T-935 3/3F/4F

TECSYSTEM S.r.l ®INSTRUCTION MANUALT-9353/3F/4FTECSYSTEM S.r.l.Via Cristoforo Colombo, 5/C20094 Corsico (MI)tel. +39 - 02 - 48601011 / 4581861Fax: +39 - 02 – 48600783http://www.tecsystem.itR.2 06/03/03T-935-3-3F-4F protection relays

TECSYSTEM S.r.l ®BTMT220VCA-24VCAPT-73FIG.2T-935T-935Possible parallel connection of Alarm and Fault relays1 2 3 4 5 6 7 8 9 10 11Fig.32 T-935-3-3F-4F protection relays

TECSYSTEM S.r.l ®1) PROGRAMMAZIONEAUXILIARY POWER SUPPLY• Rated voltage 24-240 Vac-dc• Maximum ratings 20-270 Vac-dc• Vdc with reversible polaritiesINPUTS• 3 inputs RTD Pt100 sensors-3 wires• 4° additional input por Pt100 on Mod.• T-935 4F• removable rear terminals• input channels protected against electromagneticnoises and spikes• sensors length cables compensation upto 500 m (1 mm²)• opt. Analogue inputs 4-20 mA(range 0-200°C)TESTS AND PERFORMANCES• Assembling in accordance with CErules• Protection against electrical and magneticnoises CEI-EN50081-250082-2• Dielectric strength: 2500 Vac for 1 minutefrom relays to sensors,relays topower supply, power supply to sensors• Accuracy: ± 1% full scale, ± 1 digit• Ambient operating temperature –20°Cto +60°C• Humidity 90% no-condensing• ABS self-extinguishing housing-NORYL94VO• Frontal polycarbonate-IP65• Burden 3VA• Data storage 10 years minimum• Digital linearity of sensors signal• Self-diagnostic circuit• Reading and programming accuracy ±1 digit• Opt. Frontal plastic protection• Opt. Protection treatment of electronicpartDIMENSIONSCOMMUNICATION• Not available on this model• See T-935 FO DIGITAL/ANALOGUEOUTPUTS• 2 alarm relays (ALARM-TRIP)• 1 alarm relay for fan control on Mod. 3Fand 4F• 1 alarm relay for sensor fault or workinganomaly (FAULT)• opt. 1 analog output 4-20mA (with externalfeeder)• output contacts capacity: 5A-250Vacres.• Output relays testDISPLAYNG AND DATA MANAGEMENT• 1 dispaly 13mm high with 3 digits for displayingtemperatures• led for displaying reference channel• led indicating alarm or trip channel• led indicating fault• temperature monitoring from 0°C to 200°C• 2 alarm thresholds• 2 alarm ON-OFF thresholds for fan controlon Mod. 3F and 4F• sensors diagnostic (Fcc-Foc- Fcd)• entering the programming by frontalpush button• automatic output from programming cycleafter 1 minute of no-operation• wrong programming automatic display• programmed data call out• possibility of set automatic channelscanning, hottest channel, manual scanning• maximum temperatures and alarmreached storage• frontal alarm RESET push button• possibility of set HOLD function for outputrelays• 96X96MM-DIN43700-prof. 140mm(with rear terminals)• panel cutout 92x92mmT-935-3-3F-4F protection relays3

TECSYSTEM S.r.l ®2) MOUNTINGMake a hole with the dimensions of 92x92 mm in the panel plate.Fasten firmly the unit by the fixing blocks you are equipped with.3) POWER SUPPLYThe T-935-3-3F-4F unit has a Universal Power Supply: it can be supplied indifferently from24 to 240 Vac-dc without any respect to the polarities.This feature is obtained by the application of a tried power supplier which provides the installerfree from the worries concerning the correct Vac or Vdc power supply.The ground cable must be fixed to the clamp 41.When the unit is supplied directly from the secondary of the transformers to protect, it canbe fulminated by high intensity overvoltage .This happens when the locking of the master switch is connected without the charge.This is much more evident when the 220 Vac voltage is obtained directly from the bars ofthe secondary of the transformers and there is a fixed phase adjustment condenser of thesame transformer.In order to protect the electronic apparatus, we recommend the application of theelectronic discharges of the serie PT-73 - mono or double phase - which havebeen studied by Tecsystem Srl for this specific purpose.Alternatively, we recommend the application of a power supply by 24 Vac or better24 Vdc.4) ALARMS (3/3F/4F) AND FAN CONTROL ( 3F/4F) ELECTRICAL CONNECTIONSCarry out the electrical connections on the extractable terminal board after having takenthem off from the apparatus (follow the Fig.1).ALARM and TRIP relays energize only when the prefixed temperature limits are reached.The FAULT relay energizes when the apparatus is supplied and it de-energizes when thePt100 are damaged or when there is no power supply voltage.The FAN relay can be utilized for the cooling-fan control or else it can be inserted in a conditioningcircuit of the transformer box.5) THERMOMETRIC SENSORS CONNECTIONEach Pt100 sensor has three conductors : one white and two red (CEI 75.8)The Fig.1 shows the disposition in the terminal board of the connection cables to the unit.The CH2 channel must be always refired to the central column of the transformer.The CH4 channel must be always refired to the core of the transformer or else to the ambientPt100 sensor, if you want to keep the box of the transformer under thermic control bytheT- 935 unit.4 T-935-3-3F-4F protection relays

