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ST314A

1. Page 6 ST314A User Handbook Program Pause Facility While firing press and hold down the key for about 4 seconds The ST314A will pause the executing program To un pause the program press and hold down the key again for about 4 seconds The effects of pausing are as follows If paused during ramping the kiln temperature will be held soaked in definitely at the current kiln temperature The ramp will continue when un pause is selected If paused during soaking then the soak time will be extended indefinitely The remainder of the soak period will be resumed when un pause is se lected Segment advance key held down for about 4 seconds can also be used to terminate the pause This will advance the segment and will immedi ately terminate a paused soak advancing to the next segment if any Changes made to the operation of the ST314A in this way are temporary and are not stored As a warning during pause a double beep is sounded every 10 seconds the display scrolls PAUSEd for 5 seconds then shows the kiln tem perature for 5 seconds c O Chr O hr min WARNING PROGRAM PAUSE Adjusting While Firing The program pause facility should be used with care Program execution is suspended and the kiln will be held at its current temperature indefinitely If left too long at high temperatures kiln damage could result ST314A User Handbook Page 15 Adjusting While Firing Firing values can be adjusted whi
2. display will flash A further push of the key increments the segment display digit and firing data for the next segment can be entered Page 7 O c Data entry is terminated if End is selected for a ramp rate with the key Data entry is also Cihr automatically terminated if 9 segments have been O hr min entered Note available ramp rate displays are End 999 amp FULL If End is shown but another segment is required then push the key to obtain the required ramp rate in the range 1 C hr to 999 C hr If full power is required then push the t key until FULL is diplayed Note to exit programming without cycling through all of the above steps wait 10 seconds without pressing any keys the ST314A will revert to the idle display Alternatively press the START STOP key to exit programming and to begin firing immediately Note the key can be used to reverse through the programming steps to correct errors or to exit programming mode Programming Page 8 ST314A User Handbook Cooling Upon completion of firing the ST314A lights all lamps on the mimic display and the kiln is allowed to cool naturally c O Chr O Chhr O hr min O hr min While the kiln temperature is above 40 C the display alternates every 5 seconds between the kiln temperature and Hot c O Chhr O Chhr O hr min O hr min When the kiln has cooled to less than 40 C the display alternates every 5 seconds between the kiln tem
3. Enamel is also suitable for some enamelling work Heavy Sculpture is also suitable for Terracotta ST314A User Handbook Page 19 Other Features Other Features Energy Used Display Pressing the button at any time shows the amount of electrical energy used in kW hours If pressed during a firing it shows the energy used so far After a firing it shows the total energy used for that firing This information is stored while power is off and is only reset to zero when a new firing is started If the value displayed is always 0 0 then the kiln power rating has not been configured into the ST314A see installation handbook Keyboard Lock Facility The keys on the ST314A can be locked so that pressing them has no effect This is an anti tamper feature used to ensure that the operation of the ST314A or the program data cannot be altered by un authorised people The ST314A can be locked when it is idle not firing or while it is firing It cannot be locked while it is being programmed O C If the left hand decimal point in the dis O cihr play is lit then the ST314A is locked Press and hold in both the amp keys O hr min for 5 seconds to unlock the ST314A O C If the left hand decimal point in the dis O Chr play is not lit then the ST314A is not locked Press and hold in both the t amp O hr min keys for 5 seconds to lock the ST314A Power Failure Recovery If power fails during firing then the ST314A rec
