Protection components
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1 General Application LT3-Si thermistor protection units continuously monitor the temperature of the machines to be protected (motors, generators, etc.) by means of PTC thermistor probes embedded in the machine windings. If the nominal operating temperature of the probes is reached, they convert the rapid increase in resistance into a switching function which can be used to switch off the machine or signal a fault (see paragraph relating to thermistor probes below). Accidental breaks in the supply circuits of the thermistors are also detected. Electromagnetic compatibility Electromagnetic compatibility to EN Resistance to electrostatic discharge (conforming to IEC/EN ) Level 3 Resistance to fast transients (conforming to IEC/EN ) Level 3 Susceptibility to electromagnetic fields (conforming to IEC/EN ) Level 3 Surge resistance 1./50-8/0 (conforming to IEC/EN ) Level 4 Immunity to microbreaks and voltage drops (IEC/EN ) Suitable for use with variable speed controllers Thermistor probes Range of most commonly used PTC thermistor probes: from 90 to 160 C, in steps of 10 C. Curve R = f (θ), characteristic of a PTC thermistor probe is defined by standard IEC/EN The choice of PTC thermistor probe to be incorporated in the motor winding depends on the insulation class, the type of motor and the most suitable location for the probe. This choice is usually made by the motor manufacturer or the motor rewinder, who have all the necessary information Application example Insulation class NOT Temperature at which rapid of rotating machines Nominal increase in resistance occurs conforming to IEC/EN operating Probes used for (S1 duty) temperature Alarm C C C A B E F H References: Dimensions: Schemes: pages /56 and /57 page /58 pages /58 and /59 /5
2 Characteristics Type LT3-SE LT3-SA LT3-SM method Automatic Automatic Manual/Automatic indication On front face On front face of unit of unit and remote and remote test By pushbutton on front face of unit Interchangeability Label Mark A Label Mark A Label Mark A to IEC to IEC to IEC Environment Conforming to standards IEC IEC IEC VDE 0660 VDE 0660 VDE 0660 Approvals CSA, UL (pending) CSA, UL, PTB, RINA, BV, GL, DNV, LROS (pending) Degree of protection IP 0 conforming to IEC/EN 6059, VDE 0106 è marking LT3-Si protection units have been designed to comply with the essential recommendations of European directives relating to low voltage and EMC. Therefore, LT3-Si products bear the European Community è mark. Ambient air temperature Storage C around the device To IEC/EN and Operation C Maximum operating altitude Without derating m 1500 With derating Up to 3000 m, the maximum permissible ambient air temperature for operation (60 C) must be reduced by 5 C per additional 500 m above 1500 m Vibration resistance Conforming to IEC/EN gn ( 5 Hz) 1 gn (5 150 Hz) Shock resistance Conforming to IEC/EN gn (11 ms) Operating positions In relation to normal Any without derating vertical mounting position Power supply circuit characteristics Rated control circuit c 50/60 Hz Single voltage V 115 or voltage (Uc) Uc Dual voltage 115/30 115/30, 4/48 c 50/60 Hz Multi-voltage V Uc a Single voltage V Uc Dual voltage 4/48 4/ Uc Multi-voltage V Average consumption Sealed c VA <.5 <.5 <.5 (except 400V:.7) References: Dimensions: Schemes: pages /56 and /57 page /58 pages /58 and /59 a W < 1 < 1 < 1 /53