TECSYSTEM S.r.l ®6) MEASURE SIGNALS TRANSPORTAll the transport cables of the Pt100 measure signals must absolutely:• be divided from the power ones• be realized with shielded cable with twisted conductors• have a section of min 0,5 mm²• be twisted if you have no shield• be firmly fixed in the terminal board• have tinned or silvered conductorsAll the “T” series units have the sensors linearization with a max error of 1% v.f.s..TECSYSTEM srl has realised a special cable for the measure signal transportwith all the protection requirements according to CEI Norms: mod. CT-ES7) THERMOMETRIC SENSORS DIAGNOSTICIn case of damage of one of the thermometric sensors which are installed on the machineto protect, the FAULT relays energizes immediately, the ALARM and TRIP LED of thedamaged channel (Chn) lighten and the FAULT LED is lightening.The kind of sensor damage will appear automatically on the display. It can be:• Fcc if the sensor is in short circuit• Foc if the sensor is disconnected8) ALARM RELAY FOR DAMAGED SENSOR (Fcd)During the normal working of the unit, if you programmed Fcd/YES the display will signalby Fcd that a sensor is damaged and the LED which corresponds to the respective channelwill lighten (Chn).The FAULT relay energizes giving a signal to the operator.After the replacement of the damaged sensor, you can RESET the alarm pushing RESETuntil RST appears on the display .9) TEMPERATURES DIAGNOSTICWhen one of the thermometric sensors surveys a temperature which is superior to 1°C ofthe alarm limit, after 4 seconds the ALARM relay will energize and the ALARM LED of therespective channel (Chn) will switch on..We have the same situation when the TRIP temperature limit is surveyed: we have the energizingof the TRIP relay and the lighting of the LED TRIP of the respective channel(CHn).Then the surveyed temperature falls of 1°C in comparison with the prefixed limit for theALARM and TRIP switching, the relays de-energize and the respective LEDS switch off.T-935-3-3F-4F protection relays5

TECSYSTEM S.r.l ®10) COOLING-FAN CONTROL (on mod. 3F and 4F)The T-935 -3F/4F unit, if suitably programmed, can control the ON-OFF for the transformerfans on the ground of the established temperatures.The fans on the edge of the machine or those for air drifting can be controlled in two differtentways:• using the temperatures surveyed by the sensors on the three columns (on 3F and 4F)• the sensor CH4 is either located on the core of the transformer or it is excluded (formod. 4F)CHF 1.2.3ALARM and TRIP LED CH1.2.3 switched on (ex. ON at 80°C - OFF at 70°C)• by an additonal sensor (CH4/YES) for the ambient temperature in the box of thetransformer.CHF 4ALARM e TRIP LED Ch4 switched on (ex. ON at 40°C - OFF at 30°C)You can select it by UP and DOWN push-buttons.11) FAN TEST ( on mod. 3F and 4F)By programming (hxx) you can establish to have the fans set for 5 minutes every “xx”hours, independently on coils or ambient temperature values.This function has the purpose to verify periodically the fans working, when they are notutilized.Establishing h00 this functions is excluded.12) HOLD FUNCTIONIf you set up by programming HLD-YES, ALARM and TRIP relays will be energized untilthe manual reset which is possible only when the temperature falls down the alarmthresholds. If you do not want this function you have to establish HLD no by up and downpush-buttons.13) DISPLAY MODEPressing on DISPLAY MODE you establish the visualization ways of the display:• HOT : the unit visualizes automatically the hottest channel• MAN : manual reading of the channels temperature by UP and DOWNpush-buttons• T.MAX : the unit visualizes the max. temperature reached by the sensors andthe possible alarms starting from last reset.14) WORKING PROGRAM CONTROLIn order to control the programmed temperature values, you have to push shortly onPRG. By pushing PRG repeatedly the values previously established appear on the displayin sequence.In order to end the visualization you have to push ENT.6 T-935-3-3F-4F protection relays