4. be what is desired so the STOP key should only be used to halt the firing in an emergency The program can be paused or program data can be changed while the controller is firing see page 14 This is a better option than using the STOP key The segment advance feature see page 14 is however avail able to recover quickly from STOP key operation if required Memo All programs amp necessary data are remembered when the ST314A is turned off In the event of power failure during firing the ST314 will automatically resume firing when power is returned this feature can be disabled see in stallation handbook Delayed Start The delayed start time period is set to 02 00 when the ST314A is turned on Page 12 ST314A User Handbook Firing To start a firing press the START STOP key The RUN lamp will light To stop the firing prematurely press the START STOP key again Hint it is good practice to check that the program is correct by pressing e the key amp checking the program contents before pressing the START STOP key to start a firing iring F c If the left hand decimal point is on then O cihr the keyboard is locked amp the ST314A will not respond to the START STOP O hr min key Press the amp keys together amp hold down for 5 seconds to unlock O C If a delayed start has been set then pressing the START STOP key causes a time delay O Cihr tostart The time remaining is shown on hr min th
5. mimic panel lamps are on then vc the ST314A is firing Press the O Clhr START STOP key to stop the firing O hrmin During firing the right hand decimal point will light to show when the kiln is heating ST314A User Handbook Page 5 Programming Programming A firing segment cooling ramp t va C Cooling soak temperature Heating soak period Delay o heating ramp An ST314A firing segment comprises a ramp followed by a soak period Two segments can be used for simple firing biscuit firing for example or up to 9 segments can be used per program for complex firing crystal glaz ing or glass making for example The ST314A ramps the kiln temperature at the required ramp rate until the kiln reaches the soak temperature It then soaks dwells at the soak tem perature for the soak time It then runs the next segment until the end of the program is reached The ST314A is capable of both positive heating ramps and negative cooling ramps as used in glassmaking for annealing The type of ramp is clearly shown on the mimic display during firing The ramp rate is settable in the range 1 C hour to 999 C hour or FULL full power or End end of program The soak temperature is settable over the range 0 to 1320 C The soak time is settable over the range 00 00 no soak to 99 hours 59 mins Note during soaking the ST314A display alternates every 5 seconds between kiln temperature and soak time remaining
6. Further copies of this handbook may be found at www staffordinstruments co uk docs st3 14a user3 14a pdf Page 20 ST314A User Handbook TAEEOR ST314A User Handbook SEGMENT STAFFOR Temperature Programmer ST314A Temperature Programmer Stafford Instruments Ltd www staffordinstruments co uk C Tel 44 0 1785 255588 email support stafford inst co uk Fax 44 0 1785 255589 See separate handbook for User Instructions Issue 2 00 Copyright 2009 Stafford Instruments Ltd Date 01 June 2009 At A Glance DISPLAY MAIN DISPLAY INDICATORS FIRING LAMP CONTROL KEYS 5 SEGMENT MIMIC DISPLAY SEGMENT Q R T lt COOLING RAMP LAMP SOAK TIME LAMP Com C Cooling Soaking Heating Delay is SOAK TEMPERATURE LAMP DELAYED HEATING START LAMP RAMP LAMP Page 2 ST314A User Handbook Sample Programs Name Ramp 1 ti Soak temp Soak time Low Biscuit Normal Biscuit High Biscuit Earthenware Low Temperature Glaze Earthenware Mid Temperature Glaze Earthenware High Temperature Glaze Stoneware Glaze On Glaze Enamel Heavy Sculpture Notes 70 C hr 600 C 960 C 00 15 1000 C 1160 C 960 C 70 C hr 70 C hr 90 C hr 90 C hr 70 C hr 90 C hr 90 C hr 90 C hr Sample Programs 50 C hr 90 C hr Earthenware High Temperature Glaze is also suitable for Stoneware Low Temperature Glaze Stoneware Glaze is also suitable for Porcelain On Glaze
7. e display this counts down once per minute The DELAYED START lamp on the mimic panel will light The centre decimal point will flash once per second O C If no delayed start has been set 00 00 then pressing the START STOP key O Cihr causes firing to commence immediately O hr min Either the HEATING RAMP or COOL ING RAMP lamp on the mimic panel will light If kiln heating is required then the right hand decimal point on the display will light while heating power is being applied to the kiln Information The ST314A operates by calculating the amount of energy required by the kiln every 30 seconds If for example 40 of full energy is required to maintain a particular ramp rate or a particular soak temperature then the ST314A will apply heating power to the kiln for 12 seconds every 30 seconds The right hand decimal point in the display will light for 12 seconds every 30 seconds If the kiln has a contactor then a loud click will be heard both when the decimal point lights up and when it goes out If full heating power is required then the decimal point will remain lit If full cooling is required then the decimal point will remain off ST314A User Handbook Page 9 Please photocopy me Program Record Sheet Segment Soak Time Page 10 ST314A User Handbook ST314A User Handbook Page 11 Please photocopy me
