LT6 Protection and Intelligence Combined
Contents
1. ENS x 95 e pup ae tices Ud aaa SER 95 Canal KM2 KM1 ajajaja Channel Reserved ae 4 A Reserved 96 18 Discrete input E y E Motor Discrete input E i stop E 7 17 Discrete input D Oi Discrete input D T Ch l O1 Forward EA KM Y Reverse EA KM2 16 Discrete input C us KM1 KM2 4 Channel start start d Discrete input C B 02 O2 Motor 15 Stop channels A and B r Stop channels A and B er KM1 stop j Reverse _ 1 14 Start channel B 97 Start channel B Fault 37 KM1 KM2 start si Pe daa I Forward 13_ Start channel A g 9 98 Start channel A 98 start LL jg Local or serial communication Local or serial communication control of A and B 93 control of A andB 93 H Reset Alarm Reset Alarm 94 94 C1 Common 1 Common 1 1ko 1kQ C2 Common 2 Ti Common 2 T1 4 PTC probes T2 PTC probes 12 A2 NC NC Earth fault H1 Earth fault H1 A1 toroid H2 toroid H2 1 SESE 271 L11 L15 211 312 4 3L2 L21 L25 4T2 3L2 L21 L25 4T2 53 5L3 L31 L35 6T3 BEg4531 32. gt 7 Discrete input D ror 4 Mt Me Discrete input C Channel B Motor stop 02 Stop channels A and B ub TC Start channel B pank au Motor start x Start channel A signalling Lu 2 Local or serial communication T A control of A and B Reset Alarm Overload Local C L94 f e EE Common 1 __ Common 2 PTC probes Control 4 supply Earth fault 1 9 toroid 1L1 om 111 111 115 3L2 4 o 312 121 125 O Oo 53 L3x1i35 W 1 For DC control supplies the inputs 11 to 18 must be connected to the positive line 2 Disconnecting means and short circuit protection must comply with the National Electrical Code and local codes 3 Local maintained stop must be connected when serial link is used without local stop push button D SQUARE D 17 LT6 Multifunction Protection Relays Application Diagrams Motor control full voltage reversing starting Control via front face of relay Channels A and B set for reversing control Control via discrete inputs of relay Channels A and B set for reversing control
3. Resistance At 25 C Q 3 x 250 in series Rated operational voltage Ue Per probe V 2 5 VDC max Rated insulation voltage Ui kV 2 5 Insulation Reinforced Cable lengths Between probes mm 250 in 10 Between probe and motor m 1 terminal block ft 3 Guaranteed operating zones examples with 3 probes type DA1 TT 250 Q at 25 C connected in series conforming to IEC 34 11 mark A Resistance ohms Trip zone 100 20 10 o Z I i o Zz SQUARE D Reset zone Trip zone on short circuit probes Temperature C 1 3 probes type DA1 TT 250 Q at 25 C in series NOT nominal operating temperature Hy Trip control device Reset control device LT6 Multifunction Protection Relays Tripping Curves Cold state curves 1 t s 10000 1000 100 Class 30 Class 25 Class 20 10 Class 15 Class 10 Class 5 10 A 1 Wr 1 1 12 1 5 2 3 4 5 6 7 8 1 Tripping time accuracy 8 to 7 2 x Ilr 10 __1 SQUARE D LT6 Multifunction Protection Relays Tripping Curves Hot state curves 1 t s 10000 1000 100 10 Class 30 Class 25 Class 20 Class 15 Class 10 Cl
4. LT6 Protection and Intelligence Combined File 9110 CONTENTS Motor ProtectiOli iere iro ert a e aceisuacetenecticsacthcaheaiueusi cea ce REE FUNCIONS 2 conici cierre iv cit Characteristics Tripping Curves Catalog Numbers Mounting Dimensions 5 Application Diagrams 16 21 GOSS A ats 22 SQUARE D GROUPE SCHNEIDER LT6 Multifunction Protection Relays Motor Protection Operating conditions There are many possible causes of electric motor failure One of the most common and which is often accidental is the utilization of motors beyond the operating limits defined by the manufacturer or in abnormal ambient conditions A statistical survey covering 9000 incidents of motor failure gave the following results Overloads 1 30 96 Operating conditions example corrosive atmosphere 19 96 Phase failure 14 Bearing failure 13 Aging example ambient temperature too high 1 10 Rotor faults 5 Miscellaneous 9 These faults are related to motors with a power rating of 37 kW 50 hp or more 1 An examination of the above results shows that in more than 40 of cases the fault is due to the effects of heating Leaving aside the replacement of wearing parts such as bearings slip rings brushes etc the life of an electric motor is linked to that of its insulation Provided that th
