Chromalox 1604-7 user manual Inductive Loads, Linear Output, Load Operating Voltage

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INDUCTIVE LOADS

High voltage transients may occur switching inductive loads.

Through the internal contacts these transients may introduce disturbances which can affect the performance of the instrument.

For the OUT 2 and OUT 3, the internal protection (varistor) assures a correct protection up to 0.5 A of inductive component.

The same problem may occur when a switch is used in series with the internal contacts as shown in Fig. 9.

LINEAR OUTPUT

This instrument is equipped with one linear output (OUT 1) programmable as:

-main output (heating or cooling)

-secondary output (cooling)

-analog retransmission of the measured value

-analog retransmission of the operative set point.

			+			+
	6		+					mA


OUT 1			_
OUT 1								20
						_

		7

C

R

LOAD

POWER

LINE

Fig. 10 mA OUTPUT WIRING

Fig. 9 EXTERNAL SWITCH IN SERIES WITH THE INTERNAL CONTACT

In this case it is recommended to install an additional RC network across the external contact as show in Fig. 9

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

LOAD		C	R	P.	OPERATING
(mA)		(mF)	(W)	(W)	VOLTAGE

<40	mA	0.047	100	1/2	260 V AC
<150 mA		0.1	22	2	260 V AC
<0.5	A	0.33	47	2	260 V AC

The cable involved in relay output wiring must be as far away as possible from input or communica- tion cables.

6

It is an isolated analog output. Maximum load: 500 W.

1604-7-1-AB.p65

6

5/16/00, 10:50 AM

Image 9

Contents Chromalox Contents III Model identificationScrew Mounting RequirementsOutline and CUT-OUT Dimensions Outline and CUT OUT DimensionsMeasuring Inputs TC Input Connection DiagramsLinear Input RTD InputLogic Input Safety note Relay OutputsOUT Inductive Loads Linear OutputLoad Operating Voltage Serial Interface Power Line WiringWhen the Neutral line is present, connect it to terminal Input Preliminary Hardware SettingsType TC-RTD Open Input CircuitOFF SEr1 = Serial interface protocolSEr3 = Baude rate for serial link SEr4 = Byte format for serial linkP3 = Initial scale value P2 = Decimal point positionP4 = Full scale value P5 = Output 1 functionP7 = analog retransmission initial scale value P10 = Alarm 1 operating modeP8 = analog retransmission full scale value P9 = Output 2 function. nonE = output not usedP12 = Alarm 2 operating mode P14 = Alarm 2 threshold valueP15 = Alarm 2 hysteresis value P18 = Main control output action P19 = Displayed value of the main power outputP20 = Secondary control output action P22 = Cooling mediaP26 = Alarm 2 action P24 = Alarm 1 actionP28 = Offset adjustment added to the measured value P29 = Displayable protected parametersP36 = Timeout selection P38 = Output safety valueP34 = Manual function P41 = Control action type P43 = Set point indicationP44 = Operative set point alignment at instrument start up Indicators Display FunctionREM SP2 MAN SP SP2 Selection MAN =Direct Access to SET Point Manual FunctionLamp Test Serial Link Smart functionAL1 Alarm 1 threshold RSt Manual reset of the alarmsHSA1 Alarm 1 hysteresis AL2 Alarm 2 thresholdHysteresis for ON/OFF control action Output 3 cycle timeRelative Cooling gain Integral timeGrd1 Ramp applied to an increasing set point change TOL Time duration of the output power limiter soft startError Messages Error MessagesOverrange UnderrangeError List General Specifications General InformationsInputs Thermocouple Logic Input Linear InputsSET Points Control ActionsOutputs Output AlarmsMaintenance Serial Communication InterfaceStop bit one Address Parameter Default Value Appendix a Default Parameters= OFF HSA1, HSA2ER0 ParaP44 Appendix A.3 Appendix A.4 Emerson Electric CO Chromalox