Siemens SG-3118 Installation Operation & Maintenance Download Page 1 | Manualshive

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Courtesy of NationalSwitchgear.com

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Summary of Contents for SG-3118

Page 1: ...SIEMENS Overcurrent Trip Devices Instructions Installation Operation Maintenance SG 3118 Static Trip III Courtesy of NationalSwitchgear com ...

Page 2: ... following qualifications a Is trained and authorized to energize de energize clear ground and tag circuits and equipment in accordance with established safety practices b Is trained in the proper care and use of protective equip ment such as rubber gloves hard hat safety glasses or face shields flash clothing etc in accordance with established safety practices ADANGER h Indicates death severe per...

Page 3: ...l is misplaced or lost replacement manuals are available through the local Siemens Energy Automation Inc sales office These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation operation or maintenance Should further information be desired or should particular pro blems arise which are no...

Page 4: ... devices are complete ly static There are no moving parts or mechanical contacts Components used are semiconductors integrated circuits capacitors transformers etc The selector switches are seal ed binary coded decimal types with gold plated contacts The device uses an eight bit single chip microprocessor with its internal ROM Read Only Memory programmed to be a trip device All the circuits are de...

Page 5: ...I Courtesy of NationalSwitchgear com ...

Page 6: ...itor 1 Farad to store the power to operate the logic and LCD for an extended period of time The LCD has four legends that become visible when the target is operated either by the microprocessor or the watchdog circuit The four legends are OVERLOAD to signal long time tripping SHORT CIRCUIT to signal either short time or instantaneous tripping GROUND FAULT to signal when the device trips on ground ...

Page 7: ...or 4 wire circuits on systems with either phase to phase or phase to neutral loading Ground current pickup settings are independent of the phase pickup settings and are adjustable from 20 to 60 theground sensor rating When used on 4 wire systems a fourth neutral sensor is required It ismounted in the bus compartment is wired to the breaker through the breaker secondary disconnects The ground eleme...

Page 8: ...ired between trip devices When this op tion is specified the trip device is provided with a cord to connect to a cubicle mounted connector The trip device provides anoutput signal whenever either the ground or short time element picks up This output signal is connected from the downstream breaker to the input terminals of the upstream breaker 3 With no signal applied to the Zone Interlocking in pu...

Page 9: ...g in on a single phase fault the total clearing timemay be extended by asmuchas 02 seconds Connection Diagrams Figure 4 through 6 show in schematic form the pre wired connections from the breaker mounted cur rent sensors to the Static TripIII device This wiring varies with the application The three most commonly used schemes are shown and the diagrams with their captions are self explanatory he wi...

Page 10: ...IW x 10 1 8 8 SHORT TIME PICKUP ADJUSTMENT RANGE 2 3 4 5 6 7 8 t 12 TIMES LONG TIME CURRENT SETTING A A 6 X 6 z z a NA 5 a 4 4 u J Nil UJ LJ A A N v SHORT TIME I2t SVITCH z z To IN 2 2 yy yy y LJ UJ OUT z z X GROUND CURVES G V V SHORT TIME CURVES S3 l 8 8 v IV y V x z 6 1 X1 6 Z 5 X X V U lAO 4 4 m x v h V s 22 V 2 2 A I x r r 10 1 08 08 06 k y 06 p7 INSTANTANEOUS PICKUP v ADJUSTMENT RANGE 2 4 6 0...

Page 11: ...2 G CT3 G STD 4 STD 4 STD 5 18 5 C2 18 C3 18 CO 18 CO 18 CM CO o CO 18 Black o O O o SO 2 18 Redjx SD1 SD 1 18 SD2 TA1 STD 6 STD 7 STD 8 Black b TA2 Red 1 2 3 4 5 6 7 TA3 Blue Figure 5 Static Trip HI 4WRG Connection Diagram Wire Size To From CT3 CT2 CT1 No 6 G STD 1 STD 2 STD 3 CT2 G CT3 G STD 5 STD 4 STD 5 18 C1 CT1 Y CT2 Y CT3 Y CT1 G CT2 G CT3 G SD 2 Y Y 18 C2 18 C3 18 CO 18 CO CM CO 18 CO O O ...

