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Fig. 1 - Type EM-I Photo-Troller with Long Focusing Tube - Cover Closed Application The Westinghouse 1ype RM-l Photo-Troller for heater control meets the requirement for a truly industrial device which operates from the light emitted from a piece of hot metal While being heated electrically. 1he light from the metal falls on a phototube controlling an amplifier tube, which in turn actuates a Thyratron tube directly. The Thyratron tube operates a contactor whose contacts will carry several amperes. 1he equipment automatically shuts off the power supply to a heater. Since the amount of light emitted is proportional to the temperature of the metal, the Photo-Troller can be arranged to trip the power supply at a predetermined temperature. Provisions are included in the Photo-Troller to lock out the power cireuit immediately after the metal reaches the proper temperature and the operation is reinitiated only when the operator has put in a.new piece of metal and depressed a starting button manually. - Type RM·l Photo-Troller Instructions for Operating 1 Description , I. B. 5670-50 The equipment is mounted in a sheet metal cabinet. The apparatus mouned in the cabinet consists of one RJ-571 amplifier tube, one KU-636 Thyratron tube and two 2-pole contactors. In addition, there is a phototube mounted on the lower end of the panel and facing toward the lens assembly. Sometimes the phototube and lens assembly is mounted remote from the cabinet. Behind the panel are located a transformer, rectifiers. capacitors, and other auxiliary parts. Extending from the bottom of the cabinet is a sight tube having mounted on its outer end a lens and a pr otective glass over the lens. On the front cover of the unit is mounted a pushbutton for emergency tr ip, a star t,pushbutton, a potentiometer for adjusting the operating points, and a dial to allow resetting of the equipment to a previously determined operating point. Installation The Photo-TrOller must be mounted vertically in order to keep the relays in the proper operating. position. The mounting of the Photo Troller should be as rigid as possible to insure fixed alignment of the optieal system. Fig. 2 Type B Phototube Housing The Photo-Troller will not be injured by any vibration which does not mechanically damage the apparatus,although vibration should be a minimum at the point of installation. The KU-636 Thyratron tube which is supplied with-the Photo Troller is not affected by temperature changes and therefore the PhotO-Troller can be mounted in any location where the ambient temperature is between 140 degrees F. and -10 degrees F. If the Photo Troller is being used on a heater for heating extremely large pieces of metal to h:lgh temperatures which result in a high radiation of energy, a shield or baffle of asbestos should be located between the PhotO-Troller and the hot metal. The baffle should be so arranged that there is a free circulation of air provided ar ound the Photo-Troller cabinet. The Photo-Troller should be mounted so that the hot metal to be observed lies on the axis of the lens and metal tube. Locate the lens 12" from the metal. 1he axis of the metal bar should be parallel with the axiS of the phototube in all cases. www . ElectricalPartManuals . com
Westinghouse Type RM-l Photo-Trol ler Panel (Front ew) (Rear V/ew) tube should break down and operate the relays . The milli-ampere meter 0.4 when this occurs . should read app roximat ely Make sure that the image of the hot me tal is focused on the center of the phototube. The operation is initiated by operating the stop pushbutton. Ad just to the proper temperature for trip-out by turning the potentiome ter knob on the front of the cabinet to operate at the desired point . If the potentiometer cannot be adjus ted to make the unit trip out at a sufficiently high temperature, an aperture should be added in front of the phototube to reduce the amount of light reaching it and thus place the potentiometer in position to control at the de sired point . It should always be the obj ect to make adjustment in such a way that operation is obtained at the proper temperature when the potentiometer is as far from zero as possible. Do not operate with a smaller aperture than necessary. When properly adjusted as described, the operation should repeat it s elf accurately on successive heats. To obtain satisfactory operation the potentiometer must be adj usted to give a mi lli-ampere meter reading when the phototube is dark, which is at least 0.05 milliampere higher than the mi lliampere current required to operate the relays . If, for examp le, the relays operate when the mi lli-amp ere meter reads 0.4, the minimum potentiometer adj ustment whi ch can be used is that which gives is dark. 0.45 milliampere when the phototube If the RM -l Photo-Troller is used to control tempera tures less than 1500 degrees F. it is important that no extraneous light , for exam ple , sun light or artificial room illumination reaches the metal piece to be heated, because reflection may be of an intenSity comparable with the light radia ted from the metal at low temperatures. Under these circumstances it becomes necessary to carefully shield the metal from the extraneous light . It often happens that sparking wi ll occur between the metal and the jaws wh en the metal is being inserted in the jaws . To prevent t'hi s sparking froll! prematurely tripping the Photo-Troller it may' be necessary to arrange a shield to prevent the light emitted from the se sparks from reaching the phototube. This shield may be in the form of a permanent aperture, shielding the outer rim of the metal, or may be arranged as a movable shield, mechanically or electro-magnetically operated which is interposed betWeen the phototube and the metal unt il such a time when the initial sparking has subsided . General: Maintenance The maintenance schedule for the Photo TrOller depends largely on the individual operating oonditions . However, it is recommended thf t for service OL heater control, the adj ustment be checked each morning. It is particularly necessary that the lens and optical system be cleaned often enough to maintain maximum optical efficiency. In unusual cases, very frequent cleaning may be necessary, depending on the condition of the surrounding atmosphere . It mus t, of course, be epected that a dusty atmosphere will foul the glass surface's more quickly than clean air. The glass window whi ch protects the lens should be reolaced when it becomes pitted due to \ Westinghouse Type RM-l Photo-Troller tube if mi lli-ampere meter reading is not 0.5 or higher. 