3 Characteristics (continued) Control circuit characteristics Type LT3-SE LT3-SA LT3-SM Resistance Tripping Ω Ω Maximum number of probes Probes 50 Ω to fitted in series Voltage at terminals in Normal operation V <.5 <.5 <.5 the thermistor circuit (R=1500Ω) Conforming to IEC/EN (R=4000Ω) V < 7.5 < 7.5 < 7.5 Short-circuit detection Operating threshold Ω < 0 < 0 Connection of probes to the LT3 Distance m () Electrical characteristics of the output relay contacts Minimum c.s.a. of conductors mm Contact type Single voltage or dual voltage 1 N/C 1 N/C + 1 N/O 1 N/C + 1 N/O Multi-voltage C/O C/O Rated insulation voltage V c 500 Maximum operational voltage V c 50 (c 400 V for LT3-SM00V) Rated impulse withstand voltage U imp kv.5 Conventional thermal current A 5 Operational power At 0 V VA 100 for 0.5 million operating cycles Breaking capacity in AC V A 6 50 V A 3 in DC-13 4 V A Cabling (cage type connector) Without cable end mm x x.5 for flexible or solid cable With cable end mm 1 x x. Tightening torque N.m 0.8 Thermistor probe characteristics Type D-TTiii D-TSiii Conforming to standards IEC/EN Mark A Resistance At 5 C Ω 3 x 50 in series 50 Rated operational voltage () Per probe V a.5 V max a.5 V max Rated insulation voltage (Ui) kv.5 1 Insulation Reinforced Reinforced Length of connecting cables Between probes mm 50 /54 Between probes and m 1 1 motor terminal plate Provided that the total resistance of the probe circuit is less than 1500 Ω at 0 C. () For distances greater than 500 m take cabling precautions (twisted shielded pairs). References: Dimensions: Schemes: pages /56 and /57 page /58 pages /58 and /59
4 Characteristics LT3-S protection unit/thermistor probe combination Guaranteed operating zones: examples with 3 probes type D-TTiii (50 Ω to 5 C) in series, conforming to IEC/EN , mark A. LT3-SE, LT3-SA, LT3-SM protection units Resistance (ohms) Trip zone zone Trip zone on probe short-circuit -0 0 NOT - 0 C NOT - 5 C TNF NOT + 5 C NOT + 15 C Temperature ( C) 1 3 probes type D-TTiii (50 Ω at 5 C) in series NOT: Nominal operating temperature Protection unit tripped Protection unit set References: Dimensions: Schemes: pages /56 and /57 page /58 pages /58 and /59 /55
5 References Protection units (without fault memory) Units with automatic reset with thermistor short-circuit detection Connection Voltage Output Reference Weight contact kg Cage connectors c 115 V N/C LT3-SE00F /60 Hz 30 V N/C LT3-SE00M 0.0 a 4 V N/C LT3-SE00BD 0.0 LT3-SE00M Units with automatic reset with thermistor short-circuit detection On front face: fault and voltage signalling indicator. Connection Voltage Output Reference Weight contact kg Cage connectors c 115/30 V N/C + N/O LT3-SA00M /60 Hz a 4/48 V N/C + N/O LT3-SA00ED 0.0 c 50/60 Hz 4 30 V C/O LT3-SA00MW 0.0 or a LT3-SA00M Protection units (with fault memory) Units with manual reset with thermistor short-circuit detection. On front face: - fault and voltage signalling LED, - Test and button. Connection Voltage Output Reference Weight contact kg Cage connectors c 400 V N/C + N/O LT3-SM00V /60 Hz 4/48 V N/C + N/O LT3-SM00E 0.0 LT3-SM00M 115/30 V N/C + N/O LT3-SM00M 0.0 a 4/48 V N/C + N/O LT3-SM00ED 0.0 c 50/60 Hz 4 30 V C/O LT3-SM00MW 0.0 or a Characteristics: Dimensions: Schemes: pages /5 to /55 page /58 pages /58 and /59 /56
6 References PTC thermistor probes Description Nominal Sold Unit Weight operating in reference temperature lots of (NOT) C kg Integrated triple probes D-TT D-T D-T D-T D-T D-TTiii D-T D-T D-T Surface probes D-TS D-TS D-TS D-TS D-TS Accessories (to be ordered separately) D-TSiii Mounting accessories Description Application Sold in Unit Weight lots of reference kg Adaptor For fixing on 10 RHZ ' rail DZ5-MB Marking accessories Clip-in markers Strips of 10 identical 5 AB1-Ri 0.00 (maximum of 5 per numbers (0 to 9) device) Strips of 10 identical 5 AB1-Gi 0.00 capital letters (A to Z) Replace the i in the reference with the required number or letter. Characteristics: Dimensions: Schemes: pages /5 to /55 page /58 pages /58 and /59 /57