8. ermocouple connection intermittent or high resistance O c O Chr O hr min O c O Chr O hr min Page 16 Error 5 Kiln temperature overshoot The kiln temperature exceeds the desired temperature by at least 10 C 20 C installer selectable Error 6 Maximum firing time exceeded The length of the current firing has exceeded an installer selectable 10 999 hours limit ST314A User Handbook Turning On When turned on the ST314A performs a display test by briefly illuminating all of the display digits and all of the front panel lamps The version number of the software embedded within the ST314A is now displayed If you ever need technical support you will be asked for this code together with the ST314A s serial number Next displayed is the thermocouple type to which the ST314A is set This thermocouple type setting should match the type of thermocouple fitted to the kiln and can be R S K or N type R type type Q thermo thermo ON couple couple E K type N type Sum thermo thermo couple couple c The final display should show the O cihr kiln temperature 20 C shown here j with the C indicator on All O nhr min other lamps should be off C If the left hand decimal point is on then the keyboard is locked This is O Cihr an anti tamper feature Press the O hr min amp keys together amp hold down for 5 seconds to unlock If any
9. le the ST314A is firing Also there are program pause un pause and segment advance features that are particulary useful for glass work Adjusting Firing Values While firing operate the key to select the required parameter as shown by a flashing lamp on the mimic display The firing value is shown on the main display and can now be adjusted with the amp keys in the usual way The contents of the current segment or any segment still to be executed can be changed Firing will still carry on as normal while these changes are being made The ST314A will return to its normal running display 10 seconds after key presses cease or immediately after End is displayed Changes made to programs in this way are stored and are used for subsequent firings Segment Advance Facility While firing press and hold down the key for about 4 seconds The ST314A will sound a short beep and the executing program will immedi ately advance one step as indicated by lamps on the mimic panel The effect of this is as follows If a start delay is currently executing then the ST314A will terminate this and start firing immediately If ramping is currently executing then the ST314A will switch to soak at the current kiln temperature Adjusting While Firing If currently soaking then the ST314A will advance to the next segment if any or else it will end the firing Changes made to the operation of the ST314A in this way are temporary and are not sto
10. overs as follows For power failure during start delay the ST314A commences firing immedi ately when power returns For power failure during ramping the ST314A continues the ramp it was previously executing For power failure during soaking the ST314A ramps back up to soak temperature at the correct ramp rate then applies the remaining soak period This recovery scheme can be disabled if required see installation handbook the ST314A will then lock up with FA L displayed and kiln off in the event of power failure Page 18 ST314A User Handbook Quick Start Guide Switch on amp wait for kiln temperature display To run a firing program set up previously press the START STOP key To stop the firing at any time press the START STOP key again To review firing data press the key to enter the programming menu To change firing data press the amp keys to change the displayed value Use the key again as necessary to index to the next firing value or segment to be reviewed or changed To mark the end of a program set a ramp rate to End with the key To exit the programming menu either wait 10 sec onds or press the START STOP key to start firing If the keyboard is locked then press the amp keys together amp hold down for 5 seconds to unlock ST314A User Handbook Page 3 Quick Start Guide Contents Features Contents At A AAG csteicsneisesiesicesnisesinesiebsteseesinsiesensslennde 2 Quick S
11. perature and End O c O c Cooling To return the ST314A back to idle condition ready for the next firing press the START STOP key or turn off the power to the instrument ST314A User Handbook Page 13 iring F Operating Notes Kiln too slow If the ST314A is programmed to heat the kiln at a faster rate than the kiln is capable of then the ST314A will turn on full power then wait until the kiln temperature has risen to the correct temperature before proceeding to the next ramp or soak segment Likewise if the ST314A is programmed to cool the kiln at a faster rate than the kiln is capable of then the ST314A will apply zero power then wait until the kiln has cooled to the correct temperature before proceeding to the next ramp or soak segment Heating amp Cooling Ramps The ST314A is capable of controlled ramps for both heating and cooling The type of ramp required is determined by comparing the required soak temperature to the soak temperature in the previous segment and is shown on the mimic display STOP key operation If the START STOP key is pressed during a firing then the firing will be halted not paused Pressing the START STOP key again will cause the ST314A to restart the firing from the beginning The ST314A will look at the current kiln temperature and if this is greater than required soak tem perature then the ST314A will automatically coo from current tempera ture to the soak temperature This may not
