GTT 25A - 40A - 60A - 90A - 120A POWER SOLID STATE RELAYS WITH ANALOG CONTROL

Transcription

1 GTT 25A - 40A - 60A - 90A - 120A POWER SOLID STATE RELAYS WITH ANALOG CONTROL Main applications Plastics extrusion lines and injection moulding machines Polymerization plant for synthetic fibre production Rubber moulding machinery Driers for ceramics and components for the building industries Chemical and pharmaceutical industries Industrial ovens and furnaces Food processing plants Main features Command input from analogue voltage or current signal or potentiometer. Zero crossing switching. Wave packets power partialisation with dinamically optimised cycle time. Antiparallel double SCR 2 led for supply indication, ON state, 1 optional led for HB alarm Galvanic separation between control buffer and power circuits (4000V) Overheating indicator MOV (varistor) Optional monitoring of interrupted load Panel mounting (standard); DIN rail mounting (optional) GENERAL The GTT family of solid-state relays has been designed with the aim of providing very accurate control of the load from an analogue input signal (0-10V or 0-20/4-20mA) or a potentiometer (from 1kΩ to 10kΩ). The electronic design ensures that the cycle time for proportioning the power is automatically optimized. The number of cycles that the GTT supplies to the load (fast cycling) for a given input signal is calculated to be the minimum possible to maintain the necessary accuracy. This guarantees a very fast and accurate control loop that enables the GTT, driven by a controller or a PLC with analogue output, to obtain very precise control. The GTT can be uses in three phase systems, using master-slave control architecture in which the control signal drives only one GTT (master) and this unit supplies the synchronized signals to the other units (slaves). Optional monitoring for an interrupted load can be provided (HB). This accepts a 500mAac input from a current transformer. The trip point is adjustable with trimpots and there is LED indication and a normally open voltage free relay contact output. The GTT solid-state relay has a green LED to indicate the presence of the 24Vac power supply and a red LED to indicate the switching state as a function of the input signal. This LED will be continuously off for zero power and fully on at maximum and will flash at all intermediate values. The units offer optional DIN rail mounting, overtemperature indication (for temperatures > C), fuses and fuseholders. TECHNICAL DATA General features Nominal voltage - 400Vac (max. range Vac) - 480Vac (max. range Vac) Nominal frequency: 50/60Hz Non-repetitive voltage: 1000Vp Zero switching voltage: 20V Voltage drop at nominal current: 1,6Vrms Power factor: ³ 0,5@400Vac rms Inputs Voltage: Vdc (R 100KΩ) Current: mA, mA (R 500Ω) Potentiometer: from 1K to 10KΩ (auto-fed by GTT) OUTPUTS GTT (25) Nominal current: 25 A@40 C Non-repetitive overcurrent t=20 ms: 400A I 2 t for fusing: 800A 2 s Critical dv/dt OFF-state: 1000V/µs

2 GTT (40) Nominal current: 40 C Non-repetitive overcurrent t=20 ms: 400A I 2 t for fusing: 800A 2 s Critical dv/dt OFF-state: 1000 V/µs GTT (60) Nominal current: 60 A@ 40 C Non-repetitive overcurrent t=20 ms:1300a I 2 t for fusing: 8500A 2 s Critical dv/dt OFF-state: 1000 V/µs GTT (90) Nominal current: 90A@ 40 C Non-repetitive overcurrent t=20 ms:1700a I 2 t for fusing: 15900A 2 s Critical dv/dt OFF-state: 1000 V/µs GTT (120) Nominal current: 120A@ 40 C (Thermostat and fans serie) Non-repetitive overcurrent t=20 ms:1700a I 2 t for fusing: 15900A 2 s Critical dv/dt OFF-state: 1000V/µS Insulation Nominal insulation voltage input/output: 4000V Operating temperature: from 0 to 80 C (see dissipation curves ). Power Supply: 24Vac ±10%, 50/60 Hz Assorbimento: 90 marms Options: Interrupted load alarm. This requires a 50mA input from the secondary of a current transformer (CT). The trip level is set using a multiturn trimmer without removing the cover. The alarm output activates a voltage free, normally open, relay contact (max. 30V-1A). Application notes In order to obtain best reliability, it is important to install a heatsink correctly inside the panel, to reach an adequate thermal exchange between the device and the surrounding air in natural convection conditions. Mount it vertically (max. 10 dinclination from the vertical axis) Vertical distance between two heatsinks >200mm Horizontal distance between two heatsinks >20mm Main use limits Dissipation of thermic power on the relay with restraints on the ambient temperature of the installation. Equip the cabinet with an external air change or air-condition it, to put out dissipated power. Installation restraints (distances to be respected to grant dissipation with natural convection) Line transistor max. voltage and derivative limits, for which the solid state relay is equipped with inside safety devices. Leakage current (about 2mA) caused by thyristor, about 20mA for RC filter TIPOLOGY OF THE FUNCTIONING Zero crossing with variable cycle time Examples of the operation of the GTT for different values of the input drive signal and the consequent different cycle times (100msec and 40msec respectively) V Example of input at 20% = 2V (IN 0-10V) or 4mA (IN 0-20mA) V=Voltage across load V Example of input at 50% = 5V (IN 0-10V) or 10mA (IN 0-20mA) V=Voltage across load

