SM-2666J - Ansaldo STS
Contents
1. magnet providing the 110 allowance is not exceeded 4 When the working is above 110 of the table value SU 2666 J p 3 WABCO VA CHECK OF PERMANENT MAGNET A Reverse Pick Up The armature shall not pick up or move away from the permanent magnet when the relay is energized with a reverse polarity ener gization negative lead on the coil terminal equal to four times the pick up value in Table 1 or 2 B Hold Down Torque With the relay in the normal upright position and with the coils deenergized a force of 100grams applied on the front edge of the full thickness portion of the armature shall be required to cause the armature to move away from the permanent magnet This check shall be made after ener gizing the relay at the Charge value with normal polarity of energization TABLE NO 1 CALIBRATION VALUES FOR DN 22B TWO POINT ORDINARY ACTING RELAY WITH L V CONTACTS SMALL BACK STRAP ARMATURE AIR GAP 0 019 PARALLEL Resis Min Drop Away Min D A Max Pick Up amp per pair with Contact Full Back Working of Coils Pressure Cont Press Full Stroke 0 106 0 074 0 053 n 03 0 024 0 0192 0 0160 0 0118 0 0099 0 0084 0 0080 a 0 0065 0 0113 0 0052 i 0 0092 0 0044 0 0077 0 0035 0 0062 0 0032 0 0056 0 0026 0 0047 0 0022 0 0039 0 0019 0 0034 Coils are connected in multiple TABLE NO 2 CALIBRATION VALUES FOR SPECIAL DN 22B TWO POINT ORDINARY ACTING R2. 25 relay magnets modified with the filler core Charger for DP 14 relay mag nets may be used if similarly modified and proper polarity of charge is observed FIGURE 1 The air gap between the plated armature and the plated permanent magnet should average 0 004 but should be not less than 0 003 at any point The magnet must be securely clamped and the screws properly locked with the sheet metal washer provided CONTACT ADJUSTMENT Per Service Spec SU 2666 except as follows A Front contacts should be adjusted using a 0 035 normal spacer at the main stop pin instead of 0 033 A change in spacer is permissible if needed to meet calibration requirements but it should not be necessary to decrease the spacer below 0 030 B Backcontacts should be adjustedto all make together and to have at least 0 020 opening when the front contacts are just making This can be accomplished if desired by adjusting them with a spacer at the stop pin 0 014 thicker than that used for adjusting the front contacts Thus if a 0 035 spacer has been used for adjusting the front contacts a 0 049 spacer should be used for the back contacts A check must be made to see that with a 0 016 thick spacer between the permanent magnet and the stop pin on the underside of the armature the back contacts remain closed C Bridging contact when used front spring should be adjusted the same as standard front contacts as explained in A under Contact Adjus
3. ELAY WITH L V CONTACTS AND LARGE BACKSTRAP ARMATURE AIR GAP 0 019 PARALLEL Resis Min Drop Away Min D A Max Pick Up amp per pair with Contact Full Back Working of Coils Charge Pressure Cont Press Full Stroke Ohms Amps Amps Volts Amps Volts 0 073 0 0104 0 626 0 0070 0 0183 1 10 SU 2666 J p 4
4. UNION SWITCH amp SIGNAL E IE oir De ci as Service Manual 1 2666 J e DN 22B Standard Biased Relay Service Manual ANSALDO Affiliated Compan BO 59 300 1009 3 3 LANSA DO AAE Pame 1976 Union Switch amp Signal Inc D Printed i in U S A July 1965 A DA 3 WABCO DN 22B STANDARD BIASED RELAY dk ook RR o oe ak a oce oe ok o ok ok For other information see Service Spec SU 2666 The relays of this service specification are similar to standard DN 22 re lays covered by Service Specification SU 2666 but a permanent magnet is used to hold down the neutral armature when the relay is deenergized or energized with reverse polarity Due to the space taken by the permanent magnet front contacts are used only in the outer contact spaces Service Specification SU 2666 standard DN 22 relay instructions apply to DN 22B standard biased relays except as otherwise specified herein The armature air gap should be adjusted as closely as possible to 0 018 parallel 0 019 if the rust protective coating has been removed from the pole faces The physical air gap after painting should not be less than 0 017 If it is necessary to repaint the pole faces we recommend that Union Pole Face Treatment per Instruction Pamphlet U 5038 be used This pamphlet also covers an aluminum paint material for touching up armatures backstraps and similar parts PERMANENT MAGNET A Permanent magnets should b
