Operating Instructions
Contents
1. Operating Instructions Temperature Controller type 201 APPLICABLE WHEN ALARM FEATURE IS IN USE cu O 7 LA jc mm O 7 CONTENTS section page Description Basic Operating Instructions Overtemperature Option Altering the Power Limit User Calibration Navigation Diagrams AMBWNR SWANN See also the main manual for the furnace oven or other product to which the controller is fitted MCO07 1 04 201 Controller 1 1 1 2 DESCRIPTION 201 Controller The model 201 controller is made especially for Carbolite by Eurotherm and shares many of the features of the Eurotherm 2000 range especially the model 2132 It is a digital instrument with PID control algorithms It is supplied as an integrated part of the control section of the oven or furnace The 201 features Easy use as a simple temperature controller where on setting the required temperature the controller immediately attempts to reach and maintain it A ramp to setpoint feature which may be used to limit the heating or cooling An alarm output which may be used in conjunction with a solid state relay for miscellaneous control purposes The controller does not contain a real time calendar and is not subject to century end date problems Model 201 Overtemperature Controller The 201 is optionally available as a dual unit containing the main controller and an overtemperature controller These two components share the same displa2. The overtemperature key must be held depressed continuously while viewing or adjusting the overtemperature controller If the Overtemperature key is released the display reverts to the main controller With the key pressed the overtemperature setpoint is normally displayed To alter the value use Down and Up To view the measured temperature press Scroll until PV process variable is displayed then press Down or Up Keep the overtemperature key depressed during these operations When an overtemperature condition is reached the overtemperature warning light changes from green to flashing red To accept or reset this alarm condition press the Overtemperature key and the Page key together the warning light changes to continuous red Once the over temperature condition is cleared by the temperature falling the light changes to green and normal operation resumes ALTERING THE POWER LIMIT Overview Depending on the furnace or oven model the power limit parameter OP Hi Output High may be accessible or hidden For silicon carbide heated furnaces the parameter is accessible to allow for compensation for element ageing see the appropriate section in the furnace manual In wire heated chamber or tube furnaces reducing the power limit is a convenient method of improving control at low temperatures as outlined below The power limit may be set to zero to permit demonstration of the controls without heating In many models the
3. as for main overtemperature controller sensor for factory access to lists and parameters not available to the operator MCO07 For preventive maintenance repair and calibration of all Furnace onl and Oven products please contact Thermal Engineering Services Telephone UK 0845 3308035 Int 44 1433 623335 E Fax UK 0845 3308036 Int 44 1433 623336 Ta Email thermalserve dial pipex com Engineering Services Carbolite Parsons Lane Hope Maw o m D a m y oa Y M a a n Hope Valley S33 6RB England Qm oy Taf 10 1 EEE i Telephone AIia 620011 Int 44 1433 620011 Facsimile 01433 621198 Int 44 1433 621198 MC07 1 04 1 3 01 201 E mail enquiry carbolite co uk
4. chieve a good result Avoid power limits below about 30 control accuracy falls off at such levels MCO07 5 201 Controller USER CALIBRATION The controller is calibrated for life at manufacture against known reference sources but there may be sensor errors or other system errors User calibration allows compensation for such errors and the 201 allows for a user 2 point calibration This setting is password protected to avoid accidental alteration Page to iP scroll to CAL P and use Up A to alter the password The password is 3 If the correct password is entered the display shows PASS Scroll to CAL and use V or A to observe the setting FACt factory values as manufactured or USEr user values Change to USEr NOTE before checking the calibration of the controller or of the complete system remember to reset the 201 to factory calibration values by setting the CAL P parameter to FACt To enter a user calibration scroll to each or the following parameters in turn and set the desired values Pnt L low temperature for which an offset is to be entered OFS L offset value for the low temperature Pnt H high temperature for which an offset is to be entered OFS H offset value for the high temperature Example the controller reads 3 C low at 400 C and 5 C low at 1000 C The parameter values should be Pnt L 400 OFS L 3 Pnt H 1000 OFS H 5 Negative or positive values can be entered if the controller is reading high negat
5. ed for 0 5 seconds 201 Controller 2 6 Stopping and Starting Control It is possible to stop and start the controller without altering the setpoint Press Scroll U until the legend m A manual auto appears In the 201 manual means off and auto means on Press Down V or Up A once to show the current on off state mAn for off and Auto for on Press VW or A to change between manual and auto off and on as required Altering the Ramp Rate It is possible to limit the rate of heating by setting a ramp rate Press Scroll O until the legend SPrr SetPoint ramp rate is displayed Use Down V or Up A to display and adjust the value The ramp rate sets the maximum rate of heating or cooling in degrees per minute A value of OFF cancels the ramp rate allowing heating and cooling at the maximum rate When this feature is in use there is a working setpoint which can be viewed at any time by scrolling to w SP and pressing V or A Fig 1 and fig 2 indicate the possible difference between running without and with a ramp to setpoint value depending on the load and the value used time time fig 1 control without ramp to setpoint fig 2 control with ramp to setpoint MCO7 4 2 4 3 201 Controller OVERTEMPERATURE OPTION This is only fitted when the overtemperature option is ordered To identify whether it is fitted observe the controller panel if it is fitted the overtemperature key and warning light are present
