Sterling STT 500 User Manual

Op er ating In struc tions

De hu mid ified Air Dryer
STT 500
with Siemens S7 con trol unit

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Ster ling Ma te rial Pro cess ing

Please note that our address and phone information has changed.
Please reference this page for updated contact information.

These manuals are obsolete and are provided only for their technical information, data and capacities.
Portions of these manuals detailing procedures or precautions in the operation, inspection, maintenance
and repair of the products may be inadequate, inaccurate, and/or incomplete and shouldn’t be relied
upon. Please contact the ACS Group for more current information about these manuals and their
warnings and precautions.

Parts and Service Department

The ACS Customer Service Group will provide your company with genuine OEM quality parts manufactured to engineering
design specifications, which will maximize your equipment’s performance and efficiency. To assist in expediting your phone
or fax order, please have the model and serial number of your unit when you contact us. A customer replacement parts list
is included in this manual for your convenience. ACS welcomes inquiries on all your parts needs and is dedicated to
providing excellent customer service.

For immediate assistance, please contact:

• North, Central and South America, 8am – 5pm CST [phone] for drying, conveying, heating and cooling
and automation. For size reduction: [phone].
North America, emergencies after 5pm CST [phone]

North America email: [e-mail]

• Mexico, Central & South America
Email: [e-mail]

• Europe, Middle East & Africa [phone]

Email: [e-mail]

• India [phone]

Email: [e-mail]

• Asia/Australia [phone]

Email: [e-mail]

Sales and Contracting Department

Our products are sold by a worldwide network of independent sales representatives. Contact our Sales Department for the
name of the sales representative nearest you.

Let us install your system. The Contract Department offers any or all of these services: project planning; system packages
including drawings; equipment, labor, and construction materials; and union or non-union installations.

For assistance with your sales or system contracting needs please Call:

North, Central and South America [phone] or [phone] Monday–Friday, 8am–5pm CST

Europe/Middle East/Africa [phone]
India [phone]
Asia/Australia [phone]

Facilities:

ACS offers facilities around the world to service you no matter where you are located. For more information, please visit us at
www.acscorporate.com

United States:

ACS Schaumburg – Corporate Offices

1100 E. Woodfield Road
Suite 588
Schaumburg, IL 60173
Phone: + 1 847 273 7700
Fax: + 1 847 273 7804

ACS New Berlin – Manufacturing Facility

2900 S. 160th Street
New Berlin, WI 53151
Phone : [phone]
Fax: + 1 262 641 8653

Asia/Australia:

ACS Suzhou

109 Xingpu Road SIP
Suzhou, China 215126
Phone: + 86 8717 1919
Fax: [phone]

Europe/Middle East/Africa:

ACS Warsaw

Ul. Działkowa 115
02-234 Warszawa
Phone: + 48 22 390 9720
Fax: [phone]

India

ACS India

Gat No. 191/1, Sandbhor Complex
Mhalunge, Chakan, Tal Khed,
Dist. Pune 410501, India
Phone: [phone]
Fax: + 91 20 40147576

Ster ling Ma te rial Pro cess ing

5200 West Cinton Ave.

Mil wau kee, WI 53223

Tele phone: [phone]

Fax: [phone]

www.sterlco.com

Tech ni cal ser vice:

Ser vice de part ment
Tele phone: [phone]

Edi tion: 04/02
Or der con fir ma tion num ber: _ _ _ _ _ _ _ _ _ _ _

STT 500

These op er at ing in struc tions are for:*

(* Plea se fill in per so nal ly)

Se ri al num ber:

Built in:

Date of de li very:

Num ber of de li very:

Date of com mis sio ning:

Lo ca ti on:

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Group of ma chi nes:

2

STT 500

Ster ling Ma te rial Pro cess ing re tains all rights to change the in for ma tion in these
op er at ing in struc tions at any time with out no tice.

We as sume no li a bil ity for any er rors or di rect or in di rect dam age re sult ing in con ­text with these op er at ing in struc tions.