5. Conforming to IEC 68 2 27 15 gn 11 milliseconds Vibration resistance Conforming to IEC 68 2 6 2 gn 3 to 100 Hz Ambient air temperature Storage C 35 to 85 around the device eE 91 to 185 Operation C 20 to 70 F 4 to 158 Flame resistance Conforming to UL 94 VO Maximum operating altitude m 2000 ft 6562 Operating position In relation to normal gane Li vertical mounting plane eon g E LS ROD F Resistance to Conforming to IEC 1000 4 2 level3 kV 8 electrostatic discharge Resistance to Conforming to IEC 1000 4 3 level3 V m 10 electromagnetic interference Resistance to Conforming to IEC 1000 4 4 level 4 kV 2 fast transient currents Resistance to conducted Conforming to IEC 1000 4 6 level 3 radio frequency disturbances Rated undissipated Conforming to IEC 947 1 kV 6 pulse withstand U imp Rated dissipated pulse withstand Conforming to IEC 1000 4 5 level 3 Resistance to low frequency disturbances supply harmonics Conforming to IEC 947 2 Appendix F Clause F4 1 Resistance to micro breaks Conforming to IEC 1000 4 11 1 1 Only applicable when power cabling to relay exceeds the following sizes 5 mm 16 AWG fitted with cable end or 2 5 mm 14 AWG not fitted with cable end SQUARE D LT6 Multifunction Protection Relays Power circuit characteristics terminals L11 L21 L31 L15 L
6. measurement by resistance C F 80 176 100 212 125 257 Commutators and slip rings C F 80 176 90 194 1 100 212 1 Bearings C F 60 140 60 140 2 60 140 2 When a motor is used at an ambient air temperature other than the normal value its temperature rise limit should be modified in order to maintain the same maximum temperature limit The result is that the motor operational power is no longer the same as its rated power Also the altitude of the installation if this is above 1000 m 3281 ft affects the cooling and increases the temperature rise The following table gives the ratio between operational power and rated power according to the operating conditions for a given ambient temperature It corresponds to insulation class B Operational power Rated power in watts Altitude Ambient air temperature AT 30 C 35 C 40 C 45 C 50 C 55 C 60 C m ft 86 F 95 F 104 F 113 F 122 F 131 F 140 F 1000 3281 1 07 1 04 1 00 0 96 0 92 0 87 0 82 1500 4922 1 04 1 01 0 97 0 93 0 89 0 84 0 79 2000 6562 1 01 0 98 0 94 0 90 0 86 0 82 0 77 2500 8203 0 97 0 95 0 91 0 87 0 84 0 79 0 75 3000 9843 0 93 0 91 0 87 0 84 0 80 0 76 0 71 3500 11 484 0 89 0 86 0 83 0 80 0 76 0 72 0 68 4000 13 124 0 83 0 81 0 78 0 75 0 72 0 68 0 64 The values shown in the above table are for guidance only In effect the derating of a motor depends on its size i
7. probes T2 m Control Control NC supply supply Earth fault H1 1 1 toroid H2 2 2 1L1 1L1 aT 312 3L2 L21 L25 32 4 T2 53 4 5L3 L31 L35 5 3 4 5L8 L31 L35 0 LLL 613 Control via serial link communication UNI TELWAY Jbus Modbus Maintained stop 3 Reserved _ __ L L L Discrete input E Discrete input D Discrete input C Channel B Stop channels A and B Start channel B Start channel A Local or serial communication control of A and B Reset Alarm Common 1 Common 2 1L1 3L2 5L3 1 For DC control supplies inputs 11 to IB must be connected to the positive line 2 Disconnecting means and short circuit protection must comply with National Electrical Code and local codes 3 Local maintained stop must be connected when serial link is used without local stop push button 16 SQUARE D LT6 Multifunction Protection Relays Application Diagrams Motor control full voltage non reversing starting Control via serial link communication with signalling earth fault toroid PTC probes state of power components Channels A and B set for reversing or independent control Possible to control the motor via discrete input local position or by serial link communication Maintained stop 3 RISE Ia E Tre ana N Channel KM1 LA Reserved A 96 Discrete input E Q1