TECSYSTEM S.r.l ®15) LAMP TESTIt is advisable to carry out regularly the LED test of the unit. For this operation you have topush TEST.If one of the LEDS does not work, please send us the unit in order to be repaired.16) ALARM RELAYS TESTThis function allows to test the relays working without any additional instrument and tocheck that the external wire connections are correct.To carry out the test you have to push TEST for 5 seconds: all the LED will switch on andtSt lightening will appear on the display.Release it when the RELAY TEST LED will be alight.The first relay to test will be indicated by the display and the respective LED will be alight.The relays to test will be indicated on the display by:• “Fan” : cooling relay (on mod. 3F and 4F)• “Flt” : Pt100 fault relay• “Alr” : alarm relay• “trP” : trip relaySelect the relay to test by UP and DOWN push-buttons. Energize it by pushing SET andde-energize it by pushing RESET.In order to stop this procedure, you have to push again TEST and all the relays will be restoredto the starting configuration.After 5 minutes of inactivity of the keyboard, the TEST RELAY procedure will be automaticallyinterrupted.17) ALARM RELAY EXCLUSIONIf you want to exclude the alarm signal, you have to push RESET: the relay de-energizesand the respective LED, which was alight, starts to lighten. If the transformer temperaturesis still rising, the ALARM relay will energize again until the temperature value falls down to5°C below TRIP threshold. In this moment the user can exclude the ALARM again, but inthis case, it will not appear any other indication as regards to ALARM relay.The exclusion system will be automatically disconnected when the temperature falls downthe ALARM threshold.18) IMPORTANT NOTICEBefore making the insulation test on the electrical panel on which the unit is installed,you must take it off from the power supply in order to keep it out of damage.T-935-3-3F-4F protection relays7

TECSYSTEM S.r.l ®19) PROGRAMMINGN°PUSH BUT-TONS1 PRG/SET2EFFECT NOTES 3 3F 4FKeep the push buttonpressed for 7’’ until Set appearsand PRG starts tolighten. When PRG stopslightening the set DEFAULTALARM temperature will appearon the displayEnter the desired Limit setpointfor Ch 1-2-3Led program allight ¤ ¤ ¤¤ ¤ ¤3 PRG/SET TRIP set T° appears ¤ ¤ ¤4Enter the desired Limit setpointfor Ch 1-2-3¤ ¤ ¤5 PRG/SET CH4 appears on the display ¤YES: Ch4 enabled6 Enter CH4 YES or NO¤NO: CH4 disabled7 PRG/SET ALARM set T° appears only if YES was chosen at step 6. ¤8Enter the desired Tripsetpoint for Ch 4¤9 PRG/SET TRIP set T° appears only if YES was chosen at step 6. ¤10Enter the desired Tripsetpoint for Ch 4¤11 PRG/SET “FAN” appears ¤ ¤12 set up FAN YES or NO13 PRG/SETStatus of FAN control will appearon the display as CHFYES:FAN connectedNO: FAN disconnectedonly if YES was chosenat steps 6 and 12.¤ ¤14 set up CH 1,2,3, or CH4 respective LED alight ¤15 PRG/SET on the display appears ON ¤ ¤16 PRG/SET the ON T° appears ¤ ¤17 set up the temperatureonly if at the step 12you established YES¤¤ ¤18 PRG/SET on the display appears OFF ¤ ¤19 PRG/SET the OFF T° appears ¤ ¤20 set up the temperatureonly if at the step 12you established YES¤ ¤21 PRG/SETway of FAN control TEST onthe display appears h00¤ ¤22 set up the number of hoursonly if at the step 6 youestablished YESh00=function disconnected¤ ¤23 PRG/SET on display appears Fcd ¤ ¤ ¤with Fcd YES= control of damagedPt10024 set up Fcd YES or no¤ ¤ ¤connected25 PRG/SET on display appears Hld ¤ ¤ ¤with HLd YES function HOLD established26 set up Hld YES or no¤ ¤ ¤27 PRG/SET Prg appears on display ¤ ¤ ¤Prg NO= the programming is28 set up Prg YES or NO¤ ¤ ¤blocked29 ENT out of the programming lamp test ¤ ¤ ¤30 PRG/SET return to step 1 ¤ ¤ ¤8 T-935-3-3F-4F protection relays