5. e removed from relays being repaired then fully charged in the charger as shown in Fig 1 and immediately assembled to the relay The magnets must not be stored or handled after charging except to apply to the relay The magnet should be placed on the charger core withthe N face up as shown in the diagram The 2 hole face on the N side should attract the end of a compass needle which points toward geographic South B Assemble the permanent magnet to the relay and adjust using a spacer 0 075 thick at the main upper stop pin so that the magnet just clears the arma ture lower stop pin For this adjustment do not energize the relay to hold the armature against the spacer but hold it manually so as to bring the armature as close to the pole pieces as the spacer and the pivot clearance will permit The spacer used for adjustment may be changed between the limits of 0 065 to0 090 UNION SWITCH amp SIGNAL DIVISION oe PRINTED IN U S A B0 59 300 1009 3 Westinghouse Air Brake Company July 1965 PITTSBURGH PA 15218 WABCO VA if necessary to meet calibration requirements With the adjusting spacers removed and the armature released the armature lower stop pin should rest on the permanent magnet shoe with at least 50 of its area x PERMANENT MAGNET SOFT IRON FILLER CORE 7 8 MIN DIAMETER NOTE THERE MUST BE NO GAPS IN JOINTS AT POINTS x Charger illustrated is Pc UN248674 for DP
6. tion at which this occurs shall be not less than the table value for Drop Away for Full Back Contact Pressure C Pick Up Immediately after the drop away value has been measured the current shall be reduced to zero the circuit opened for one second and then closed gradually increasing the currentuntil the armature moves away from the permanent magnet with a very definite sudden motion This value shall be not more than 90 of the actual pick up value measured on the tested relay The current shall then be further increased until the armature picks up and the front contacts make This value shall be not greater than that specified in Table 1 or 2 for Pick Up D Working This value shall be obtained immediately after pick up by further increasing the current until the armature completes its motionand closes against the stop pin This value shall be not greater than that specified in Table 1 or 2 for Working SERVICE TESTS It is recommended that the following calibration limits be used to determine when relays should be removed from service 1 When the drop away of line relays falls below 67 of table value or when the drop away of track relays falls below 85 of table value 2 When the drop away for full back contact pressure falls below 25 of the table value 3 When the pick upincreases above 110 of thetable value For field tests it is satisfactory if the armature picks up directly from the permanent
7. tment The back SU 2666 J p 2 WABCO NBN contact should be adjusted the same as standard back contacts except the spacer used should be 0 013 thinner than that used for front contact adjustment This means thatif a 0 035 spacer isused to adjustthe front contact a 0 022 spacer should be used to adjust the back contact to just open A spacer 0 001 thicker than that used for this adjustment should allow the back contact to close With the armature against the stop pin the bridging back contact opening must be at least 0 025 CALIBRATION A Before Calibrating the relay should be energized at the Charge value given in Table 1 or 2 and the energization pole changed severaltimes allowing the current to build up to full value in each direction When the positive power lead is connected to the coil terminal the armature should pick up When the polarity of the power supply is reversed so that the negative power lead is connected to the coil terminal the armature must not pick up B Drop Away The relay should be energized at the Charge value with normal polarity and the current then gradually reduced until the armature drops away opening all front contacts This value shall be not less than that specified in Table 1 or 2 for Drop Away The current should be further reduced gradually until the back contacts are fully compressed with the armature against the permanent magnet shoe The energiza
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