8. 126 40 PA50 109 66 50 87 45 60 MA120 26 5 44 164 80 55 120 190 35 65 166 40 SA200 29 46 256 120 90 196 274 37 104 254 60 14 SQUARE D GA300 LT6 Multifunction Protection Relays 13 54 in 344 mm Mounting Dimensions pum 11 77 in 1 14 in 299 mm 29 mm POA GOA EN L 2 G e Dimensions in millimeters b Type c G POA 148 46 57 GOA 224 110 76 SQUARE D 15 LT6 Multifunction Protection Relays Application Diagrams Motor control full voltage non reversing starting channels A and B set for reversing or independent control Control from front face of relay Control via discrete inputs of relay KM1 M Motor ead D beet start alalel G 95 als ala kt oh IE Ala E Channel ET Reserved mm Reserved A rar Discrete input E Discrete input E L L l Discrete input D Discrete input D oi L s 01 Discrete input C Channel B Motor Discrete input C Channel B v i ae o2 Stop channels A and B Stop channels A and B L m Start channel B Start channel B Gaut 97 Start channel A Start channel A signalling og Local or serial communication Local or serial communication control of A and B control of A and B kes Alarm 94 Common 1 Common 1 C 2 1kQ ommon 2 T1 Common 2 PTC probes PTC
9. 25 L35 2T1 4T2 6T3 Characteristics Relay type LT6 POMOOSFM LT6 POM025FM Operating voltage range V 110 to 600 VAC 110 to 600 VAC Rated insulation voltage Ui Conforming to IEC 947 1 V 690 VAC 690 VAC Operating frequency Hz 50 60 1 50 60 1 Rated operational current A 0 2 to 5 2 5 to 25 Cabling Solid cable 1 or 2 conductors mm 1 5to6 AWG 16 to 10 Stranded cable w out cable end 1 or 2 conductors mm 1 5 to6 AWG 16 to 10 Stranded cable with cable end 1 or 2 conductors mm 1 5to4 AWG 16 to 12 Terminal tightening torque N m 1 7 Ib in 15 Short circuit protection By circuit breaker Select in accordance with Select in accordance with National Electrical Code National Electrical Code By fuses lt 1A RK5 4 Amp max 1to5A RK5 20 Amp max 25A Max 400 of motor FLA Max 400 96 of motor FLA Control circuit supply characteristics terminals A1 A2 Rated insulation voltage Ui Conforming to IEC 947 1 V 380 VAC Operating voltage V 90 to 276 VDC 90 to 276 VDC 50 60 Hz Cabling Plug in connector Solid cable 1 or 2 conductors mm 0 5to 1 AWG 120 to 18 Stranded cable w out cable end 1 or 2 conductors mm 0 5 to 1 AWG 20 to 18 Stranded cable with cable end 1 conductor mm 0 5to 1 AWG 120 to 18 2 conductors mm 0 5 to 0 75 AWG 20 Terminal tightening torque N m 0 7 Ib in 6 5 Discrete input characteristics terminals 11 12 13 1
10. 4 15 16 I7 l8 C1 3 C2 see Control circuit supply characteristics for cabling and tightening torques Rated insulation voltage Ui Conforming to IEC 947 1 V 250 VAC Operating voltage V 90 to 15 VDC 90 to 276 VAC 50 60 Hz Current consumption Minimum transient value mA 21 changing from 0 state to 1 state int gt 4 ms Input impedance KQ 56 1 For use with 110 to 690 V 50 60 Hz AC motors only Not approved for use with DC motors or variable speed drives 2 For motor full load currents gt 25 A use LT6POM005FM with customer provided external current transformers with 1 A or 5 A secondary outputs Ii SQUARE D LT6 Multifunction Protection Relays Characteristics Discrete output characteristics terminals 95 96 01 02 see Control circuit supply characteristics for cabling and tightening torques Rated insulation voltage Ui Conforming to IEC 947 1 V 380 VAC Type of output Relay 1 N O per channel Associated fuse protection Conforming to IEC 947 5 A 6 A max type RK5 AC loads Rated voltage V 250 VAC Permissible power VA 500 le 0 5 A Ue 250 VAC Ith 2 5 A cos 0 4 for category AC 15 for 100 000 operations Associated with contactor LC1 K LC2 K LC7 K LC8 K LC1 D09 to D95 LC1 F115 to F150 DC loads Rated voltage V 30 VDC Permissible power VA 50 le 0 5 A Ue 30 VDC Ith 5 A L R lt 25 ms for category DC 15 for 100 000 operations Associa
11. 5 s d 613 SLBA Control via serial link communication Channels A and B set for independent contro Maintained stop 3 aded e 95 di bibi KM2 KM1 al Reserved 96 L I8 Discrete input E I7 Discrete input D E Oi 16 Discrete input C s KM1 KM2 O2 15 Stop channels A and B 14 Start channel B Fault 97 I3 Start channel A signalling 98 A Local or serial communication control of A and B 93 I1 Reset Alarm 94 C1 Common 1 1kQ C2 Common 2 PTC probes n I L Control 1 A2 NC supply Earth fault H1 1 AT toroid H2 1L1 L11 L15 2T1 3L2 L21 L25 4T2 Oo 5L3 L81135 1 For DC control supplies the inputs 11 to 18 must be connected to the positive line 2 Disconnecting means and short circuit protection must comply with National Electrical Code and local codes 3 Local maintained stop must be connected when serial link is used without local stop push button 18 SQUARE D LT6 Multifunction Protection Relays Application Diagrams Motor control full voltage reversing starting with measurement of cos and voltage Control via serial link communication Channels A and B set for reversing control Maintained stop 3 CEN p 95 T Channe