12. red Page 14 ST314A User Handbook Altering a program When the ST314A is not firing there are no lamps lit on the mimic panel the run lamp is off and the display shows the kiln temperature with the C indicator lit c O Chhr O hr min The controller settings can be reviewed by pressing the key Note holding down the or keys causes rapid change of the displayed value O c O Clhr hr min O c Chhr O hr min c O Clhr O hr min O c O Clhr hr min SEGMENT ST314A User Handbook If the left hand decimal point is on then the keyboard is locked Press the amp keys together amp hold down for 5 seconds to unlock Programming The first push of the key displays the start delay time in the range 00 00 to 99 59 99 hours 59 mins This can be altered with the amp keys The DELAYED START lamp on the mimic display will flash then displays the ramp rate in the range 1 to 999 C hr or FULL or End This can be altered with the amp keys The HEATING RAMP or COOLING RAMP lamp on the mimic display will flash then displays the soak temperature in the range 0 to 1320 C This can be altered with the amp keys The SOAK TEMPERATURE lamp on the mimic display will flash The next push of the key displays the soak time in the range 00 00 to 99 59 99 hours 59 mins This can be altered with the amp keys The SOAK TIME lamp on the mimic
13. strument and have the fault investigated by your installer or kiln service engineer to rectify the Note these error messages are provided to detect kiln faults and so offer some protection to the kiln For increased protection the use of a heat fuse or other independent over temperature trip is recommended such as the Stafford Instruments ST121 Technical note any error message will cause the auxiliary alarm relay if fitted to open see installation handbook for details ST314A User Handbook Page 17 Error Messages O c O Clhr O hr min Error 1 The kiln temperature is not increasing as required The kiln has been on full power for 1 hour but the kiln temperature has not risen by at least 8 C Possible causes are kiln door or lid not closed properly heater element failure elements too old power phase failure contactor failure or thermocouple short circuit O c O Clhr O hr min O c O Clhr O hr min O c O Clhr O hr min Error Messages Error 2 Thermocouple or thermocouple wiring open circuit Get thermocouple and wiring checked Have thermocouple replaced if necessary Error 3 Thermocouple reversed kiln temperature apparently less than 40 C This is an installation fault Get wiring checked Error 4 Kiln temperature too high The kiln has been on zero power for 30 minutes but the kiln temperature has not fallen by at least 1 C Possible causes are contactor failure or th
14. tart Guide ccccccccccccceesessssseseeeees 3 COMGUIG isdsnapecnadadserietinnsnicasctentiviaasecestiecee 4 FESTUTE S i cresu ee 4 Turning Oferosrenioreorerir snte 5 Programming coon ieccanes to ed lenewaswinivebasbersanaines 6 FINE scaceotdaseintpalsadea E 9 OMI oreren enaere aes ak 13 Adjusting While Firing ce eeeeeeeeees 14 Error Witssq Ges sc uaccsasaneieaucaneueatoanceies 16 Other Features scriitori 18 Sample PLO CCAMIS sesicssnsinsthicesncdiamriacieeanteunss 19 Features e Single program with up to 9 segments e 1 controlled heating cooling ramp soak per segment e Soak times up to 99 hours 59 mins e Ramp rates from to 999 C hour full e Ideal for glass or ceramics use e Program can be altered while firing e Program pause un pause segment advance facilities e Keyboard lockable e Delayed start facility up to 99 hours 59 mins e Power failure recovery e Energy used display e Alarm buzzer amp alarm output Page 4 ST314A User Handbook O C Error 7 Maximum room temperature O cihr exceeded The internal temperature of the ST314A has exceeded an installer O hrmin selectable 30 70 C limit Possible causes are room vent fan failure ventilation grills blocked kiln room too small damper or bung left open These error messages cause the ST314A to terminate the firing with all the keys locked An alarm buzzer sounds once per second SWITCH KILN OFF To reset the ST314A turn off the power to the in

ST314A

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