Copying, trans la tion or pub li ca tion in any form ex cept for per sonal use of pur -

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chaser re quires ap proval from Ster ling Ma te rial Pro cess ing.

All rights re served.

3

STT 500

TA BLE OF CON TENTS

1. Gen eral In for ma tion ...............................................1-1

1.1. Warn ings and sym bols.............................................1-2

1.2. Ex pla na tions and in for ma tion .......................................1-3

1.3. Le gal ba sis ......................................................1-3

1.4. Fields of ap pli ca tions ..............................................1-3

1.5. Notes on Us age ..................................................1-3

2. Safety in struc tions ................................................2-1

2.1. For your safety ...................................................2-2

2.2. For the safety of the de vices ........................................2-5

3. Start-up ..........................................................3-1

3.1. Con trol sys tem ...................................................3-2

3.1.1. Key as sign ment .........................................3-2

3.1.2. Flow chart..............................................3-3

3.2. Switching on the dryer .............................................3-4

3.2.1. Op er a tion sta tuses.......................................3-4

3.3. Viewing the soft ware-ver sion........................................3-5

3.4. Pass words.......................................................3-5

3.5. Ba sic pa ram e ters .................................................3-7

3.5.1. Turn ing the de vices on/off .................................3-7

3.5.2. En tering dryer val ues.....................................3-9

3.5.3. En tering hop per val ues ..................................3-11

3.5.4. Ob serving pro cess ing sta tus..............................3-13

3.5.5. Set ting date and time....................................3-14

3.5.6. Viewing/chang ing lan guage and con trast ...................3-15

3.5.7. Changing pa ram e ters ...................................3-16

3.5.8. Set ting the timer........................................3-17

3.6. Starting con tin u ous op er a tion ......................................3-18

3.7. Viewing sys tem runtime ...........................................3-19

3.8. Switching the dryer off ............................................3-20

4. Er ror and er ror cor rec tion ..........................................4-1

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4

STT 500

5. Main te nance .....................................................5-1

5.1. Main te nance in ter vals .............................................5-3

5.2. Cleaning/re new ing the air fil ters .....................................5-4

5.3. Ten sioning the V-belts .............................................5-8

5.4. Dis posing of the dry ing agent ......................................5-10

5.5. Ser vicing the ac ces so ries .........................................5-10

5.6. Changing the bat tery of the con trol sys tem ...........................5-11

5.6.1. Re setting the con trol val ues ..............................5-13

6. Func tional de scrip tion .............................................6-1

6.1. Dryer ...........................................................6-2

6.2. Drying hop per (op tional) ...........................................6-3

6.3. Re turn air cooler ..................................................6-4

6.4. Hop per heat ers (op tional) ..........................................6-5

6.5. Au to matic mo tor flaps (op tional) .....................................6-5

6.6. Con nec tion to a pneu matic con vey ing sys tem (op tional) .................6-5

7. Trans port, As sem bly and Stor age ...................................7-1

7.1. Trans port and Packing .............................................7-2

7.2. As sem bly........................................................7-4

7.3. Stor age .........................................................7-4

8. As sem bly in struc tions .............................................8-1

8.1. Mount ing of the suc tion de vice for re gen er a tion ex haust air ..............8-2

8.2. Con nec tion of the air cool ers........................................8-2

8.3. Elec tri cal con nec tion ..............................................8-3

9. Tech ni cal Data ....................................................9-1

10. Spare parts list .................................................10-1

10.1. Switching Cab i net and Op er ating Unit ..............................10-5

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5

STT 500

11. Elec tri cal man ual ...............................................11-1

o Con nec tion di a gram no.: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

o Cur rently not avail able; will be de liv ered at a later date!

12. Ac ces so ries ....................................................12-1

o En tering val ues on the OP 7 / 17

o Flap con trol with Fuzzy-Logic

o Elektror High-pres sure blower with fre quency con verter op er a tion

o Elektror High-pres sure blower

o _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

o _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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6

1. Ge ne ral In for ma ti on

The se ope ra ting in struc tions are ad dres sed to all users of the de vi ce.