12. ass 5 10 A 1 Wr 1 1 12 1 5 2 3 4 5 6 Z 8 1 Tripping time accuracy 8 to 7 2 x lIr SQUARE D 11 LT6 Multifunction Protection Relays Catalog Numbers 3 pole multifunction protection relays Operational current A Catalog Number 0 2 to 1 use terminals L11 L21 L31 LT6 POMOOSFM 1 to 5 use terminals L15 L25 L35 LT6 POMOOSFM 5 to 25 LT6 POMOOSFM LT6 POMO25FM For AC motor full load currents gt 25 A use LTePOMOO5FM with customer provided external current transformers with 1 A or 5 A secondary outputs Configuration software and user s manual Description For use Catalog Number with Configuration software kit All ratings of relay LA9 P620 3 1 2 diskette PC minimum requirements 2 meter RS232 cable 386 SX with Windows 3 1 User s manual USA Edition 91101M9701 Earth fault toroids ground fault current transformers Products marketed under the Merlin Gerin brandname For ordering references please refer to our Merlin Gerin Low voltage distribution 95 96 catalog pages D72 to D74 Sensitivity Internal Type Catalog Number of toroid mm 0 3 to 30A 30 TA30 50437 50 PA50 50438 80 1A80 50439 120 MA120 50440 200 SA200 50441 300 GA300 50442 46 POA 50485 110 GOA 50486 N
13. d adjusted from t e front face of the relay when set to Local the average current value of the 3 phases adjust Complementary Parameters Ability to Description Factory setting Adjustment functions preset and enable or range accessible function disable by via serial link enabled at serial link communication factory Voltage threshold Trip voltage 70 Un 68 to 120 Un detection YES Time before 10 000 sec 0 to 100 000 sec tripping Reset voltage 90 Un 68 to 120 Un Time before 10 000 sec 0 to 100 000 sec resetting Short circuit YES Isc 15 x Ir peak detection Automatic YES Time before reset 0 sec 0 to 1000 sec reset Iron 0 C before 100 0n 0 to 100 0n reset Motor control YES Control of Reversing Reversing outputs Independent A and B 2 stage Motor YES Cooling method Self cooled 3 Self cooled or cooling for motor external cooled 3 SQUARE D 5 LT6 Multifunction Protection Relays Characteristics Environment Conforming to standards IEC 947 4 1 IEC 34 11 IEC 755 VDE 0106 VDE 0660 European community directives C marking Meets the essential requirements of Low Voltage equipment LV amp Electromagnetic Compatibility EMC Approvals UL 508 CSA PTB Protective treatment TH Tropical Finish Degree of protection Conforming to IEC 947 1 IP 20 1 Pollution degree Conforming to IEC 664 Shock resistance
14. e temperature rise limit is not exceeded the life expectancy of insulating materials is extremely long It is decreased by approximately one half for an excess temperature rise of 10 C 18 F The operating temperature limit TL of an insulating material depends on the type of material and is the sum of the ambient air temperature AT cooling air the temperature rise limit TRL and an additional temperature rise value ATR considered necessary because the measurement of winding resistance variation does not determine the temperature of the hottest part of the motor winding but only gives an average value for temperature rise The diagram below defines the standardized limits for different classes of insulation In all cases the normal ambient cooling air temperature is fixed at 40 C 104 F E 356 180 329 165 311 155 284 140 266 130 257 125 248 120 239 115 212 100 140 60 104 40 32 0 E B F Insulation Classes HA 2 _ SQUARE D Ci LT6 Multifunction Protection Relays Motor Protection The rated power of a motor corresponds to its temperature rise limit for an ambient temperature of 40 C 104 F The temperature rise limits for the different parts of a machine are given in the following table which is an extract from IEC publication 34 1 Temperature rise limit Insulation class B F H Insulated winding
