Stafford user guide ST222
Contents
1. Firing values can be adjusted during a firing Also there are program pause and pro gram advance features that are particulary useful for glass work Adjusting Firing Values While firing operate the STEP key to select the firing parameter that needs to be changed Note that the program number cannot be changed while firing Also only the current segment or segments not yet fired can be changed while firing Firing will still carry on as normal while these changes are being made The controller 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 gt gt Program Advance Facility While firing press and hold down the UP key for about 4 seconds until the controller beeps The executing program will immediately advance one step as follows If a start delay is currently executing then the controller will terminate this and start firing immediately If ramping is currently executing then the controller will switch to soak at the current kiln temperature If currently soaking then the controller will advance to the next segment if any or else it will end the firing Changes made to the operation of the controller in this way are temporary and are not stored Page 8 ST222 Handbook Firing Press the START key The display will show 00 00 The RUN INDICATOR and the TIME INDICATOR will2. is pressed ST222 Handbook Page 5 RAMP RATE INDICATOR At a G l a n ce Lights when main display is showing a ramp rate in C hour HEATING INDICATOR Lights when firing a heating ramp MAIN DISPLAY TENPERATURA Pen Lights when main display is showing temperature in C COOLING INDICATOR TIME INDICATOR Lights when firing a cooling ramp Lights when main display is showing time remaining hours mins SEGMENT DISPLAY SEGMENT Shows segment number 1 to 9 Each segment comprises a ramp KILN ON INDICATOR followed by an optional soak Lights when power applied to kil iii RUN INDICATOR Indicates firing or delayed start iiki k is active THERMOCOUPLE SOCKET gt 7 Pe Connect thermocouple here T7 DA LEA A TF START STOP KEY m Used to start stop a firing program gt ii or to initiate a delayed start ry fy KILN POWER SOCKET 91222 Plug kiln in here p P TE Used to step through a program Press amp hold down both UP amp DOWN keys to display so the program values can be energy used reviewed or altered DOWN KEY Used in conjunction with STEP KEY to reduce a displayed program value Press amp hold down for 5 secs while firing to PAUSE program UP KEY Used in conjunction with STEP KEY to increase a displayed program value Press amp hold down for 5 secs while firing to ADVANCE program Page 6 ST222 Handbook ST222 Handbook Page 7
3. Notices TAFFOR INSTRUMENTS ST222 Compliance dF o Kiln Controller Handbook 89 336 EC EMC Council Directives 2002 96 EC amp 2003 108 EC The crossed out bin symbol placed on this product reminds you of the need to dispose of the product properly at the end of its life Electrical amp Electronic Equipment should never be disposed of E with general waste but must be separately collected for proper treatment In this way you will assist in the recovery recycling amp reuse of many of the materials used in this product SEGMENT al A x gt gt be r T al femperature Programmer C Issue 1 0 Wa rn i nN g Date 05 May 2009 Ensure that thermocouple is correctly inserted into the kiln before firing Stafford Instruments Ltd Tel 44 0 1785 255588 Unit 22 Wolseley Court Fax 44 0 1785 255589 The end of the thermocouple should Staffordshire Technology Park www staffordinstruments co uk protrude into the firing chamber by at sli r email sales stafford inst co uk n attorasnire least 10mm Failure to ensure this ST18 0GA may result in over firing United Kingdom Copyright 2009 Stafford Instruments Ltd Further copies of this document can be found at www staffordinstruments co uk docs st220 user222 pdf Page 12 ST222 Handbook Contents CONUS S annaa 2 Quick Start Guide 3 Programming seereis 4 PIN ee ACA GIANG emenn 6 7 Adjusting While Firing 000 8 9 EOTS css
4. ause Facility While firing press and hold down the DOWN key for about 4 seconds until the control ler beeps The controller will pause the executing program To un pause the program press and hold down the DOWN key again for about 4 seconds until the controller beeps The effects of pausing are as follows If paused during ramping the kiln temperature will be held Soaked indefinitely 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 re mainder of the soak period will be resumed when un pause is selected gt gt Program advance UP key held down for about 4 seconds until the controller beeps can also be used to terminate a pause If paused while ramping then gt gt will cause the controller to go into soak at the current kiln temperature If paused while soaking then gt gt will cause the controller to move onto the next segment Changes made to the operation of the controller in this way are temporary and are not stored While paused a warning double beep is sounded every 30 seconds and FAUSEd is scrolled across the display WARNING PROGRAM PAUSE 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 ST222 Handbook Page 9 Adjusting While Firing
5. cscsrcenardssenasngnsuanecansseaaaiansenrzeents 10 SPECIFICATION aiiin inienn 11 NOUCOS erans 12 Features e Ideal for glass or ceramics use e 9 programs each with up to 9 segments e 1 controlled heating cooling ramp soak per segment e Heating and Cooling indicators e Programs can be altered while firing e Program pause amp advance facilities e Delayed start facility e Power failure recovery e kWh energy used display e Alarm buzzer e Easy to deploy extension lead type format Page 2 ST222 Handbook Specification Electrical Temperature Power supply Temperature setting Voltage range 216 2 253V Range 0 to 1320 C R S Frequency 50Hz nom O to 1200 C K N Phases 1 Resolution 1 C Power 3kW max Control Accuracy Fuse 13A fuse in plug P 1 D Control BS1363 Reading accuracy 0 25 FSD UK version only 1 digit Control Relay Ti Contact type SPST NO aime 13A max Start delay range 00 00 to 99hr 59min Soak time range 00 00 to 99hr 59min Thermocouple Resolution 1 min R S K amp N type Ramps Enclosure Material ABS Flameproof Colour Black Ramp rate 1 to 999 C hour or full power Ramps can be heating or cooling Size 173mm x 85 6mm x 43 5mm less mains cable and gland Weight 652g approx Environmental Location RH Operating Temperature Storage Temperature Sealing Pollution Class Installation Category ST222 Handbook Error Handling Thermocouple fai