De hu mi di fied Air Dry er

»

The se ope ra ting in struc tions must be used by every per son char ged with
work on the unit.

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Ge ne ral In for ma ti on 1-1

De hu mi di fied Air Dry er

1.1. War nings and sym bols

The fol lo wing war nings and sym bols are used in the se ope ra ting in struc tions:

This sym bol in di ca tes dan ger to life! Fa tal or se ri ous in ju ry is pos si ble if the
cor re spon ding in struc tions, re gu la tions or war nings are not ob ser ved.

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F

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This sym bol in di ca tes that se ri ous in ju ry is pos si ble if the cor re spon ding
in struc tions, re gu la tions or war nings are not ob ser ved.

This sym bol in di ca tes that ex ten si ve da ma ge to equip ment is pos si ble if
the cor re spon ding in struc tions, re gu la tions or war nings are not ob ser ­ved.

This sym bol in di ca tes in for ma ti on im por tant for be co ming fa mi li ar with
the equip ment, i.e. tech ni cal cor re la tions.

This sym bol in di ca tes that a tech ni cal term is ex plai ned at this point.

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Ge ne ral In for ma ti on 1-2

De hu mi di fied Air Dry er

1.2. Ex pla na tions and in for ma ti on

Va ri ous terms and de sig na tions are used in the se ope ra ting in struc tions to en su re cla ri ty. The re ­fo re plea se note that the terms used in the text stand for the cor re spon ding ex pla na tions lis ted be ­low.

Equip ment

•

”Equip ment” can mean an in di vi du al unit, a ma chi ne or an in stal la ti on.

Ope ra ting per son nel

•

The ”ope ra ting per son nel” are per sons ope ra ting the equip ment on their own re spon si bi li ty or ac ­cor ding to in struc tions.

Ope ra tor

•

The ”ope ra tor” of the equip ment (pro duc ti on ma na ger, fo re man, etc.) is the per son re spon si ble for
all pro duc ti on se quen ces. The ope ra tor in structs the ope ra ting per son nel of what is to be done.

Ope ra ting in struc tions

•

The ”ope ra ting in struc tions” des cri be the in ter ac ti on of the equip ment, pro duc ti on se quen ces or
me thods. The ope ra ting in struc tions must be com pi led by the ope ra tor of the equip ment.

Equip ment fo re man

•

When se ve ral ope ra ting per son nel work on one ma chi ne, the ”equip ment fo re man” coor di na tes
the se quen ces. The equip ment fo re man must be ap poin ted by the ope ra tor.

Trai ned per son nel

•

”Trai ned per son nel” are per sons who, due to their trai ning, are aut ho ri zed to car ry out the re qui red
work.

1.3. Le gal ba sis

See “Ma nu fac tu rer’s Cer ti fi ca te” resp. “Cer ti fi ca te of Con for mi ty”.

1.4. Fields of ap pli ca tions

For the dry ing of ther mo plas tic gra nu les and re grind be fo re pro ces sing in or der to re mo ve all re ­mai ning moi stu re from the gra nu les both in si de and out, in de pen dent of cli ma te or am bient air
con di tions.

1.5. No tes on Usa ge

Ex pe rien ced ope ra tors can be gin di rect ly with the chap ter on “Start-up” if the unit has been pro -

•

per ly in stal led.

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If the unit has not been in stal led yet, ob ser ve the in struc tions in the chap ter on “As sem bly In struc -

•

tions” and “Trans port, As sem bly and Sto ra ge”.

Ge ne ral In for ma ti on 1-3

2. Sa fe ty in struc tions

The se sa fe ty in struc tions ap ply to all per sons wit hin the ran ge of ac ti on of the
equip ment.