7 Dimensions, schemes, setting-up Dimensions LT3-SE, SA, SM Mounting on rail AM1-DP Mounting on one ' rail (with mounting plate RHZ-66) ,4 100,5 50 RHZ-66 Schemes for no fault operation LT3-SE LT3-SA dual voltage LT3-SA multi-voltage Without fault memory ou B1 05 T T 97 T A A A H H LT3-SM dual voltage LT3-SM multi-voltage LT3-Si dual voltage and 400 V (without B1) T Y1 Y ou B1 Test A 97 T Y1 Test Y A Note: Dual voltage units Supply must be connected as follows: Lower of the two specified voltages -B1 + A Higher of the two specified voltages - + A H H 1) Contacts shown with relay energised Setting-up Cabling It is inadvisable to use the same multi-core cable for the thermistor probe circuit and the power circuit. This is especially important for long cable runs. If it is impossible to comply with the above recommendation, a pair of twisted conductors must be used for the thermistor probe circuit. Testing the insulation of the line connecting the thermistors to the LT3-S unit Before carrying out this test, short-circuit all the terminals of the LT3-S protection unit. Measure the insulation value between these terminals and earth using a megger or a flash tester, progressively increasing the voltage to the value defined by the standards. Checking the PTC thermistor probes for correct operation With the machine stopped, in the cold state and after having taken all the necessary safety precautions: i disconnect the line linking the thermistors to the LT3-S protection unit, at the terminals of the machine being protected: motor, etc., i using an ohmmeter with a voltage rating less than or equal to.5 V, measure the resistance of the probe circuit at the machine terminals, i depending on the number and type of thermistors connected in series, check that their resistance value at 5 C is correct. Example: motor fitted with 3 PTC thermistor probes with a resistance 50 Ω at 5 C. Any value higher than 50 x 3 = 750 Ω indicates a problem. Characteristics: References: pages /5 to /55 pages /56 and /57 /58
8 Operation LT3-SA protection units L1 L L3 N or B1 ing The LT3-SA is normally energised and its internal relay is in the pre-energised position. The motor is started by operating pushbutton automatically held in by K (3-wire control circuit). T A o 97 H Thermal fault The strong increase in resistance of the PTC probes at the moment their temperature reaches the nominal operating temperature (NOT) is detected by the LT3-SA unit and causes the relay to drop out; indicator H comes on, as does the built-in indicator on unit LT3-SA. Contactor K drops out and pressing button has no effect. NOT, Tripping threshold threshold Operating temperature As the motor cools, it reaches the reset threshold, to 3 C below the nominal operating temperature. The relay resets and the motor can be started by pressing button Relay Ko indicator Contactor K Pushbutton M LT3-SM protection units L1 L L3 N T R1 or B1 o 97 Operation is very similar to that described above, except for the following: After tripping on thermal fault and cooling to the reset threshold, the Test/RESET button on the unit (R1) or a remote reset button () must be pressed to energise the relay. A H The fault is therefore memorised, even though the temperature of the probes has dropped to well below the reset threshold. Signalling circuit As the relay is fitted with separate contacts, the signalling voltage may be different from the contactor control voltage. NOT, Tripping threshold threshold Test/RESET button Operating temperature Test Pressing the Test/RESET button simulates a fault and causes the relay to drop out: the FAULT indicator comes on, as does the remote signalling indicator. The unit is reset by pressing the Test/RESET button again. Rd Relay Ko indicator Contactor K Pushbutton M Characteristics: References: Dimensions: pages /5 to /55 pages /56 and /57 page /58 /59
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