ABB KF Instruction Leaflet Download Page 1 | Manualshive

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Courtesy of NationalSwitchgear.com

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Summary of Contents for KF

Page 1: ... air gap formed by the electromagnet and the magnetic core The stops for the moving ele ment contact arm are an integral part of the bridge CONSTRUCTION OPERATION The relay consists of an induction cylinder unit frequency sensitive components indicating contac tor switch and auxiliary time delay unit T The principal parts of the relay can be seen in Figure 1 A Induction Cylinder Unit The induction...

Page 2: ...n i ir S s 3 s r m TELEPHONE RELAY CVUNDI UNIT I 9 FREQUENCY ADJUSTING SCREWS Ss i m i l l l h f i mi ADJUSTMENT m TJ L i u SB ss R e a r V i e w F r o n t V i e w Fig 1 Type KF Relay for 60 Hertz Without Case Front Rear View Courtesy of NationalSwitchgear com ...

Page 3: ...ature to which leaf spring mounted contacts are attached is attracted to the magnetic core upon energization of the switch When the switch closes the moving contacts bridge two stationary contacts completing the trip circuit Also during this operation two fingers on the armature deflect a spring located on the front of the switch which allows the operation in dicator target to drop The target is r...

Page 4: ...ion This telephone relay in conjunction with a static timing circuit provides adjustable time delays i e 6 cycles to 30 cycles on pickup when the KF relay contacts close The contacts of the auxiliary time delay unit are connected in the trip circuit Voltage Timer Condition Burden Relay Type AC 60 Hertz KF with DCTimer N A 14 7VA 120 KF with Adjustable AC Timer Energized De energized 29 4VA 14 7VA ...

Page 5: ...I L 41 503N 671B023 Fig 5 Operating Characteristics of Type KF Underfrequency Relay for Changing Frequency Conditions 5 Courtesy of NationalSwitchgear com ...

Page 6: ...hould touch both stationary contacts simultaneously D Auxiliary Time Delay Unit T 1 AC Operation Non Adjustable Block cylinder unit contacts closed Apply 50 volts ac to terminals 8 and 9 of the KF relay The T unit should operate Reduce voltage to approximately 20 volts ac The T unit should drop out At rated voltage the time delay obtained from the telephone relay should be 6 cycles Time vs voltage...

Page 7: ... in position with the lock nut The lower bearing position is fixed and cannot be adjusted 2 0 3 The contact gap adjustment for the cylinder unit is made as follows With the moving contact in the normally opened position that is against the right stop on the bridge screw in the right hand stationary contacts until it just makes with the moving contact Then advance the stationary contact an addition...

Page 8: ...able Block the KF relay contacts closed Energize terminals 8 and 9 of the relay with rated voltage and frequency Time the clos ing of the telephone relay contacts This time should be 6 cycles o i z 57 Id 57 00 Hz SETTING o Id 56 5 cr ti ci 56 cr 2 555 2 z I 2 55 55 00 Hz SETTING 54 5 54 40 30 20 10 0 10 20 30 40 50 60 70 TEMPERATURE C 863A519 Fig 6 Typical Temperature vs Minimum Frequency Curves 6...

Page 9: ...I L 41 503N Fig 9 Typical Time Delay vs Impressed AC Voltage 9 Courtesy of NationalSwitchgear com ...

Page 10: ...rts can be furnished to the customers who are equipped for doing repair work When ordering parts always give the complete nameplate data and styles from the Electrical Parts List Sub 7 762A574 Fig 10 External Connections for the Type KF Underfrequency Relay with AC Operated Auxiliary Time Delay Unit K F R E L A Y C O U N T E R 8 T2 IP BUS POS c T A 1 10 KVI wr 1 T L _J fH ICS 7 fT fT P O W E R A M...

Page 11: ...3 CAPACITORS Cl 47 MFD 35 V 20 6 8 MFD 35 V 5 0 1 MFD 50 V 20 1N5053 G 1N645A Q 3 3 K 2 w 5 100 ohm Vi w 5 33 Ohm Vi w 5 15 K ohm Vi w 5 10 K ohm Vi w 5 470 ohm Vi w 5 H62 UTC 2N2647 UJT 2N3417 NPN 2N3645 PNP 1 N2986B 24 V 5 C2 C3 C5 C4 DIODES D1 D2 D3 D4 D5 D6 D7 D8 D9 RESISTORS Rl Rl l o R2 R3 R4 R5 R6 R7 TRANSFORMERS Tl TRANSISTORS Ql Q2 Q3 ZENER DIODES Zl DC ADJUSTABLE 6 TO 30 CYCLE TIMER FIG ...

Page 12: ...I 1 26 19 26 19 26 19 26 19 1 1 190 32 SCREW 375 1 344 SPACERS FOR 34 14 THIN PANELS 9 53 R PANEL CASE L c 5 16 18 SCREW q4 FOR THICK PANELS ik 09 USE 5 16 18 STUDS r INTERNAL EXTERNAL TOOTHED WASHERS 190 32 SCREW FOR THICK PANELS USE 190 32 STUDS 7 1 1 0 25 4 i n 3 5A 77 9 1 813 i 2 0 46 05 i 50 8 2 10V 4 6 8 j i Ifr 516 13 11 1 031 K1 031 26 19 26 19 26 19 26 19 750 TERMINAL NUMBER DIA 19 05 10 ...

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