»

Plea se in form all per sons wit hin the ran ge of ac ti on of the equip ment of the
di rect and in di rect ha zards con nec ted with the equip ment.

The se ope ra ting in struc tions are to be used by all per sons as sig ned ac ti vi ­ties con nec ted with the equip ment.

Knowled ge of the En glish langua ge is pre re qui si te.

En su re in each case that the ope ra ting per son nel are fa mi li ar with the ope ra ­ting in struc tions and the functi on of the equip ment.

De hu mi di fied Air Dry er

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Sa fe ty in struc tions 2-1

De hu mi di fied Air Dry er

2.1. For your sa fe ty

Ge ne ral

The ope ra ting per son nel of this equip ment must be at least 16 ye ars old.

Plea se read the se ope ra ting in struc tions ca re ful ly be fo re ta king into ope ra ti on for the first time.
Con tact us should que stions ari se. This avoids in ju ry and da ma ge to equip ment!

The se ope ra ting in struc tions must be kept avai la ble at all ti mes at the pla ce of ope ra ti on of the
equip ment. Im pro per ope ra ti on re sults in dan ger of ac ci dents!

Plea se note that, for rea sons of cla ri ty, not all con cei va ble ca ses re gar ding ope ra ti on or main ten ­an ce of the equip ment can be co ver ed in the se ope ra ting in struc tions.

Plea se ob ser ve all sa fe ty in struc tions and war nings on the equip ment. This avoids in ju ry and da ­ma ge to equip ment!

All work on the equip ment is to be car ried out by per sons who se qua li fi ca tions are spe ci fied in the
per tai ning chap ters of the ope ra ting in struc tions. Im pro per ope ra ti on re sults in dan ger of ac ci ­dents!

The pro per wor king clot hes are to be worn du ring any work on the equip ment. This avoids in ju ry!

The lo cal re gu la tions and re qui re ments per tai ning to this equip ment must be ob ser ved.

Dis con nect elec tri cal com po nents from the mains supp ly be fo re work is car ried out on the se com ­po nents Cau ti on: Dan ger to life through elec tri cal shock!

Com pi le de tai led ope ra ting in struc tions ba sed on the se Ope ra ting in struc tions for the se quen ce
of pro ce du res to be car ried out on this equip ment. Im pro per ope ra ti on re sults in dan ger of ac ci ­dents!

Ob ser ve that the con trol sys tem is still un der vol ta ge even when the main switch is swit ched off.
Cau ti on: Dan ger to life through elec tri cal shock!

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Sa fe ty in struc tions 2-2

De hu mi di fied Air Dry er

As sem bly

Com pa re the con nec ted lo ads with tho se of the mains supp ly. Dan ger of in ju ry through elec tri cal
shock!

When using lif ting gear, plea se ob ser ve the per tai ning re gu la tions. Cau ti on: Dan ger of ac ci dents!

Do not mo di fy, add ot her equip ment or chan ge the de sign of the equip ment wit hout the ap pro val
of the ma nu fac tu rer. Cau ti on: Dan ger of ac ci dents!

At tach ments not supp lied by Ster ling must be ma nu fac tur ed in ac cor dan ce with sa fe ty re gu la ti on
EN 294. Dan ger of ac ci dents!

The equip ment may only be ope ra ted when all the as so cia ted com po nents are pro per ly con nec ­ted up and in ac cor dan ce with the re le vant re gu la tions. This avoids in ju ry and da ma ge to equip ­ment!

Ope ra te the de vi ce only if all its com po nents are groun ded. Dan ger: ac ci dent through elec tri cal
shock!

Plea se note for in stal la ti on that the equip ment is top-he avy. Dan ger exists that it may topp le over!

Take care that the de vi ce is not stan ding on the mains ca ble. This will pre vent dan ger to peo ple
and ma te ri al!

Ope ra ti on

Ap point an equip ment fo re man to be re spon si ble for the equip ment.