6. flash prompting you to enter an optional delayed start use the UP key If no delay is entered the firing will start in 5 seconds or immediately if the START key is pressed again During heating the HEATING INDICATOR will be lit as shown The kiln temperature is displayed and it will ramp up until the pro grammed soak temperature is reached The KILN ON indicator shows when power is ac tually being applied to the kiln When the kiln reaches the programmed soak temperature both the HEATING INDICATOR and the COOLING INDICATOR will be off The kiln remains soaking for the pro grammed soak time The display alternates between showing kiln temperature and showing the soak time remaining During cooling the COOLING INDICATOR will be lit as shown The kiln temperature is displayed and it will ramp down until the pro grammed soak temperature is reached The KILN ON indicator shows when power is ac tually being applied to the kiln At the end of the firing program the display will show End and both the HEATING INDI CATOR and the COOLING INDICATOR will be lit This display will alternate with the ac tual kiln temperature To cancel this display either press the STOP key or turn the con troller off At any time during or after firing the energy used by the kiln in kWh is displayed by pressing and holding down both the UP key and the DOWN key Note the energy used display is reset to zero when the START key
7. key down to get accelerated change of the displayed value Press the STEP key again The soak tem perature in C is now shown This can be changed as required with the UP or DOWN key Note the maximum temperature avail able will be limited by the kiln type Hold UP or DOWN key down to get accelerated change of the displayed value Press the STEP key again The soak time in hours minutes is now shown This can be changed as required with the UP or DOWN key in the range 00 00 no soak up to nearly 100 hours Note hold UP or DOWN key down to get accelerated change of the dis played value Press the STEP key again The SEGMENT display now shows 2 Data for this and other subsequent segments can now be en tered as detailed above maximum of 9 seg ments If no further segments are required then while entering a ramp rate hold down the DOWN key until End is displayed Explanation the full range of displayed values for ramp rate are End 1 999 C hr FULL To mark the end of a program select a ramp rate of End by holding down the DOWN key until End is displayed To add an extra segment press the UP key until your desired ramp rate is shown If you want to heat at full power hold down the UP key until FULL is displayed Note at any time the programming sequence can be terminated either by pressing the RUN key or by waiting 20 seconds without pressing any keys Page 4 ST222 Handbook Program P
8. lt agal n Kiln temperature too high Kiln has Controller relay failure short circuit been on zero power for some time Thermocouple accidently pushed To review firing data Press the gt key to enter the but the kiln temperature has not out of kiln prog ramm i ng menu decreased as expected Kiln temperature overshoot Fire in kiln paper clay lost wax casting exotherm etc To change firing data Dress the A amp V keys to Maximum firing time limit exceeded Contact manufacturer or supplier change the displayed value Maximum room temperature limit Work room too hot exceeded Work room fire Use the key again as necessary to move to lier se soil UU eR 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 WV key To exit the programming menu either wait 10 seconds or press the START key to start firing Page 10 ST222 Handbook 1222 Handbook Page 3 Programming Press the STEP key to display the currently selected flashing program number This can be changed as required with the UP or DOWN key There are 9 fully adjustable pro grams available Note the SEGMENT display shows 1 The firing parameters for segment 1 can now be entered as detailed below Press the STEP key again The ramp rate in C hr is now shown This can be changed as required with the UP or DOWN key in the range 1 to 999 C hr FULL Note hold UP or DOWN
9. lure detection Thermocouple reversal detection Heater failure detection Kiln over temperature detection Room over temperature detection Firing run time hours limiter Alarm buzzer Other Kiln heating indicator Program running indicator For indoor use only Maximum relative humidity 80 for temperatures up to 31 C decreasing linearly to 50 relative humidity at 50 C 0 C to 50 C 10 C to 55 C IP40 2 lI Page 11 Errors Quick Start Guide In the event of an error condition the control e lt ler will display an error code and sound its alarm buzzer The firing will be aborted Make a note of the error number then SWITCH OFF THE KILN amp THE CONTROLLER Refer to the At a Glance centre page of this handbook for a description of the controls Switch on amp wait for kiln temperature display Error Possible Cause Remedy Kiln temperature not increasing as Heater element failure Low mains required The kiln has been on full voltage Kiln door not closed To run a firing program set up previously press power for some time but the properly Controller relay failure E venereal the START key If you do not want a start delay salah the ST222 will start firing after 5 seconds Thermocouple or thermocouple Check thermocouple wiring and wiring open circuit connector If wiring OK then fit new ae To stop firing at any time press the STOP key Thermocouple reversed Thermocouple wiring fau
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