Operating Instructions
Contents
1. Home Input Access List List List k 20 0 gt yc r iP ACCS g overtemperature g g C setpoint use V A to Onis alter PV measured calibration codE temperature at as for main overtemperature controller sensor for factory access to lists and parameters not available to the operator MCO1 11 Kebon P RODUC T Thank you for reading this data sheet For pricing or for further information please contact us at our UK Office using the details below UK Office Keison Products P O Box 2124 Chelmsford Essex CM1 3UP England Tel 44 0 1245 600560 Fax 44 0 1245 808399 Email sales keison co uk Please note Product designs and specifications are subject to change without notice The user is responsible for determining the suitability of this product2. Operating Instructions Temperature Controller type 201 cu O x ZA tc mm O x CONTENTS section page CONNNBWN Description Basic Operating Instructions Operation With the Timer Overtemperature Option Altering the Power Limit User Calibration Audible Alarm Navigation Diagrams O 00 0 NVU e jp See also the main manual for the furnace oven or other product to which the controller is fitted MCO1 1 06 201 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 A timer function which allows for heating for a predetermined time either from start or from reaching temperature or alternatively for delaying the start of heating An alarm output which may be used in conjunction with the timer for example to give an audible alarm at the end of the timing period The controller does not contain a real time calendar and is not subject to centu
3. At the end of the timing period control switches off i e goes into Manual to allow cooling and End flashes on the display On during the timing period Off from the end of the timing period mode 3 with SPrr active Dwell from working setpoint and switch off The timer starts timing when the working setpoint is within 1 C of the setpoint At the end of the timing period control switches off i e goes into Manual to allow cooling and End flashes on the display On during the timing period Off from the end of the timing period mode 4 with Sprr off Time from cold and stay on The timer starts timing immediately At the end of the timing period control remains on maintaining the setpoint temperature and End flashes on the display On during the timing period Off from the end of the timing period mode 4 with Sprr active Dwell from working setpoint and stay on The timer starts timing when the working setpoint is within 1 C of the setpoint At the end of the timing period control remains on maintaining the setpoint temperature and End flashes on the display On during the timing period Off from the end of the timing period mode 5 Delayed switch on The timer starts timing immediately and control starts at the end of the timing period There is no END condition in this mode On during the timing period Off from the end of the t
4. 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 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
5. To heat up at 10 C per minute to 500 C to hold at 500 C for 1 hour then to allow to cool down This uses set point ramp rate and timing mode 1 see the second line of the table on page 5 to create this program 1 Start with display at home use arrow keys to alter the setpoint to 500 2 Press scroll until sp rr shows use arrow key to set value to 10 3 Press scroll until tm op shows use arrow key to set value to opt 1 4 Press scroll until dwel shows use arrow key to set value to 60 to run this program MCO1 5 Press scroll until stat shows use arrow key to set value to run heating starts when run is set timing starts when the working setpoint reaches 499 C heating stops 60 minutes later 201 Controller 5 2 5 3 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 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
6. 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 achieve a good result Avoid power limits below about 30 control accuracy falls off at such levels USER CALIBRATION MCO1 201 Controller 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
7. etters 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 glows 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 8 The Scroll key U 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 t
8. he 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 pressed 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 Y or A to change between manual and auto off and on as required Note that timer modes 1 amp 3 set the controller to mAn at the end of the timing period If the controller unexpectedly does not control it may be in manual possibly as the result of previous use of the timer function 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 withou
9. 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 W 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 negative offsets would be appropriate Fig 4 gives a graphical representation of the 2 point calibration User calibration user temperature reading O La n T lt gt Factory calibration Pnt L PntH factory temperature reading fig 4 2 point calibration MCO1 9 201 Controller AUDIBLE ALARM If an audible alarm is supplied for use with the timer function then it is normally configured to sound at the EnD condition and to go off when the alarm i