En su re that the ope ra ting per son nel are pro vi ded de tai led in struc ti on in the ope ra ti on of the
equip ment. Im pro per ope ra ti on re sults in dan ger of ac ci dents!

When the main switch is swit ched off for rea sons per tai ning to sa fe ty, it must be se cu red against
un aut ho ri zed ac ti vat ion. Cau ti on: Dan ger of ac ci dents!

Re pair work may be car ried out by trai ned per son nel only. Cau ti on: Dan ger of ac ci dents!

Ne ver ope ra te the equip ment when parti al ly dis mant led! Dan ger! Limbs may be caught in ma chi ­ne ry! Elec tric shock!

In case of mal functi on, shut down the equip ment im me di ate ly. Have mal functions cor rec ted im ­me di ate ly. Dan ger of ac ci dents!

The ma chi ne is in ten ded only for the dry ing of gra nu la ted plas tics. Any ot her or ad di tio nal use is
con tra ry to spe ci fi ca tions.

This equip ment is not suit ab le for food pro ces sing.

The sa fe ty in struc tions of the con nec ted ma chi nes must be fol lo wed.

Plea se note that sound le vels ex cee ding 85 db(A) may in the long term da ma ge your he alth. Use
the ap pro pria te ear muffs. This avoids im pair ment of hea ring!

Plea se note that the dry ing cells, dry ing hop pers and air pi pings grow hot du ring use. Avoid tou ­ching any of the se parts! Dan ger: In ju ry through burns!

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Ne ver ope ra te the dry er wit hout side pa nels. Dan ger: Limbs may be caught in ma chi ne ry! In ju ry
through burns!

Sa fe ty in struc tions 2-3

De hu mi di fied Air Dry er

When dry ing plas tics which emit ga ses dan ge rous for hu man he alth, take care that the re ge ne ra ­ti on ex haust air is dis po sed of wit hout pol lu ting the en vi ron ment. This will pre vent dan ger to peo ­ple and ma te ri al!

Main ten an ce

Be fo re star ting main ten an ce work, ap point a su per vi sor.

In form the re spon si ble per son nel be fo re main ten an ce work on the sys tem is start ed. Cau ti on:
Dan ger of ac ci dents!

Dis con nect the equip ment from mains supp ly be fo re star ting main ten an ce pro ce du res to en su re
that it can not be swit ched on un in ten tio nal ly. Cau ti on: Dan ger of ac ci dents!

All pi pes, ho ses and scre wed con nec tions should be che cked re gu lar ly for le aks and da ma ge.
Any faults which ari se should be cor rec ted im me di ate ly. Dan ger of ac ci dents!

De pres su ri se all com pres sed air pi ping be fo re star ting main ten an ce work. Dan ger of ac ci dents!

The air fil ters should only be clea ned/re pla ced when the the main switch is off and the blo wer has
stop ped. This avoids in ju ry and da ma ge to equip ment!

Any main ten an ce work on the equip ment should only be start ed when the the main switch is off
and the blo wer has stop ped. This avoids in ju ry and da ma ge to equip ment!

Check the v-belts of the blo wer only when the main switch is swit ched off and the blo wers have
stop ped. Cau ti on: Dan ger of ac ci dents!

Open dry ing hop pers only if they are com ple te ly emp ty. Dan ger of ac ci dents!

Ne ver open dry ing hop pers whi le the de vi ce is in ope ra ti on. Dan ger: Iin ju ry through burns!

Open dry ing hop pers only if they have been coo led down suf fi cient ly. Dan ger: In ju ry through
burns!

Be fo re star ting main ten an ce work wait un til the dry ing cells, dry ing hop pers and air pi pings have
been coo led down suf fi cient ly. Avoid tou ching any of the se parts! Dan ger: In ju ry through burns!

Re mo ve any gra nu les re mai ning on the ground. Dan ger of ac ci dents!

Ar rest the wheels af ter in stal la ti on if the dry er is moun ted on a mo va ble fra me. This will pre vent
dan ger to peo ple and ma te ri al!