Page 12: ...900 800 880 1360 1440 1520 1600 1600 960 1040 1120 1200 1280 2000 1000 1100 1700 1800 1900 2000 1200 1300 1400 1500 1600 1760 2720 2880 3040 3200 3200 1600 1920 2080 2240 2400 2560 4000 2000 2200 2400 2600 3200 3400 3600 3800 4000 2800 3000 Figure 8 Long Time Element Calibrated Current Settings NOTE There is a plus or minus 10 tolerance allowable on the accuracy of the trip device pickup values Th...

Page 13: ...ting appears on the sensor rating label above the trip unit terminal block connection trip Sensor Rating Primary Amps As explained earlier the rated secondary current for the sen sors is 0 5 ampere so the 20 setting is 0 100 ampere into the trip device ground terminal and the pickup tolerance is 10 of this value 20 60 50 30 40 75 90 150 60 30 45 200 100 120 80 40 60 300 60 150 180 90 120 200 240 4...

Page 14: ... It derives its power from the upstream device The power for each op tical isolator input is supplied from its own downstream trip device No external power is required Load Indicator This device is not a part of the basic overcurrent protection system but is an available option The device mounts in the front cover of the circuit breaker and its input cord plugs into a recep tical on the front of t...

Page 15: ...rent setting may be set too Secondary Current Testing low Portable test set PTS4 is available for secondary current testing and is designed to plug into a standard 120 volt outlet With this test set Static Trip III trip devices can be tested by themselves or on a circuit breaker outside the cubicle or in side the cubicle with the breaker in the TEST or DISCON NECTED position Figure 11 shows the PT...

Page 16: ...shown in Table 1 Repeat for other SHORT TIME settings as desired On devices with Targets the SHORT CIRCUIT targets should operate when the device operates on its IN STANTANEOUS or SHORT TIME element NOTE Do not allow currents above one ampere to continue for more than a minute at a time to avoid overheating the trip device A circuit breaker is provided in the PTS4 test set to prevent thermal damag...

Page 17: ... device should never time out and it should be possible to continue the cycle indefinitely 1 Move the switch above the timer LED readout on the PTS4 to Static Trip III Long Time 2 Close the switch and set the current to the desired value 3 Open the switch and close the circuit breaker 4 Without changing the setting of the current source close the switch and measure the time until the breaker opens...

Page 18: ... are connected together into a Zone Interlocking System through a Zone Interlock Coupler and or Zone Interlock Expander mounted in the breaker cubicle The Zl output is an isolated transistor that can be checked with an ohmmeter or by using a dropping resistor and connecting up both the device s positive and negative power supply and detecting turn on of the transistor with a voltmeter This tran si...

Page 19: ...nnects to the terminal block with the positive terminal on number 7 and the negative terminal on number 6 The leads of the actuator are also color coded red is positive black is negative and blue is the hold in winding With the breaker dosed apply DC voltage to the terminals for the trip winding start at zero voltage and slowly increase until the actuator trips The voltage shouldbebetween 3 and 6 ...

Page 20: ...w levels of current thenchange impedance for higher levels of current to protect the trip device When sup plied from alow voltage source this changing impedance alters me waveshape of the current supplied to the trip device This can result in insufficient power to properly operate the trip device or it may affect the indication of the source ammeter depending on the ammeter design leading to the e...

Page 21: ...h value to definitely cause tripping apply current and verify that tripping does occur as expected trip device high range settings cannot be accurately done with primary current The calibration can be verified safely at the lower settings and operation only verified at the higher set points If the duty cycle limits are exceeded during testing the circuit breaker or current sensors as well as the t...

Page 22: ... be sure the air is clean and dry and the jet is not too strong The Static TripIIIdevice mounts on a slide bracket on the cir cuit breaker To remove the trip device remove the terminal cover strip from the terminal block above the trip device Loosen the 8 slotted head screws to remove the trip device terminal strip from the terminal block This exposes one retaining screw Remove this screw and slid...

Page 23: ...Siemens Energy Automation Inc Switchgear Division P O Box 29503 Raleigh NC 27626 919 365 6660 SIEMENS f C Printed in USA 2M 10 87 Courtesy of NationalSwitchgear com ...

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