15. e unbalance and phase loss earth ground fault It provides control of up to two power contactors for non reversing reversing two speed and star delta motor starting fault signalling via an internal output relay and a 7 segment LED display Using serial link communication The LT6 may be set to protect against thermal overloads by monitoring motor currents up to 25 full load amps with internal current transformers greater than 25 full load amps with external current transformers overheating of motors with embedded PTC thermistor probes phase unbalance and phase loss earth ground fault underload prolonged starting time overtorque and locked rotor phase reversal low power factor It provides control of one or two power contactors for non reversing reversing two speed and star delta motor starting fault signalling via an output relay and a 7 segment LED display voltage limitation by monitoring voltage between phases signalling in the event of exceeding the short circuit current thermal alarm Bus communication provides information exchange between the LT6 and PLC or personal computer instantaneous values voltage current per phase frequency power factor thermal state of motor stator and copper windings data log of 5 previous trip incidents causes and remedies maintenance statistics cause of trip statistics operating and alarm states Ph
16. ial link communication Channels A and B set for 2 stage control Maintained stop 3 TRI INI Control Channel Discrete input C B Channel KM3 7 KM1 Reserved A Common 2 Discrete input E Discrete input D KM3 Stop channels A and B I4 Start channel B I3 Start channel A Fault 2 Local or serial com signalling 9g munication control of A amp B Reset Common 1 Alarm PTC probes Earth fault H1 toroid H2 1L1 L11 L15 3L2 L21 L25 Lane 1 For DC control supplies the inputs 11 to 17 must be connected to the positive line 2 Disconnecting means and short circuit protection must comply with National Electrical Code and local codes 3 Local maintained stop must be connected when serial link is used without local stop push button SQUARE D KM3 KM1 KM2 l La 21 LT6 Multifunction Protection Relays Glossary 22 Glossary PTC Positive Temperature Coefficient A thermistor resistor with a resistance value which increases with temperature and which increases very rapidly as the nominal operating temperature is reached RDF Residual Differential Fault earth leakage or ground fault rms Root mean square value of a signal l Line current Ir Motor full load current Id Phase imbalance current calculated value IA Residual differential fault current earth leakage cu
17. l kM2 KM1 va Reserved A 96 ey C2 Common 2 0v 18 Discrete input E v O1 I7 Discrete input D Channel Lkm KM2 I6 _ Discrete input C L BJ o I5 Stop channels A and B 14 Start channel B KH Fauli EH 18 Start channel A ea A Local or serial com 9na lng T gg munication control of A amp B Ti Reset 93 C1 Common 1 Alarm 94 Control A2 supply FAT 1 KO M PTC probes DET G 230V T2 NC Earth fault H1 toroid H2 L11 L15 211 3L2 L21 L25 4T2 O O 5L3 L31 L35 MR 613 1 For DC control supplies the inputs 11 to I7 must be connected to the positive line 2 Disconnecting means and short circuit protection must comply with National Electrical Code and local codes 3 Local maintained stop must be connected when serial link is used without local stop push button MO SQUARE D 19 LT6 Multifunction Protection Relays Application Diagrams Motor control star delta starting channels A and B set for 2 stage control Control via discrete inputs of relay Channel A Reserved Discrete input E KM1 KM2 KM1 KM3 L Discrete input D Discrete input C Stop channels A amp B Channel B Motor Trl stop Start channel B Start channel A Local or serial communi cation control of A amp B Fault Motor start Lu Reset signalling Common 1 Common 2 Alarm Control su
