page ST301 user handbook 8 characteristics characteristics this instrument complies with council directive 89/336/eec (electromagnetic compatibility) & council directive 73/23/eec (low voltage safety) electrical power supply voltage range: 216.2 - 253v frequency: 50hz (nom) phases: 1 power: controller 3va (max) switched output(s) 75va fuse: 1.0a slow-blow control relay(s) contact type: spst no switched live - nominal 230vac output @300ma max. thermocouple types: r type standard (k,n & s type also available) connectors 2-part connectors max. wire size 2.5mm2 thermocouple failure detection thermocouple reversal detection heater failure detection over-temperature detection error handling temperature temperature setting (t1 & t2) range: 0 to 1320oc resolution: 1oc control accuracy p.i.d. control reading accuracy: 0.25% fsd 1 digit time start delay range 00:00 to 19hr 59min soak time range 00:00 to 19hr 59min resolution: 1 min environmental operating temperature range: 0 to +40c storage temperature range: -10o to +55oc enclosure sealing: ip65 material: abs colour: light grey ral 7035 size: 120x122x58mm fixings: 90x110mm (4 off) program 1 program with 2 ramps & 1 soak 1st ramp rate: 10 to 399c/hour or full power 2nd ramp rate: full power ST301 user handbook page 1 ST301 user handbook s taffor d instruments stafford instruments ltd. tel: +44(0)1785 604561 fax: +44(0)1785 602381 www.stafford-inst.co.uk email: support@stafford-inst.co.uk http://www.stafford-inst.co. uk/docs/ST301/user301.pdf issue: 1.0b date: 31 july 2002 ST301 temperature controller free datasheet http://
page ST301 user handbook 2 setting setting run halt ramp oc/hr soak hr.min t2 oc oc t1 delay hr.min t2 oc oc t1 delay hr.min soak hr.min ramp oc/hr this allows the start of a firing to be delayed in the range 00.00 to 19.59 hours.mins. this sets the initial ramp rate in the range 10 to 399c per hour or to full power. this is the rate of rise to temperature t1. this can be set in the range 0 to 1320c and is the target temperature for the initial ramp. this can be set in the range 0 to 1320c and is the final or soak temperature. the ramp rate from t1 to t2 is full power. this can be set in the range 00.00 to 19.59 hours.mins. and is the time the controller dwells or soaks at temperature t2. when the controller is halted no lamps on the firing mimic curve are illuminated and the display shows the kiln temperature. the controller settings can be changed, if necessary, by pressing the appropriate key. the corresponding lamp on the mimic curve will flash and the currently-stored value will be displayed. this can be altered using the ? & a keys. holding these keys down allows rapid ch ange in the displayed value. if no keys are pressed for 5 seconds the display will revert to showing kiln temperature. all settings are remembered when the controller is turned off. ST301 user handbook page 7 1 2 1 kiln heater contactor n thermocouple connections + - sk1 + sk2 6 contactor coil suppressor (must be fitted) auxiliary contactor contactor coil suppressor (must be fitted) n n e l k1 k2 k3 l n e l n e wiring in if a pre-wired cable & plug is not fitted then the instrument can be wired to the kiln as shown below. the instrument is fitted with 2-part connectors to facilitate wiring. the maximum wire size is 2.5mm2. ST301 controller installation k - a l n e alarm contactor kiln heater contactor note the (optional) alarm rela y contacts close at the start of firing and open when firing is complete. the contact s also open if the kiln temperature exceeds the required temperature by 20c for more than 15 minutes. this relay can be used to drive a secondar y contactor to isolate kiln power. free datasheet http://
page ST301 user handbook 6 wiring if the instrument has been pre-wired with a cable & plug ensure that the plug is compatible with the connector fitted to the kiln. the standard connector is harting type han 7d or similar. connector 7 6 2 1 5 3 4 han 7d pinout view on pins kiln connections kiln heater contactor thermocouple connections + - contactor coil suppressor (must be fitted) auxiliary contactor contactor coil suppressor (must be fitted) n e l 3 4 6 7 1 5 2 han 7d connector compatible kiln connector wiring is shown below:- connector pin list 5 6 7 earth neutral to contactors mains neutral supply thermocouple + thermocouple - mains live supply kiln power contactor live alarm contactor live earth installation kiln heater contactor alarm contactor 1 2 3 4 ST301 user handbook page 3 firing firing pressing this key will start a firing or abort a firing that is in progress. the status of the firing is shown on the firing mimic curve. if a start delay has been requested then the mimic delay lamp will light and the delay time remaining will be displayed. run halt during firing the kiln temperature is displayed. the value of any of the controller settings can also be displayed by pressing and holding down the appropriate key. during soaking the soak time remaining is displayed. on commencing a firing th e kiln is heated from th e starting temperature to temperature t1 at a rate determined by the ramp setting. upon reaching t1 the kiln will be heated at full power to temperature t2 , the soak temperature. it will soak at this temperature for the soak period. it will then cool naturally with the lamp on the cooling section of the firing mimic curve lit. this lamp will stay on until the kiln has cooled to 40c. errors errors err1 err2 err3 the kiln temperature is not increasing as required. possible causes are: kiln door or lid not closed properly, heater elemen t failure, power phase failure or thermocouple short-circuit. thermocouple or thermocouple wiring open circuit. check wiring / replace thermocouple. thermocouple reversed (temperature less than ?50c). check wiring. err4 kiln temperature has exceeded required temperature by more than 20c for 15 minutes. the alarm relay (if fitted) has been de-energised. this indicates a kiln contactor fault ? check. an indicator in the top left of the display lights when the kiln is being heated. another indicator near the to p middle of the display lights when the keyboard is locked ? this is an anti-tamper f eature. to lock or unlock the keyboard press the ? & a keys simultaneously. free datasheet http://
page ST301 user handbook 4 isolate before removing cover safety warnings warning isolate kiln & controller from electrical supply before opening this instrument for installation, configuration or repair purposes installation installation installation category: ii pollution class: 2 230v ~ 50hz 1.0a fuse: 1.0a anti-surge wickmann type tr5 t1a 250v installer information ip65 emc to meet electromagnetic compatibility requirements both the thermocouple lead and the power leads should not exceed 3.0m in length. this instrument is designed for use mainly in domestic & light industrial environments where electromagnetic interference may cause a loss of accuracy of the displayed temperature reading of up to 3c. specified accuracy will be restored when the interference is removed. ST301 user handbook page 5 contact suppression the coil of each contactor must be suppressed with an rc filter network. the rc network must be connected dir ectly across the coil terminals on the contactor. suitable proprietary rc filter networks fitted with insulated wire leads are:- 1. rs components part no. 210-364 2. rs components (tab fixing) part no. 210-370 3. farnell electronic components part no. 218-893 mounting mounting location mount the instrument on a suitable vertical surface which will not get hot. choose a position where the instrument is not exposed to direct heat from the kiln - especially wh en the kiln door or lid is open. the cable entry in the instrument base should normally be positioned downwards to guard against moisture ingress. mounting centres the mounting centres are marked on the back of the instrument enclosure and are 90mm x 110mm. to expose the mounting holes in the instrument base remove the instrument?s front panel which is secured with cross-head screws. installation free datasheet http://
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