ABB D-3 Instructions Manual Download Page 1 | Manualshive

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Summary of Contents for D-3

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Page 2: ...s on the principle of a current carrying conductor moving coil located in a mag netic field permanent magnet When a current is applied to the coil of the relay a torque is produced that rotates the moving coil until the electrical torque is equal to the torque of the restraining spring The moving contact will assume a position in its travel that is proportional to the current applied to the mov in...

Page 3: ... scale deflection can be obtained with 6 milli amperes ac Relays modified for AC volts can also be supplied The relay has a slight time delay with inverse char acteristics In the usual application the moving coil terminals are connected across a shunt and this results in longer delay for both operating and reset times When a shunt is used the operating time for full scale travel at 125 of the full...

Page 4: ... INSTALLATION The relays should be mounted on switchboard pan els or their equivalent in a location free from dirt moisture excessive vibration and heat Mount the relay vertically by means of the four mounting holes on the flange for semi flush mounting or by means of the rear mounting stud or studs for projection mount ing Either a mounting stud or the mounting screws may be utilized for groundin...

Page 5: ...0 5 due to lead resistance The use of standard ammeter shunts may be avoided by connecting the moving element leads over an equivalent length of bus bar or cable On a basis of 1000 amp per square inch at 20 C 6 feet of copper bus bar will give 50 millivolts drop 7 0 ADJUSTMENTS AND MAINTENANCE The proper adjustments to insure correct operations have been made at the factory Upon receipt of the rel...

Page 6: ...he core screw until the moving core starts rotating Now back off the core screw until the moving core stops rotating This indicates the points when the play in the assembly is taken up and where the moving core just separates from the stationary core screw Back off the core screw approximately one turn and lock in place This prevents the moving core from striking and sticking to the stationary cor...

Page 7: ... D 3 Direct Current Relay 41 151 1H 7 Figure 9 Type D 3 Relay without case 1 Moving Coil 2 Current carrying restraining springs 3 Permanent Magnet 4 Iron Frame 5 Scale 6 Moving Contact 7 Stationary Contacts ...

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