10. iming period 3 1 MCO1 201 Controller 3 2 3 3 3 4 Setting the Timer Mode Scroll to tm OP use W or A to view and alter the mode The mode shows as OPt 1 to OPt 5 It is not possible to alter the mode while the timer is running if the mode cannot be altered scroll to the StAt parameter and set its value to OFF Setting the Time Period Method 1 Scroll to tmr time remaining Use V or A to view the remaining time the units are always in minutes Use V and A to set or alter the time Setting tmr automatically activates the timer the m A parameter changes to Auto and the StAt parameter changes to run Note that the tmr display shows 0 zero during the last minute of timing and also shows 0 when the time has expired The timer light indicates whether timing is still in progress Method 2 Scroll to dwEl and use and A to set the timing duration The advantage of method 2 is that dwEl need only be set once if repeated use of the same time period is required Scroll to StAt and use V or A to set the parameter value to run This copies the dwell time into tmr and activates the timer as in method 1 Running with the Timer Once the timer is activated by method 1 or 2 above the control sequence depends on the timer mode as previously given in the table Fig 3 gives another representation of the timer action working setpoint if setpoint ramp rate active f setpoint mperatur modes 2 4 am
11. p 5 temperature time ma gt lt gt reaching Timing lt gt temperature modes 1 amp 2 End modes I amp 2 continuing at temperature lt gt modes 2 amp 4 Timing or cooling down modes 3 amp 4 modes I amp 3 a with setpoint ramp rate Timing modes 3 amp 4 setpoint ramp rate off lt gt a a Timing reaching temperature and continuing at temperature mode 5 mode 5 fig 3 timer modes MCO1 201 Controller Stopping the Timer 3 5 3 6 3 7 To stop the timer at any time while it is running change the StAt parameter to OFF This is the same as reducing tmr to zero The controller then acts as though at has reached the end of the time period End of Time Period Modes 1 and 3 heating stops at the end of timing the m A parameter changes to mAn Modes 2 and 4 heating continues at the end of timing the m A parameter remains at Auto Mode 5 heating starts at the end of the timing period the m A parameter remains at Auto In modes 1 to 4 the alarm message EnD flashes on the display at the end of timing the StAt parameter remains at run In mode 5 there is no End message the StAt parameter changes to OFF at the end of timing Cancelling the Alarm To acknowledge cancel the EnD alarm press Page and Scroll together the StAt parameter changes to OFF Alternatively the alarm may be cancelled by directly changing the StAt parameter from run to OFF Program Example
12. ry 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 display 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 MCO1 201 Controller BASIC OPERATING INSTRUCTIONS 2 1 2 2 when fitted 2 3 2 4 2 5 MCO1 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 l
13. s acknowledged as given in section 3 6 If an audible alarm is supplied for use with the overtemperature condition then it is normally configured to sound on overtemperature and to go off when the alarm is acknowledged as given in section 4 It is not possible to cover in this manual other possible alarm features which may be included by customer special order 10 MCO1 201 Controller NAVIGATION DIAGRAMS 8 1 Main Controller I I Home Input Output Access List List List i List D D b l 1 20 0 xc iP m oP as cae ACCS g measured temperature l g i g C use V A to access i O J setpoint i Dom OR uo power CAL P i OP Hi codE read only i l enter l w SP present only if password power limit SPrr in use setting if 4 Pr esent for factory access to m A manual Auto CAL ai onder ES z lists and parameters mAn off Auto on not available to the if operator i if user SPrr setpoint ramp rate calibration OFF or value a a tm OP timer mode Pnt L as een pein J J calibration L tmr time remaining OFS L 4 7 dwel dwell time for Pnt H l timer l i TEE StAt timer status OFS H run or OFF szd 8 2 Overtemperature Controller Hold the Overtemperature Key to make the parameters in this diagram available
14. t 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 MCO1 201 Controller OPERATION WITH THE TIMER The 201 can be used as a process timer allowing timed heating or timed delay according to the options in the table There are 5 timer modes but 2 of them are affected by whether the setpoint ramp rate feature is being used making 7 entries in the table The table also shows the status of the Timer Light on the 201 A visual impression of the different modes is given in fig 3 remains on maintaining the setpoint temperature and End flashes on the display timer mode description timer light mode 1 The timer starts timing when the actual On while temperature is Timed dwell and temperature is within 1 C of the setpoint reaching setpoint switch off At the end of the timing period control On during the timing period switches off i e goes into Manual to Off from the end of the allow cooling and EnD flashes on the timing period display mode 2 The timer starts timing when the actual On while temperature is Timed dwell and temperature is within 1 C of the setpoint reaching setpoint stay on At the end of the timing period control On during the timing period Off from the end of the timing period mode 3 with SPrr off Time from cold and switch off The timer starts timing immediately
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