2. Adjust potentiometer until milli-ampere meter reads 0.4. Observe potentiometer position. By turning the po tentiometer 0.5 division counterclockwise from the ob served po sition the milliampere meter reading should be 0.2 or less. If this is not the case, replace the RJ-57l tube. 3. If the KU-636 tube does not operate when the mi lli-ampere meter is between 0.25 and 0.45 replace the KU-636 tub e. 4. If during the preceding tests the RJ -571 and KU- 636 tubes have performed satisfactorily, but if unsatisfactory overall operation is obtained, rep lace the SK-60 phototube . 5. If rep la cement of tubes does no t improve operation, and if satisfactory results cannot be obtained during the preceding tests, proceed as follows : 6. Milli-Ampere Meter Reads Always Zero : (a) Resistor 17- 19 is open-circuited. (b) Mi lli-ampere cuited. met er is open-cir (c) RJ -57l tube socket does not make contact with tube prongs . (d) Th ere is no voltage across 7-17 and 9-7. This voltage should be app roximat ely 90 volts. Check by means of a d-c. voltmeter. (e) If there is no voltage across 7- 17 and 9-7 check capacitors for short-circuit, Rectox 9-16 and 16- 17 for open circuit , and check voltage across 16- 12 which should be 65 volts a-c. (f) Make sure that the RJ -57l filament 30-31 is heated . Tube should feel warm af ter being in circuit for five minutes . (g) Check phototube leads for ground and short-circuit. Measure resistance between leads with phototube removed , and adapter removed from phototube socket . The resistan ce as measured by a megger should be 100 MEGS or higher. 7. Mi lli-Ampere Meter Reads Always 0.5 or Highe r: (a) Check a-c. voltage 27-28 should be approximately 75 volts . (b) Check d-c. voltage 10-14 which should be approximately 100 volts . www . ElectricalPartManuals . com Tube Replacement : (c) Make sure that Phototube leads are not grounded.
Page 1 and 2: W E S T I N G H 0 USE TYPE RR-7 REG
Page 3 and 4: WESTINGHOUSE ELECTRIC & MANUFACTURI
Page 5 and 6: ( ) 4 .s- . 7 8 S I/J 1'1 /z /.JI
Page 7 and 8: '. .. . Preface , : ; o Ii List of
Page 9 and 10: Ii , ,' t , \ .C st1nghouse Type RX
Page 11 and 12: tt .' \ ,,, " - " Westingos Type R
Page 13: • I ! I I I i I i I , I t-: I I I
Page 17 and 18: I. B. 5670-50 LENS Westinghouse Typ
Page 19 and 20: COMMUNICATIONS When communicating r
Page 21 and 22: DESCRIPTION INDEX PREFACE . .......
Page 23 and 24: (2) HOW TO SELECT AND APPLY PHOTO-T
Page 25 and 26: Vote ' EA Scale /5 -- o of other Sc
Page 27 and 28: (13) Adjustments : (1) Turn on powe
Page 29 and 30: Westinghouse Type RX-l Photo-Trolle
Page 31 and 32: 18-310 PRICE LIST PAGE 2 WESTINGHOU
Page 33 and 34: 18-310 PRICE LIST PAGE 4 WESTINGHOU
Page 35 and 36: Memorandum (Use Ink) 20 www . Elect
Page 37 and 38: W E S T I N G H O U S E TYPE SC -1
Page 39 and 40: C\J t-- I o t- \0 L[\ C A U T I O N
Page 41 and 42: (\J t-- I o t- \.0 l..!1 6 - II-OPE
Page 43 and 44: C\J In selecting the various comb
Page 45 and 46: By ob serving tube III it will be s
Page 47 and 48: V-ARRANGEMENT OF PRINTING AND COLOR
Page 49 and 50: 28 - (A ) Rep lace glows. 29 - Keep
Page 51 and 52: position of l/ inc h is ob ta ined
Page 53 and 54: (\/ t- I o t- 1..0 L0 D - TUBE II D
Page 55 and 56: 17 J-11 : I t!< Vf-/.- li/I 1 6- ,
Page 57 and 58: ABILENE, KANSAS, Union Electric Co.
Page 59 and 60: De scriJ2tion INDEX TO CONTENTS Lis
Page 61 and 62: ,. I - Description TYPE RR-8 FlEGIS
Page 63 and 64: """ .. Additional parts to change r
Page 65 and 66:
gradua lly . If the voltage changes
Page 67 and 68:
transmi ttancy be tween the paper a
Page 69 and 70:
(b) Scanner Connections Connect sca
Page 71 and 72:
switch adjustment can be found only
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(3) The #1 WL-629 tube glows contin
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c , I .... E..-I G= .I -.... ====.=
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c NOCKOUT IN OOR ONL.Y Ir 1 I "It i
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11111 I 2. 3 x 4 5 6 r-- .. Lflf1I.
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c c 1 WINDOW ASSeMBLy. S:#9.,.,.40(
Page 83 and 84:
Supersedes all previous issues of P
Page 85 and 86:
.. Rep . 10-41 TYPE 3C -2 REGISTER
Page 87 and 88:
Description INDEX x - What to do If
Page 89 and 90:
I-DE SCRIPTION -...,. 1- Th e type
Page 91 and 92:
"P '"'' 10-Mounting of Cabinet III-
Page 93 and 94:
. r \... 14- Pre liminary Tests """
Page 95 and 96:
Open the a-c . sw itch, operate se
Page 97 and 98:
" V-ARRANGEMENT OF PRINTING AND COL
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(2) Operate il Se lec torl! switch
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IX-SENSITIVITY OF CON'rROL 30 - As
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X-l,mAT TO DO 11" EQUIPMENT DOES NO
Page 105 and 106:
XI RENK[A L PARTS 37 - Type SC -2 S
Page 107 and 108:
c c Supersede. Is.ue Dated February
Page 110:
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