3 FACEPLATE DESCRIPTION Control terminals (V,mA, potentiometer) Supply terminals 24Vac ±10% 50/60Hz C.T. input (50mA) Output of the contact relay alarm (max 30V-1A) Jumper J1 (present under the cover) for to sort ma input (jumper closed) Minimum and maximum trimpots screw for input signal calibration Master/Slave connection output Alarm Set calibration trimpot screw LED indication of power supply LED indication of power on Current and voltage label LED alarm Serial Number Ground terminal Power terminals Detail of the terminal board 1 9 CALIBRATION PROCEDURE OF THE INPUT SIGNAL GTT The solid-state power unit, GTT, is supplied factory calibrated for V, mA and 10 KΩ. Other calibrations can be achieved within these ranges by using the MIN and MAX trimmers. Before shipment, the unit is preset for an input of mA (jumper J1 closed). Calibration procedure for an input of 4-20mA: (refer to the faceplate description drawing): 1) Ensure that jumper J1 is closed. 2) Inject a drive signal in series with a milliammeter (or use a calibrator) and adjust the signal level to read 4mA (madc range. 3) Check that the ON LED is flashing slowly. 4) Turn the MIN trimmer clockwise until its end stop (a light click can be felt). 5) Turn the MIN trimmer anticlockwise for 10 turns. 6) Turn the MAX trimmer slowly anticlockwise until the ON LED turns off. 7) Turn the drive signal up until it reaches 19mA. 8) Trim the MAX trimmer until the ON LED is almost always illuminated. (The ON LED will flash off for very short instants). 9) Repeat item 2) and adjust the MIN trimmer until the ON LED is always off. 10) Increase the drive signal to 20mA. 11) Ensure that the ON LED is alwys on (if necessary, adjust the MAX trimmer slightly).

4 CALIBRATION PROCEDURE OF THE INTERRUPTED LOAD ALARM The interrupted load alarm function enables the GTT to diagnose a variation of the load current (even during partialisation) so that it will indicate any malfunction of the load resistance. The alarm activates (relay closed and alarm LED on) when the current, during the conduction of the device, falls below a preset level that may be adjusted using the trimmer on the faceplate. Calibration procedure (refer to the faceplate description drawing): 1) Turn the drive signal up to the maximum signal (100% conduction or the ON LED always illuminate) 2) Use a clip-on ammeter to check that the current is correct for the nominal resistance of the load. 3) Turn the AL-SET trimmer fully clockwise as far as its end stop (a light click can be felt) and ensure that the alarm LED AL is on. 4) Turn the AL-SET trimmer slowly anticlockwise until the AL LED turns off. Turn the trimmer a further full turn anticlockwise. 5) In this way, the alarm level is preset 10% under the nominal load current. Note: For partilisation at less than 20%, the sensitivity of the alarm is reduced due to the reduced conduction time of the device. DE-RATING CURVES Curves showing the nominal current as a function of the temperature and of the duty cicle of the drive signal (duty cicle = (conduction time x 100)/ cycle time) of the control (control ouptut percentage requested by the system). Legend: = duty cicle 100% = duty cicle 50% = duty cicle 25% THERMAL DUTY: Pds = 1.6 x Irms (W) Irms = Nominal current of the single-phase load TABLE FOR TERMINAL CHOICE OF POWER TERMINAL BOARD Size Ø terminal eyelet Suggested conductor section 25A 40A 60A 90A 120A 3mm 5mm 5mm 5mm 5mm 6mm 2 10mm 2 16mm 2 25mm 2 35mm 2

5 DIMENSIONS AND CUT-OUT GTT 25- GTT 40 GTT 60 GTT 90 (without fan) GTT 120 (with fan) mm (max) depth = 112mm (*) weight = 800g (*) with DIN rail mounting add. 15mm. depth = 132mm (*) weight = 1100g depth = 136mm (*) weight GTT 90 = 1300g weight GTT 120 = 1800g CONNECTION DIAGRAM Single-phase connection with optional monitoring of interrupted load (command input from analog signal or potentiometer) Relay output - Alarm (ON closed) Potentiometer + - Analog output 0-20mA 4-20mA 0-10V 480 Controller Load (Accessories FUS-040) Transformer 230/24Vac (Accessories TRAFO 1) Phase Neutral Ground

