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ST325 User Handbook

 

To exit programming mode at any time wait 10 seconds without 
pressing any keys - the ST325 will then revert to the idle display.  
Alternatively press the START/STOP key to exit programming and to 
begin firing immediately. 

The

§

 

key can be used to reverse through the programming steps to 

correct errors or to exit programming mode. 

Available ramp rate displays are: 

End

… 

999

 

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 

©

 

key until  

FULL

 

is displayed. 

Programming Notes 

Programming 

To declare the end of a program while prompted for a ramp rate push 
the 

ª

 key until 

End

 is displayed. 

FAQ (Frequently Asked Questions) 

During programming the COOLING lamp sometimes flashes when I want the 
kiln to heat - why is this? 

The ST325 asks you to input the ramp rate before it asks for the soak 
temperature so if the (still to be set) soak temperature in the current segment is 
less than the soak temperature in the previous segment the ST325 will assume 
cooling is required.  This anomaly will be rectified when all of the program has 
been entered.  This can be confirmed by stepping through the completed 
program with the 

¨

 key. 

Q: 
 

A: 

During programming the HEATING lamp sometimes flashes when I want the 
kiln to cool - why is this? 

The ST325 asks you to input the ramp rate before it asks for the soak 
temperature so if the (still to be set) soak temperature in the current segment is 
more than the soak temperature in the previous segment the ST325 will 
assume heating is required.  This anomaly will be rectified when all of the 
program has been entered.  This can be confirmed by stepping through the 
completed program with the 

¨

 key. 

Q: 
 

A: 

During programming 

End

 is displayed when I want to enter another segment - 

why is this? 

Available ramp rate displays are: 

End

… 

999

 

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 

©

 

key until  

FULL

 

is displayed. 

Q: 
 

A: 

How do I declare the end of the program? 

Press the 

¨

 key to advance to the next segment.  Push the 

ª

 key until 

End

 

is  

displayed.  (Press the 

¨

 key again to exit programming mode).  

Q: 
 

A: 

ST325 User Handbook

 

 

 

 

 

       

Page

  

17 

Program Pause Facility 

While firing press and hold down the green f

n

 

(function) key then press the 

▌▐

 (pause) key.  The ST325 will pause the executing program.  To un-

pause the program repeat the above key press sequence.  The effects of 
pausing are as follows:- 
 
If paused during  ramping the kiln temperature will be held (soaked) 

indefi-

nitely

 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

 

►►

can also be used to terminate the pause.  This will 

advance the segment and will immediately terminate a paused soak - ad-
vancing to the next segment (if any). 
 
Changes made to the operation of the ST325 in this way are temporary 
and are not stored. 

 600

 

°C 

°C/hr 

hr.min 

As a warning during pause a double 
beep is sounded every 10 seconds 
and the display scrolls 

PAUSed

.  The 

PAUSED lamp to the bottom left of 
the main display is lit. 

Adjusting While Firing 

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. 

Summary of Contents for ST325

Page 1: ...ime hr min Notes Please photocopy me Please photocopy me ST325 User Handbook Page 1 ST325 User Handbook ST325 Temperature Programmer TAFFOR S D Stafford Instruments Ltd Tel 44 0 1785 255588 Fax 44 0 1785 255589 www staffordinstruments co uk email support stafford inst co uk Issue 1 02 Date 21 Feb 2011 See separate handbook for User Instructions Copyright 2011 Stafford Instruments Ltd ...

Page 2: ...nvestigated and rectified by your installer or kiln service engineer Technical note any error message will cause the alarm relay to open see installation handbook for details 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 recom mended such as the Staf...

Page 3: ... The kiln temperature exceeds the desired temperature by at least 10 C 50 C installer selectable Err5 C C hr hr min Error 6 Maximum firing time exceeded The length of the current firing has exceeded an installer selectable 10 999 hours limit Err6 C C hr hr min Possible causes are contactor failure or thermocouple connection intermittent or high resistance ST325 User Handbook Page 3 Quick Start Gui...

Page 4: ...the firing the fan remains off while the kiln temperature is below the fan start temperature The fan starts when the kiln temperature has risen to the fan start temperature and remains on until the kiln tem perature has risen to the fan stop temperature The fan then turns off and stays off until the end of the program The instrument will now reset and the new fan control temperatures will be store...

Page 5: ...he firing and when the kiln has cooled naturally to the damper open temperature the damper will open Control Relay ST325 User Handbook Page 5 Turning On tC r tC S tC n tC K When turned on the ST325 performs a display test by briefly illuminating all of the display digits and all of the front panel lamps The version number of the embedded software is now displayed If you need technical support you ...

Page 6: ...utput a fan control output or an event output 00 15 C C hr hr min While displaying a soak time the event relay can be switched on or off by hold ing in the fn function key then pressing the event key The event relay will be closed when the event lamp is on Control Relay Event Output Card Reader This controller has a card slot for a micro SD mem ory card the same type of card as used on many mobile...

Page 7: ...amp it was pre viously executing For power failure during soaking the ST325 ramps back up to soak tem perature at the correct ramp rate then applies the remaining soak period Power failure recovery can be disabled if required see installation hand book the ST325 will then lock up with FAIL displayed and kiln off in the event of power failure ST325 User Handbook Page 7 When not firing no lamps lit ...

Page 8: ...d This can be confirmed by stepping through the completed program with the key Q A During programming End is displayed when I want to enter another segment why is this Available ramp rate displays are End 1 999 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 key until FUL...

Page 9: ...amics Programs Note It has been found that a kiln controller will give greater heat work as the temperature increases Therefore to achieve a stoneware firing of cone 8 9 we suggest setting the final soak temperature to 1235 C A slight adjustment can then be made after the first firing It should be remembered that kiln controllers are indicators of temperature and the effects of faster or slower fi...

Page 10: ...eating Cooling Ramps The ST325 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 ...

Page 11: ...onds 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 Firing Hint it is good practice to check that the program is correct by pressing the key checking the program number program contents be...

Page 12: ... Kilncare Ltd www kilncare co uk and The Creative Glass Guild www creativeglassguild co uk Sample Glass Programs ST325 User Handbook Page 13 2 mp te hr Seg 2 Soak Temp C Seg 2 Soak Time hr mn Seg 3 Ramp Rate C hr Seg 3 Soak Temp C Seg 3 Soak Time hr mn Seg 4 Ramp Rate C hr Seg 4 Soak Temp C Seg 4 Soak Time hr mn Seg 5 Ramp Rate C hr L 840 00 20 FULL 538 00 45 182 427 00 15 End L 824 00 20 FULL 538...

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