ABB ITH-T Series Installation, Operation & Maintenance Instructions Manual Download | Manualshive

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Courtesy of NationalSwitchgear.com

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Summary of Contents for ITH-T Series

Page 1: ...ay to check the setting and electrical connections 1 APPLICATION This 3 phase relay with individual phase indication is intended for use in applications where a nondirectional high dropout ratio overcurrent unit is required and a short time delay is needed to prevent operation on such things as transformer inrush current or dc offset cur rent This relay may be used on the supply side of a transfor...

Page 2: ...er regulator and a series resistor R1 The silicon power regulator Z1 is a 10 watt Zener diode mounted on the printed circuit board The series resistor R1 is a 3 1 2 inch resistor which is tapped for 48 125 volt dc relays Operation of the timing circuit occurs when a silicon controlled rectifier SCR1 switches from a non con ducting state to a conducting state In the non conduct ing state the SCR1 a...

Page 3: ... gap to obtain the desired pick up As long as the setting of the unit is within its nominal rating the drop out ratio will be 90 or greater Time Delay Range Seconds Voltage Rating Volts dc 48 125 05 1 0 6 1 Battery Drain 48 Volts dc 125 Volts dc The nominal range may be extended by increasing the contact gap with the core screw at its maximum position The drop out ratio for settings above the nomi...

Page 4: ...ng up the contact shield from the setting position until the contacts just close Changes in ambient temperature cause changes in time delay This variation in time delay is a direct func tion of capacitance change with temperature Typical variation of time delay with temperature is shown in Figure 2 7 ACCEPTANCE CHECK One turn of the shield is equal to 018 of an inch contact gap A timing check at m...

Page 5: ...terminals by means of screws for steel panel mounting or to the terminal stud furnished with the relay for thick panel mounting The terminal stud may be easily removed or inserted by locking two nuts on the stud and then turning the proper nut with a wrench Close the main relay contacts and pass 95 of rated indicator current dc through the trip circuit Adjust the operation indicator by moving the ...

Page 6: ...gure Description Drawing No Test Circuit 1 9651A26 Typical Time Delay Variation with Temperature 187A526 2 ITH T Internal Schematic 9651A12 3 ITH T External Schematic 1500B36 4 ITH T Relay Rear View Courtesy of NationalSwitchgear com ...

Page 7: ... ITH r 6 o _i L 9 TIMER STOP VOLTAGE RISC POSITIVE O RESISTIVE LORD NEGHTIVE O T l RESISTIVE LORD WL 5 a 120VBC 60hZ cr Q o r TIMER START MAKE OF CONTACT AC RESISTIVE LORD IS 2X PICKUP DC RESISTIVE AND WL COMBINED CURRENT IS 5A r Sub 1 9651A26 Figure 1 Test Circuit 7 Courtesy of NationalSwitchgear com ...

Page 8: ...I L 41 771 2 Figure 2 Typical Time Delay Variation with Temperature 8 Courtesy of NationalSwitchgear com ...

Page 9: ...HASSIS OPERATED SHORTING SWITCH CURRENT TEST JACK ITH ITH ITH RED HANDLE r TEST SWITCH 0 0 0 O 0 L_ 1 5 TERMINAL 6 4 10 FRONT VIEW Sub 1 9651A12 Figure 3 ITH T Internal Schematic 9 Courtesy of NationalSwitchgear com ...

Page 10: ...5 2 IT OTHER DEVICES o XIL r X 125 Ri 48 CS 2B 5 2 5 2 IT I o X X 52 TlfCR 0 05 1 05 52 x TC i IT INSTRWTRNEOUS TIfC 50 2 52 POWER CIRCUIT BRERKER 52TC PCB TRIP COIL 52 hCG I 1 52 HUX SWITCH DC SCHEMATIC AC SCHEMATIC Sub 1 1500B36 Figure 4 External Schematic Courtesy of NationalSwitchgear com ...

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