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Sa fe ty in struc tions 2-4

De hu mi di fied Air Dry er

2.2. For the sa fe ty of the de vi ces

Ne ver chan ge set tings wit hout ca re ful ly as ses sing the con se quen ces.

Use only ori gi nal Ster ling spa re parts.

Ob ser ve the main ten an ce in struc tions.

Keep a re cord of all main ten an ce works and re pairs.

Plea se note that elec tro nic com po nents can be da ma ged by sta tic disch ar ge.

Be fo re in iti al ope ra ti on and in re gu lar in ter vals, make sure that no elec tri cal con nec tions are loo ­se.

Ne ver re ad just sen sors wit hout ex act ly kno wing their functions.

Plea se en su re that the per mit ted sto ra ge tem pe ra tu re lies bet ween -20 and +55 °C
(-4 to +131 °F).

Plea se en su re that the per mit ted ope ra ti on tem pe ra tu re lies bet ween 0 and +45 °C
(32 to +113 °F).

Check the di rec ti on of ro ta ti on of the blo wers af ter the elec tri cal con nec tions have been made
(see ro ta tio nal di rec ti on ar row).

Cle an the dry ing hop pers be fo re the first fil ling.

Note the in struc tions of the ma te ri al ma nu fac tu rer for the ma xi mum dry ing tem pe ra tu re.

Note the dry ing in struc tions of the ma te ri al ma nu fac tu rer.

Take care that the dry ing hop pers are al ways com ple te ly fil led and that the re ten ti on pe ri od is re ­spec ted if con ti nu al re mo val is ta king pla ce.

Note that too lar ge amounts ta ken from the dry ing hop per lead to in suf fi cient dry ing of the ma te ri ­al.

Clo se the air stop val ves of dry ing hop pers which are emp ty or have not been used.

Note down all data which you have en te red into the con trol sys tem.

The pass word is to be en trus ted to aut ho ri sed per son nel only.

Plea se note that the tem pe ra tu re of the dry er hea ting sys tem must al ways be set lo wer than that of
the supp le men ta ry hea ters.

When you dis po se of dry ing agents, ob ser ve all of fi ci al ru les.

Note that dry ing cells are re pla ced or re fil led by Ster ling only if they are emp ty.

The ma te ri al le vel may not fall be low 40 % in the dry ing hop per, when ma te ri al is con ti nu ous ly re ­mo ved from the dry ing hop per, but no ma te ri al is con ti nu ous ly fed into the dry ing hop per (batch
dry ing). Clo se the thrott le val ves.

Read the ope ra ting ma nu als of the con nec ted de vi ces.

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Sa fe ty in struc tions 2-5

3. Start-up

STT 500

This chap ter is di rec ted at the ope ra tors of the equip ment.

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F

This chap ter as su mes ge ne ral skills in dea ling with dry ing sys tems and SPS
(PLC) con trol units.

This chap ter as su mes that the functio nal des crip ti on has been read and un ­ders tood.

It should be en su red in each and every case that the ope ra tors have the re le ­vant skills.

Note down all set values of the control system.

Make sure that the cooling appliance is connected to the mains socket in
the electrical cabinet (if present, optional).

Make sure that any condensate penetrating from the cooling appliance
(optional) does not get inside the dryer or the control box.

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If the in side tem per a ture of the switch cab i net is above +50°C(122°F),
the dryer is switched off af ter 30 min utes if it is op er ated with a cool ing ap ­pli ance (op tional).

Start-up 3-1

STT 500

3.1. Control system

The control system is switched on at the main switch. The control system is operated via a
”selection window” and the keyboard of the operator panel.

The facility’s control system is factory-programmed. Nevertheless, you have to set specific
values (basic parameters) which are dependent on the processed material, for instance.

The values entered are stored in the control system and remain so, even after the unit is switched
off or in the event of a power cut. All messages are displayed in plain text.

In describing this start-up, we have assumed that the various sub-menus are selected from the
”table of contents”.