18. nsulation class method of construction self ventilated or forced ventilation enclosure type and varies according to the manufacturer Also in addition to the normal ambient conditions the rated power of a motor is defined by the manufacturer for continuous duty S1 This covers continuous operation of sufficient duration to enable the motor to reach a steady temperature It is this value of rated power that is normally shown on the motor plate There are other standardized types of duty such as temporary duty S2 or intermittent periodic duty type S3 S4 and S5 for which the motor manufacturer defines an operational power appropriate to each and different from the rated power 1 For temperature rise limits of 90 C 194 F and 100 C 212 F the brushes must be selected with the agreement of the motor manufacturer 2 These limit values may be exceeded depending on the quality of the grease used and the applied loads SQUARE D 3 LT6 Multifunction Protection Relays Functions LT6 POMOOSFM The LT6 is designed for the control monitoring and protection of AC motors Product functions not using serial link communication The LT6 protects against thermal overloads by monitoring motor currents up to 25 full load amps with internal current transformers greater than 25 full load amps with external current transformers overheating of motors with embedded PTC thermistor probes phas
19. ote Merlin Gerin earth fault toroids may be substituted with GFCT with 1000 1 ratio 12 SQUARE D LT6 Multifunction Protection Relays Catalog Numbers PTC thermistor probes Description Nominal Sold in Catalog Number operating lots of temperature NOT C Triple probes 90 10 DA1 TT090 110 10 DA1 TT110 120 10 DA1 TT120 BERT T 130 10 DA1 TT130 140 10 DA1 TT140 150 10 DA1 TT150 160 10 DA1 TT160 170 10 DA1 TT170 D SQUARE D 13 LT6 Multifunction Protection Relays Mounting Dimensions Protection relays LT6 P LT6 POM FM on 35 mm DIN rail Drilling pattern for panel mounting with M4 or ANSI 8 machine screws ejr cE g E o Jae 4 I S 3 5 15 in 2 12 in AN AFIEAS Clip 131 mm 54 mm For M4 screws on pre slotted mounting plate AM1 PA LT6 POMs FM weight 1 03 kg 2 3 Ibs Earth fault toroids TA30 PA50 IA80 MA120 SA200 5 N a a c a s ci al Dimensions in millimeters Dimensions in millimeters Type b b1 Qc c1 c2 H Type a al Ob bi b2 c ci G H J K TA30 83 53 30 60 31 50 IA80 26 5 44 122 80 55 80 150 35 65
20. pply 1 PTC probes Earth fault toroid L11 L15 3L2 L21 L25 5L3 L31 L35 Control via serial link communication Maintained stop 3 Esel Jose 95 gt Channel km3 KM1 KM3 za Reserved A 96 B 18 Discrete input E KM1 KMS I7 Discrete input D I6 Discrete input C C er iscrete inpu hi l anoal KM1 KM3 I5 Stop channels A amp B O2 A 14 Start channel B I3 Start channel A T2 Local or serial communi 97 cation control of A amp B Fault TI Reset signalling 98 C1 Common 1 93 C2 Common 2 Aian Control A2 94 supply 1 A1 iko 4 KM1 5 PTC probes Earth fault 2 toroid 14 ce 1LI LTI L15 3L2 s 3L2 L21 L25 5L3 aS 5L3 L31 L35 M 1 For DC control supplies the inputs 11 to 17 must be connected to the positive line 2 Disconnecting means and short circuit protection must comply with National Electrical Code and local codes 8 Local maintained stop must be connected when serial link is used without local stop push button 20 ______ 1 11 SQUARE D LT6 Multifunction Protection Relays Motor control star delta starting with adjustable time delay Application Diagrams Control via ser
21. rrent lAr Set value of the residual differential fault current earth leakage current lv Monitoring value of the underload current a multiple of Ir Imax The highest value of the three phase currents Imini The lowest value of the three phase currents lav Average value of the three phase currents Isd Monitoring threshold of the starting current a multiple of Ir lic Torque limitation locked rotor current loc Short circuit current Discrete On Off On Nominal temperature of the iron circuit reached with Ir after an infinite time Or Set temperature for the thermal overload alarm Cos 0 Power factor Earth fault Ground fault Earth fault toroid Un Ground fault sensor zero sequence current transformer Nominal voltage SQUARE D LT6 Multifunction Protection Relays Notes SQUARE D 23 Square D and D are registered trademarks of Square D Company MAGELIS V is a trademark of Schneider Electric SA Square D Company P O Box 27446 Raleigh N C 27611 USA 919 266 3671 Catalog 9110CT9702 07 97 1997 Square D All Rights Reserved MODBUS is a registered trademark of AEG Schneider Automation Inc