6 CONNECTION DIAGRAM Star or delta three-phase without neutral, with interruption of two phases, and optional monitoring of interrupted load Relay output - Alarm (ON closed) Potentiometer + - Analog output 0-20mA 4-20mA 0-10V Controller Three-phase delta system Three-phase star system (Accessories FUS-040) (Accessories FUS-040) Transformer 230/24Vac (Accessories TRAFO 5) 220Vac Phase R Phase S Phase T Ground Three-phase star connection with neutral, with optional monitoring of interrupted load Relay output - Alarm (ON closed) Potentiometer + - Analog output 0-20mA 4-20mA 0-10V Controller Load (Accessories FUS-040) (Accessories FUS-040) (Acces. FUS-040) Transformer 230/24Vac (Accessories: TRAFO 5) Neutral Phase R Phase S Phase T Ground

7 ACCESSORIES Extrarapid fuses Model GTT Order code (fuse) - GTT (25) FUS-030 (14x51mm) - GTT (40) FUS-040 (14x51mm) - GTT (60) FUS-080 (22x58mm) - GTT (90) FUS-100 (22x58mm) - GTT (120) FUS-125N (100x51x30mm) holder Order code (fuse holder) - PF - 14x51 (for FUS-030 and FUS-040) - PF - 22x58 (for FUS-080 and FUS-100) - PF - DIN (for FUS-125N) DIN rail mounting Order code - DIN-3 Supply and isolation transformer TRAFO - 1 TRAFO - 1B TRAFO - 5 TRAFO - 5B Transformer for galvanic isolation of the supply GTT. Dimensions TRAFO - 1 / TRAFO - 1B L: 58mm B: 47mm H: 36mm Dimensions TRAFO - 5 / TRAFO - 5B L: 67mm B: 52mm H: 45mm Order cdoe TRAFO - 1: 3VA, 230/24Vac transformer TRAFO - 1B: 3VA, 24/24Vac transformer TRAFO - 5: 10VA, 230/24Vac transformer TRAFO - 5B: 10VA, 24/24Vac transformer / 0.05 A ,5 27 5, These transformers are used for current measurements at 50 60Hz. The peculiar characteristics of these transformers is the high number of secondary turns. This means a very low secondary current directly suitable for an electronic circuit of measurement. The secondary current may be detected as a voltage on a resistor In Order code IN = 50Aac OUT = 50mAac IN = 25Aac OUT = 50mAac Hole for 2,9 x 9 screws

8 ORDER CODE GTT / - Model GTT Nominal current 25Aac 40Aac 60Aac 90Aac 120Aac (*) (*) Specify fan supply: 115Vac or 230Vac Nominal voltage 400Vac Vac 480 HB Alarm option Without option With HB Alarm option 0 1 WARNINGS! WARNING: this symbol indicates danger. Before installation, please read the following advices: follow the indications of the manual scrupulously when making the connections to the instrument. use a cable that is suitable for the ratings of voltage and current indicated in the technical specifications. if the instrument is used in applications where there is risk of injury to persons and damage to machines or materials, it is essential that it is used with an auxiliary alarm device. It is advisable to verify frequently that the alarm device is functional even during the normal operation of the equipment. The instrument must NOT be used in environments where there could be the presence of dangerous atmospheres (inflammable or explosive). 100 C degrees can be reached by the heatsink when working continuously: contact with people or electrical cables are about ventilation and air-conditioning systems. do not operate on the power circuit untless the main supply is disconnected. DO NOT open the cover if device is ON! (use the holes in the cover for eventual re-calibration). Installation: connect the device to the ground using the proper ground terminal. the power supply wiring must be kept separate from that of inputs and outputs of the instrument; always check that the supply voltage corresponds to that indicated on the instrument cover. keep away from dust, humidity, corrosive gases and heat sources. please follow installation distances advice (in order to allow generated heat dissipation). periodically check the state of cooling fans and clean the ventilation filters. GEFRAN spa reserves the right to make any kind of design or functional modification at any moment without prior notice N.B.: This data sheet should be used as user manual In conformity to ECC 89/336/CEE and 73/23/CEE with reference to standards: - EN (immunity in industrial enviroment)- EN (emission in residential enviroment) - EN (safety) GEFRAN spa via Sebina, Provaglio d Iseo (BS) Tel fax Internet: cod /00