This structure of the description has been selected since, in most cases, you will only work on one
item in the ”submenu”.

If you want to work on several ”submenu” items in succession, you can select the individual items
directly by means of the arrow keys.

3.1.1. Key assignment

F1-key: Leads to the table of contents.

ENTER-key: Confirms the entries.

ESC-key: Goes back one step in the menu.

ACK-key: Activates an alarm message; to unblock the control system.

Arrow keys: Move the cursor bar;

switch the appliances on or off in combination with the SHIFT key;
for scrolling forward or backward in a menu.

SHIFT-key: Switches on the secondary functions of the keys,

when the SHIFT-key has been pushed, the LED “SHIFT” is on.

HELP-key: Viewing additional texts,

when additional texts can be viewed the LED “HELP” is on.

LED “ALARM”: A failure is given by flashing of the LED “alarm”.

If the alarm message is acknowledged by pressing
of the “ACK” key, but the failure is not yet eliminated,
the flashing changes to steady light.
When there is no failure the LED is off.

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LED = light emitting diode

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An additional alarm device (horn or lamp) can be connected (optional).

Start-up 3-2

3.1.2. Flow chart

STT 500

4 5 6 7

3

2 1
2

3

10 9 8

1 Indicator lamp
2 Valve system
3 Drying chamber
4 Drying blower
5 Return air filter
6 Drying hopper
7 Drying heater
8 Regeneration heater
9 Regeneration blower
10 Regeneration air filter

Indicator lamp messages:

Green continous light: in process

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Red continous light: alarm

Start-up 3-3

3.2. Switching on the dryer

Switch on the system by means of the main switch.

STT 500

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The control system carries through a self-test; after that, the name of the
dryer and the operation status of the unit are displayed.

Unblock the control system:
Keep the ACK key pressed until the LEDs of the keys K1 - K4 light up.

F

3.2.1. Operation statuses

The following operation statuses can be displayed:

system is off

•

system is on

•

blower runs on

•

valve block

•

regeneration will be finished in x min.

•

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Start-up 3-4

3.3. Vie wing the soft wa re-ver si on

Press the “±”-key.

STT 500

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3.4. Passwords

The entry of a password prevents unauthorised persons from having access to the data entered
into the control system. Important data can then be entered or modified only after the password
has been entered.

If you make no entries for more than 10 minutes, the access is blocked and you have to re-enter
the password.

password level 6: 79 21 54

•

The soft wa re-ver si on will be dis play ed.

Tell the password only to authorised persons.

F

Press the ”Shift”-key and the ”K4”-key.

Press 3 x the “â” key.

Press the ”F3”-key.

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Start-up 3-5

Login

Press the key “F2".
En ter the pass word.
Press the ENTER key.

STT 500

&

Press the ESC key.

Logout
Press the key “F3".

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Press the “â“ key.

Edit

Press the key “F2".

If the pass word has been en tered cor rectly, the cor re spond ing pass word
level is dis played.

You can now en ter data into the con trol sys tem or mod ify data which have
al ready been en tered.

Only data for which no pass word is nec es sary (= pass word level 0) can
now be en tered into the con trol sys tem or mod i fied.

&

Press the ”F1"-key.

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This func tion is avail able only for pass word level 9.
Pass words and pass word lev els can be mod i fied or en tered.
Con firm your en tries by means of the ENTER key.

Start-up 3-6

3.5. Basic parameters

Press the ”F1"-key.

3.5.1. Turning the devices on/off

Select ”Main menu”.
Acknowledge with the ENTER-key.

or

Press the ”F2”-key.

Dryer on/off

”on” = turn dryer on, ”off” = turn dryer off.
Acknowledge with the ENTER-key.

Timer on/off

Press the SHIFT-key and choose with the arrow-keys the desired operation:
”internal” = operation with timer (operation at OP7, see chapter timer),
“external” = operation with timer (if present),
”off” = operation without timer.
Acknowledge with the ENTER-key.