6. ive offsets would be appropriate Fig 4 gives a graphical representation of the 2 point calibration User calibration user temperature reading es E e lt gt Factory calibration Pnt L Pnt H factory temperature reading fig 4 2 point calibration 6 MC07 201 Controller NAVIGATION DIAGRAMS 6 1 Main Controller pee Home Input Output Access List List List i List O D B l 1 D 20 0 xc m iP IMSS oP ACCS C i g measured temperature g l J i g C use V A to access l i o setpoint i ppe E OP output power i OP Hi l codE read only i w SP present only if i power limit i SPrr in use setting if 4 present for factory access to m A manual Auto CAL FS es 3 lists and parameters mAn off Auto on not available to the if operator if user SPrr setpoint ramp rate calibration OFF or value tal Pnt L i user 2 point i i calibration i OFS L i Pnt H t OFS H i 6 2 Overtemperature Controller Hold the Overtemperature Key to make the parameters in this diagram available Home Input Access List List List D D 20 0 gt x IP ACCS g overtemperature g g C setpoint use V A to og alter PV measured calibration codE temperature at
7. ows or flashes as heating occurs The Page key L allows access to parameter lists within the controller most lists and parameters are hidden and cannot be accessed by the operator because they contain factory set parameters which should not be changed A single press of the page key L displays the temperature units normally set to C further presses reveal the lists indicated in the Navigation Diagram in section 6 The Scroll key O allows access to the parameters within a list Some parameters are display only others may be altered by the operator Some parameters only appear in appropriate circumstances for example working setpoint does not appear if setpoint ramp rate is Off A single press of the scroll key O displays the temperature units further presses reveal the parameters in the current list indicated in the Navigation Diagram To return to the Home list at any time press Page D and Scroll U together or wait for 45 seconds The Down V and Up A keys are used to alter the setpoint or other parameter values Basic Operation Normally no operator action is required other than entering the setpoint as the 201 starts to control on being switched on as described above Altering the Setpoint With the display at home showing the measured temperature press Down V or Up A once to display the setpoint press again or hold down to adjust it The display returns to the measured temperature when no key is press
8. power limit setting depends on the supply voltage usually the furnace or oven manual contains details if in doubt contact Carbolite for advice The power limit parameter does not apply to the overtemperature controller if present Altering the value Press Page D until oP output list is displayed Press Scroll U until OP Hi Output High is displayed Press Down V or Up A once to display the value of OP Hi and write down the value To alter the value use Down V or Up A Note that setting the value to zero prevents the furnace or oven from heating Caution Do not increase the power limit value to a value above the design level for the oven or furnace model or to a value above that correctly calculated for Silicon Carbide elements The heating elements could burn out or other damage could be caused Control at Low Temperatures If a product is to be used at temperatures much lower than its design maximum control stability can often be improved by reducing the power limit Remember to make a record of the original setting before altering the power limit Example It is desired to run a 1200 C furnace at 300 C The normal control settings can be expected to cause excessive overshoot as the furnace reaches temperature If the power limit OP Hi is normally set to 100 try a setting of 40 This should greatly reduce the overshoot There is no firm calculation rule to get this example setting of 40 experiment may be required to a
9. y and buttons but are otherwise independent The operational features in the overtemperature controller include Easy setting of the overtemperature limit setpoint A visible alarm on overtemperature condition A latching alarm output used to cut power to the heating elements this alarm output can also be used to power an optional audible alarm 2 key alarm acknowledgement MCO7 201 Controller BASIC OPERATING INSTRUCTIONS 2 1 2 2 when fitted 2 3 2 4 2 5 MC07 Furnace or Oven Controls Most Carbolite products are fitted with an Instrument Switch which cuts off power to the controller and other parts of the control circuit See the instruction manual for the furnace or oven for the overall operating instructions To operate the 201 there must be power to the furnace or oven and the Instrument switch must be on If a time switch is included in the furnace or oven circuit this must be in an On period The 201 Operation Pa z i 5 n Ht n Temperature 4 i Overtemperature O 0 x Output Light Note on the 201 display 1 F 1 i 1 i i 1 i i h ai the letters m and w look Oyertemperature like n and u In these g H9 Timer Light instructions the letters are described as m and w Scroll Down When switched on the controller lights up goes through a short test routine and then displays the measured temperature and starts to control The output light gl
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