parameter Display Mode Operating Parameters Error List Error MessagesError Messages Dealing with Error MessagesDefault Operating Parameters List Default ParametersLoading Default Operating Parameters Loading Default Configuration ParametersDefault Configuration Parameter List ParaSpecifications Common Mode Rejection Ratio Display Update Time RangeTemperature Drift Normal Mode Rejection RatioAlarm Function Acknowledgment ModePower-Up Mode Type of AlarmNema ReferencesCEI 70-1 IEC ENV50140General Guidelines Calibration ProcedureCalibration Parameters TC Input Check ProcedureTH TC Input Final Scale Value Entering Calibration ValuesRJ. Cold Junction Compensation Check PH RTD Input Final Scale ValueRTD Check PL RTD Input Initial Scale ValueNH 5 Volt Input Final Scale Value AH Current Input Final Scale ValueCurrent Input Check Volt Input CheckUL 10 Volt Input Initial Scale Value UH 10 Volt Input Final Scale ValueMaintenance Manual Part No 7SL