STT 500

&

Press the “â” key.

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Re turn air coo ler on/off

“on” = ope ra ti on with re turn air coo ler,
“off” = ope ra ti on wit hout re turn air coo ler
Ack nowled ge with the EN TER-key.

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Press the “â” key.

The timer is only operating, when the dryer is switched on.

If the unit ope ra tes with a re turn air coo ler (op tio nal):

Start-up 3-7

Hop per X on/off (X = num ber of the dry ing hop per)

“on” = re lea sing dry ing hop per X,
“off” = bloc king dry ing hop per X
Ack nowled ge with the EN TER-key.

Hop per hea ter X on/off (X = num ber of the hop per hea ter)
“on” = switch on hop per hea ter X,
“off” = switch off hop per hea ter X
Ack nowled ge with the EN TER-key.

Press the ”F1"-key.

STT 500

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Start-up 3-8

3.5.2. Entering dryer values

Select ”Dryer”.
Acknowledge with the ENTER-key.

or

Press the ”F3”-key.

Regeneration Heater Act.

The regenerated heat temperature will be displayed.

Used air Act.
The current temperature of the used air will be displayed.

Press the “â” key.

STT 500

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Dew point max.

En ter the max i mum per mis si ble (worst al lowed) dew point tem per a ture (-35 to 28 °C) (-31 to

82.4°F)..
Ac knowl edge with the EN TER-key.

Dew point Act.

The cur rent dew point tem per a ture will be dis played.

&

Press the “â” key.

If the unit op er ates with “Dew point de pend ent re gen er a tion switch” (op ­tional):

If there is a ca ble break “+0 °C” (32°F) is dis played.

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Start-up 3-9

STT 500

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Re turn air cooler Tar get
En ter the max. per mis si ble re turn air tem per a ture (65 °C max.) (149°. F) Higher tem per a tures are
not al lowed. Ac knowl edge with the EN TER-key.

Re turn air coo ler Act.
The cur rent re turn air tem pe ra tu re will be dis play ed.

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If the unit ope ra tes with a re turn air coo ler (op tio nal):

The coo ling ef fect of the re turn air coo ler is highly de pen dent on the coo ­ler cir cuit.

The lo wer the va lue cho sen for the re turn air tem pe ra tu re, the bet ter the
ef fi cien cy of the dry ing cells.

Plan the size of the coo lant cir cuit ac cor ding ly.

F

Press the ”F1"-key.

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Start-up 3-10

STT 500

3.5.3. Entering hopper values

Select ”Hopper”.
Acknowledge with the ENTER-key.

or

Press the ”F4”-key.

Hopper entry X Target

(X = number of the drying hopper)
Enter the drying temperature for hopper flap X (when operating with supplementary heating).

Acknowledge with the ENTER-key.

Hopper entry X Act.

(X = number of the drying hopper)
The current temperature at the feed opening of hopper flap X will be displayed.

&

F

Press the “â” key.

If there is a ca ble break “+0 °C” (32°F) is dis played.

The lowest drying temperature setting of the hopper flap must be the
same as or higher than the drying temperature.

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Start-up 3-11

STT 500

&

Gran ules X
tar get: _ % = _ °C (F°)

(X = num ber of the dry ing hop per)
En ter the ma te rial tem per a ture at which the flap (op tional) on the dry ing hop per X should close.
Con firm with the EN TER key.

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Gran ules X
act.: _ °C

(X = num ber of the dry ing hop per)
The cur rent ma te rial tem per a ture in the dry ing hop per X is dis played in °C (F°) (op tional, if there is
a flap).

If the unit op er ates with mo tor flaps (op tional):

This value is en tered in per cent of the tem per a ture on the hop per in let.

The ma te rial tem per a ture cal cu lated by the con trol sys tem for clos ing the
flap on the dry ing hop per X is dis played in °C (°F).

Press the ”F1"-key.

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Start-up 3-12