22. tandstill is four times longer than the cooling time of an external cooled motor Ii LT6 Multifunction Protection Relays Functions LT6 configuration table Functions Parameters Protection Parameters Ability to Description Factory settings Adjustment preset and enable or range accessible function disable by via serial link enabled at serial link communication factory Thermal overload Ir rating 20 96 20 to 109 1 YES Overload class 5 5 10 15 20 25 30 1 Overload alarm 100 96 0 to 100 Factory installed Overheating via YES 1 KQ resistor Enable or disable PTC thermistors to disable function Phase unbalance YES Id 96 rms average 2 30 average 10to 3096 and phase failure Start inhibit 0 7 sec 0 to 10 sec Time before 5 sec 0 to 10 sec tripping Earth ground fault YES YES lAr 30A 0 3t0 30A Time before 5 sec 0 to 5 sec tripping Prolonged starting YES Isp 96 Ir 150 Ir 100 to 500 Ir time Starting 10 sec 0 to 30 sec time Undercurrent YES lv 96 Ir 30 Ir 30 to 90 Ir Time before 10 sec 0 to 30 sec tripping Torque limitation YES l c 96 Ir 200 Ir 150 to 800 Ir Time before 10 sec 0 to 30 sec tripping Cos 9 YES Cos 0 0 1 1 to 1 power factor Time before 10 sec 0 to 10 sec tripping Phase rotation YES Disabled Enable or disable direction monitoring 1 These values can b 2 The average rms current is equal to e activated an
23. ted with contactor LP1 K LP2 K LP1 D09 and D12 LP1 D18 to D32 with LA4 DC1U or DC2U LP1 D40 to D80 with LA4 DC3U Signalling output characteristics terminals 97 98 93 94 see Control circuit supply characteristics for cabling and tightening torques Rated insulation voltage Ui Conforming to IEC 947 1 V 380 VAC Type of output Relay 1 N O per channel Associated fuse protection Conforming to IEC 947 5 A 4 A max Type RK5 Current limit AtU 5VDC mA 10 AC loads Rated voltage V 250 VAC Permissible power W 250 le 0 2 A Ue 250 VAC Ith 2 A for category AC 15 300 000 operations for resistive load Associated with contactor LC1 K LC2 K LC7 K LC8 K with suppressor block LA4 KE DC loads Rated voltage V 30 VDC Permissible power W 50 le 0 2 A Ue 30 VDC Ith 2 2 A for category DC 15 300 000 operations for resistive load Associated with contactor LP1 K LP2 K with suppressor block LA4 KC External current transformer characteristics Customer provided Must have 1 A or 5 A secondary output Conforming to standards IEC 185 IEC 71 Accuracy class 5P Accuracy limit factor 15 8 SQUARE D LT6 Multifunction Protection Relays Characteristics PTC thermistor probes DA1 TT Probe characteristics terminals T1 T2 see Control circuit supply characteristics for cabling and tightening torques Conforming to standards IEC 34 11 mark A
24. ysical features Power input terminals from the contactor and power output terminals to the motor 16 pin plug in connector for monitoring protection inputs 11 pin plug in connector for outputs for contactor coil thermal alarm and fault signalling 5 pin plug in connector for ground fault current transformer and PTC thermistor probes Two rotary dials for selection of motor full load current from 20 to 109 of the maximum rated current 1 A 5 A or 25 A of the LT6 relay Rotary dial for selection of Class 5 10 A 10 15 20 25 or 30 thermal overload protection DIP switch for selection of Bus communication address UNI TELWAY or JBUS MODBUS protocol Manual or automatic thermal overload reset Enable local front face or line serial communication link thermal overload settings Sealable transparent cover eliminates tampering with local front cover settings 7 segment display for fault indication Test button opens N C overload trip contact and closes N O fault signal contact Manual Reset button SUB D Serial interface port for bus communication For use with personal computer running Microsoft Windows 3 1 or Windows 95 with Configuration Software Kit LA9P620 includes RS232 cable and software For use with PLC or MAGELIS XBT terminal with XBT L100 programming software SQUARE D LL I 3 Thermal overload reset time is based on calculated cooling time Cooling time of a self cooled motor at s
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