TECSYSTEM S.r.l ®20) PROGRAMMING REHABILITATION IN CASE OF BLOCK (Prg ! no)If the programming has been blocked (step 28), in order to enter again the programmingof the unit, it is necessary to carry out the following unblocking procedure :• enter the program vision way pushing PRG• keep TEST pushed until PRG stops to lighten and the set temperature value appearson the display. Follow the instruction at point 2 of the programming chart (pag.8).21) WARRANTYThe “T” series units are under warranty for 12 months from the delivery date indicated onthe unit.The warranty is recognised when the unit breaks down due to some production faults orinsufficient calibration.The warranty is not valid when the unit is tampered with or when it has been damaged fora wrong sensors connection or wrong power supply, out of the max working limits(20÷270 Vac-dc). The warranty is not valid when the unit has been fulminated by eccessivetransitory voltages. In this case TECSYSTEM Srl does not answer for damagescaused by faulted or defective units. All the delivery expenses (there and back) of the unitmust be payed by the Customer.(ANIMA prices, Col. C.).In case of dispute, the qualified FORUM is the one in Milan.The warranty is always EXW our Company in Corsico.22) PT100 EXTENSION CABLE: TECHNICAL SPECIFICATIONSCable 20xAWG 20/19 cu/stgSection 0,55 mm²Antiflame Insulation PVC105In accordance with CEI 20.35 IEC 332.1Max. working temperature: 105°CConformation : 4 terns of the numbered conductors (1-1-1.........4-4-4)RRW twisted and coloured conductorsShield cu/stgPVC Antiflame protecting coveringExternal diameter 9,0 mmSkeins of 100 mT-935-3-3F-4F protection relays9

TECSYSTEM S.r.l ®FAULT DIAGNOSTICThe unit doesn’t switch on even if there isvoltage to the terminalsThe CH4 is in FAULT FOC (Only three Pt100sensors are connected)One of the 3/4 channels is in FAULT forFOC/FCCDuring the main switch manoeuvre ON-OFF,the ALARM and TRIP relays energizeAll the Pt100 sensors are in FCC.The temperature indicated by 1 or morechannels is wrong.CAUSES AND REMEDIESConnector not well fit in its place.Connection wires not well closed in theclamp Burnt power supplier.Take away and give voltage again.Wrong programming of the unit.Repete the programming.Check the sensors Pt100 connection.Probable damaged sensor.Subsitute the damaged sensorStrong electrical noises on the power supplyline.Plug in the PT-73.Check if the shield of the signal transport cableis connected to the ground on the side ofthe panel.If you have no shielded cable, you have toput it. (Mod. CT-ES).If it is not available, twist the three connectingwires of the sensors.Wrong connection of the sensors. Upsidedownterminal board.Check the connections and the terminalboardContact Technical Dept. of TECSYSTEM S.r.l.Sudden release of the main switch with anormanl temperature level.A single channel caused the unhooking.Pt100 sensor defective (Fcd).Substitute the sensor.Check the measuresignal terminal board.Set “Fcd” function (see page 5). Should theFcd Fault signal appear on the display againchange the indicated sensor.10 T-935-3-3F-4F protection relays

TECSYSTEM S.r.l ®FIG.1ELECTRICAL CONNECTIONSPt100 SENSOR CONNECTIONCH 1 CH 2 CH 3 CH 413 14 15 16 17 18 19 20 21 22 23 24T 935-4FALARM AND FAN RELAYS CONNECTION1 2 3 4 5 6 7 8 9 10 11T 935-3F/4FALARM TRIP FAULT FANPt100424140POWER SUPPLY24-240 VAC-VDCWHITEREDREDT-935-3-3F-4F protection relays11

TECSYSTEM S.r.l ®T935-3-3F-4F TEST DESCRIPTIONThe unit was submitted to the following tests during production:N° Description1 PC board test2 Input test3 Test of relay contacts and outputs4 Key test5 Lamp test6 Calibration at 100 and 200°C (for temperature monitoring units)7 Software test8 Burn-in minimum 24hDate of shipment:12 T-935-3-3F-4F protection relays