TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas

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Page 82 Lubrication 1. Oil to spec. 57544 Grade 2 shall be applied sparingly to : (a) Ratchet wheel hub inner diameter and bearing pin. (b) Ratchet wheel hub outer diameter. (c) Wiper tips. The lubricant shall be distributed over the bank contacts by rotating the wipers electrically. (d) Collector rings. (e) The felt inserts in the armature restoring springs shall be steeped in oil before assembly. 2. Oil dag to spec. 50227 shall be applied sparingly to : Operation Tests (a) All teeth of the ratchet wheel. (b) Striking face of the armature back stop. (c) Striking face of pawl stop. (d) Knife edge and sides of armature locating lug. (e) Point of attachment or armature restoring springs to armature. 1. The electrical operation shall be tested with a spark quench circuit of 1 μF and 200 ohms, connected to earth from a point between the magnet coil and the interrupter contacts. The selector shall be mounted vertically with the magnet assembly uppermost. 2. Hunting Test 2.1 With the nominal voltage applied to the magnet coil in series with the interrupter contacts, the wipers shall rotate smoothly and reliably and the hunting speed shall be within the following limits :
2.2 The wipers shall rotate smoothly and reliably when the nominal voltage is applied across the magnet coil interrupter contacts and a fixed resistor, all in series. The value of the fixed resistor is that shown in the following table:— 3. Homing Test 3.1 All selectors fitted with a homing arc shall home reliably and stop accurately on the home contacts with the test voltage, as specified below, applied to the magnet coil, interrupter contacts, homing arc and wiper all in series. Page 83
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TRAFFIC CONTROL TELEPHONE SYSTEMS C
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CONTENTS Part Title Page 1 Key Syst
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swing of the meter needle either si
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One No. 4002-B Selector Key Case (c
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wires. This change of polarity is t
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Case), K2 terminal (Time Sending Se
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Where satisfactory operation cannot
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one is available (if not, with an o
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PART 2 4001-A SELECTOR KEY Selector
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The keys are easily removed from th
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Letter. Name. S.T.C. Code. A Impuls
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4. When the key is normal the tip o
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the time terminal. During selective
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Cycle of Events on Receiving a Code
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Mechanical Requirements To assist i
Page 33 and 34: (b) The contact spring (Z) in the n
Page 35 and 36: Letter Name 4301-A 4304-A 4305-B A
Page 37 and 38: General PART 4 4001-B SELECTOR TEST
Page 39 and 40: 4001-B Selector Test Set, Schematic
Page 41 and 42: General PART 5 DIAL SYSTEM, SELECTI
Page 43 and 44: The speak key also connects the con
Page 45 and 46: normal, Relay IR is held operated a
Page 47 and 48: here that from SC bank contacts 29
Page 49 and 50: from Line switch SC banks 1 and 2 a
Page 51 and 52: Line Test Set . . . . . . Designed
Page 53 and 54: Line Voltage Curves Fig. 14. The op
Page 55 and 56: General PART 7 LINE TEST SET-LU.310
Page 57 and 58: Operating Instructions 1. Voltage M
Page 59 and 60: the particular line to the earthed
Page 61 and 62: Operate CVK, note meter reading on
Page 63 and 64: 10. Impulse Ratio Check on Selectiv
Page 65 and 66: 12. Telephone Communication. (See F
Page 67 and 68: Page 65
Page 69 and 70: Armature Travel Armature travel is
Page 71 and 72: Contact Sequence The standard conta
Page 73 and 74: chloride or trichlorethylene. The t
Page 75 and 76: PART 9 ADJUSTMENT AND MAINTENANCE D
Page 77 and 78: 9. Armature Restoring Springs:— T
Page 79 and 80: Oil dag should be applied as above
Page 81 and 82: 3. Pawl Spring Tension 3.1 With the
Page 83: 8.6 The wipers shall exert a pressu
Page 87: Registered Office: CONNAUGHT HOUSE
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TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas

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