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Series 988

1/8 DIN Microprocessor-Based Temperature/Process Controller

Enhanced Software Features

Includes 986, 987, 988 and 989

Watlow Controls

1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580

Phone: (507) 454-5300, Fax: (507) 452-4507 http://www.watlow.com

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Содержание 988 Series

Страница 1: ...or Based Temperature Process Controller Enhanced Software Features Includes 986 987 988 and 989 Watlow Controls 1241 Bundy Boulevard P O Box 5580 Winona Minnesota USA 55987 5580 Phone 507 454 5300 Fax 507 452 4507 http www watlow com ...

Страница 2: ... can discuss your application with you Before calling please have the complete model number and user s manual available You can get technical support by dialing 507 494 5656 7 a m to 7 p m Central Standard Time or e mail to wintechsupport watlow com We Value Your Feedback Your comments and suggestions on this manual are welcome Please send them to Technical Writer Watlow Controls P O Box 5580 Wino...

Страница 3: ... as a heat transfer fluid This graph illustrates a system with a long lag time Curve A represents a single control system with PID parameters that allow a maximum heat up rate Too much energy is introduced and the set point is over shot In most long lag time systems the process value may never settle out to an acceptable error Curve C represents a single control system tuned to minimize overshoot ...

Страница 4: ...eratures of the heater Typically the range low term is set below the ambient temperature Otherwise the system could never fully cool down Setup When tuning a cascade system the inner loop must be tuned first In a heating system the inner loop is comprised of the output device and the input 2 sensor which usually measures the heater sheath temperature The output device controls a power switching de...

Страница 5: ...ired process set point and let the system stabilize Once the system stabilizes observe the value of Pr2 in the Display Menu If the Pr2 value fluctuates make the proportional band setting Pb1A wider until the Pr2 value stabilizes Make adjustment Pb1A in 5 to 10 increments allowing time between adjustments for the system to stabilize Once Pr2 has stabilized observe percent power in the display loop ...

Страница 6: ...um heater sheath temperature to 250 F The Series 988 is ordered with two thermocouple inputs Input 2 the inner loop in the cascade configuration measures the heater sheath Input 1 the outer loop measures the lube oil temperature before it leaves the tank The external set point is 125 By setting range high 2 rH2 to 250 the set point for the heater sheath will be limited thus extending the lube oil ...

Страница 7: ...ever the displayed set point indicates the desired difference between input 1 and input 2 The set point that input 1 will use is determined by the equation internal set point input 2 differential set point The lower display shows the differential set point which can be adjusted with the increment up arrow and decrement down arrow keys Please note that while in the differential control mode the int...

Страница 8: ...he system uses two type J thermocouples one to sense glass temperature input 1 and one to sense the ambient air tem perature input 2 To configure the controller first enable input 2 set to To enable the differential control algorithm set the control prompt in the Global Menu to differential Press the DISPLAY key The lower display will read 0 indicating no differential between input 1 and input 2 A...

Страница 9: ...250 then controlling at 750 operating a furnace with half a load versus a full load of steel changing the speed of a conveyor through a curing oven or using different materials in an extruder Series 988 controllers can be configured to switch between PID A and PID B based on a process value a set point value or the event input status At Pid2 PID 2 Crossover Selection Global Menu select what will c...

Страница 10: ...e temperatures The system characteristics are so very different that one set of PIDs will not give satis factory results under both normal and vacuum conditions The Series 988 solves this problem with the dual PID option Auto tuning PID A under normal atmospheric conditions then auto tuning PID B under vacuum conditions establishes PID values for two sets of system characteristics A pressure switc...

Страница 11: ...utput is required by the device that the 988 controls such as a three way valve that opens one way with a 12 to 20mA signal and opens the other way with a 4 to 12mA signal This feature reduces the overall system cost by using a single output to act as two outputs NOTE Duplex applications require a special valve Sample Application The system outlined above uses a three way valve for heating and coo...

Страница 12: ...e controlled part of the process Sample Application Blue pigment must be added to paint at a ratio of one part per 100 to cre ate a mixed paint of the desired color The uncolored paint flows into the mixer in an uncontrolled stream that is set manually and sensed by input 2 A motorized valve controls the flow of pigment which is monitored by the flow sensor to input 1 The flow rate of the uncolore...

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