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service manual 4554

1. SERVICE MANUAL 4554 DC PLUG IN CODED GROUND DETECTOR COMBINATION PD 63DC January 1978 hee Mie as Ko rer en ee _ UNION SWITCH amp SIGNAL rn 3 ioe AMERICAN STANDARD INC PITTSBURGH PA 15237 COPYRIGHT 1987 Veke DIVISION OF AMERICAN STANDARD INC PRINTED IN USA D SERVICE MANUAL 4554 STYLE PD 63DC PLUG IN GROUND DETECTOR CONTROL UNIT AND THE PLUG IN CODED GROUND DETECTOR COMBINATION This service manual describes the PD 63DC ground detector control unit and also covers the necessary information for shop testing the plug in coded ground detector combination consisting of one PC 56A code transmitter Service Manual 4518 or one PC 250TR code transmitter Service Manual 4569 one PN 150B biased neutral relay Service Manual 4596 one PP 64D code following relay Service Manual 4553 and the PD 63DC ground detector control unit The principles of operation and recommended method of field testing the plug in coded ground detector combination are covered by Service Manual 5480 which includes the figures referred to herein I GROUND DETECTOR CONTROL UNIT This unit consists of a housing containing circuit accessories resistors and capacitors and a control panel on which are mounted the test switches and ground indication lights This housing is designed for application to a standard size PN 50 plug in relay mounting base Information on indexing of the control unit is covered by Service Manual
2. 4525 The control unit must be tested in combination with the three other components of the plug in ground detector Il TESTING OF PLUG IN GROUND DETECTOR COMBINATION A Resistance Test With the reset button turned to the test position and the power lead to control unit terminal 13 disconnected it should be checked that the test ground resistance measured between terminals 13 and 26 is not less than 4750 ohms nor more than 5250 ohms January 1978 D 4 87 50 326 6 UNION SWITCH amp SIGNAL AMERICAN STANDARD INC PITTSBURGH PA 15237 COPYRIGHT 1987 US amp S DIVISION OF AMERICAN STANDARD INC PRINTED IN USA B Normal Voltage Test For this test all components of the around detector combination should be connected as shown in the fiaures with the ground connections Gl and G jumpered solidlv toaether The power supply should be as shown in the proner fiqure See Service Manual 5480 l With the system enerqized and the disconnect tovale switch in the normal position as shown the reset hutton should be pushed but not turned After a short delay the PN 150B relay should pick up causing the green no ground lamp to light The green lamp should remain lit when the reset button is released 2 The reset button should then be turned to apply the test and held in that position for a few seconds This should cause the red around lamp to be lit and the areen no ground lamp to be extinguished When t
3. he reset button is returned to its normal position the ground and ground lamps should flash alternately When the button is pushed again the red lamps should be extinguished and the green lamp should liaht 3 The test should then be repeated with the reset button turned to the test position to see that the qround lamp lights after a few seconds delay 4 With the circuit restored to normal conditions so that the green no ground lamp is lit a separate 5000 ohm resistor for the 16V relay not shown in figures should be connected between control unit terminals 13 and 17 This should cause the red around lamp to liaht A 40000 ohm resistor should be used for the 130V relay 5 With the circuit again restored to normal conditions the separate 5000 ohm resistor should then be connected between terminals 14 and 17 This should cause the red ground lamp to licht A 40000 ohm resistor should he used for the 130V relay 6 The circuit should then be restored to normal conditions and the disconnect switch moved to the disconnect position This should cause all lamps to be extinguished C Low Voltage Test After successfully testing the ground detector unit at normal voltage the voltage applied to the white lead of the RCS 2 rectifier capacitor unit should be reduced to 75 of normal If the rectifier capacitor unit is not used this reduced voltage should be applied directlv to terminal 16 of the PD 63DC c
4. ontrol unit as shown in figures 4554 p 2 i ED The voltage applied to all other terminals should he maintained at the nominal value l With the reduced voltage applied the steps of the normal voltage test procedure should then he repeated as explained in Section IIA 2 If the PN 150B relay fails to pick up on reduced voltage with the reset button depressed the PN 150B relav should be removed from its mounting base and the control unit checked as follows With the control unit reset button depressed the resistance between control unit terminals 16 and 25 should be measured by any convenient method This resistance should be approximately 100 ohms as indicated in figures If the resistor is open or measures less than 80 em it should be replaced The 1000 microfarad capacitor should then be checked using a capacitance tester with the lead connected to control unit terminal 25 and the lead connected to terminal 9 If the capacitance is less than 800 microfarads the capacitor should be replaced If a capacitance tester is not available this capacitor mav be checked by connectina a 100 ohm resistor and a dc ammeter with a 0 150 ma scale in series to terminal 25 and applvina 15 volts dc to the ammeter and terminal 9 If the leakage current through the capacitor is more than 5 ma after the voltage has been applied for 15 minutes the capacitor should be replaced 4554 p 3

service manual 4554

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