Patent GB-397118-A (GB)
Title: Improvements in or relating to electrical remote control and indication
IPC: H02J13/00
Filed: 1932-02-13
Abstract: 397,118. Electric selective signalling and remote control systems. STANDARD TELEPHONES & CABLES, Ltd., McWHIRTER, E. M. S., FLINT, J. G., and WHITE, C. G., Connaught House, Aldwych, London. Feb. 13, 1932, No. 4291. [Class 40 (i).] In an electric selective signalling and remote control system in which selection is performed by the transmission of a constant number of impulses divided into a number of digits, the digits are received in turn on a counting mechanism, all digits but the last are transferred, as each digit is completed, to registers, the position of each register as it is set is checked against the position of the counting mechanism, and as each register is moved, a totalling register is also operated, the final selection or operation being completed only if each register has checked correctly against the counting mechanism and the number of impulses recorded on the totalling register plus the impulses comprising the final digit equals the said constant number. When used for the remote control of apparatus, either the operation can be performed immediately the selection is completed or the selection car be held whilst a confirmatory, code is transmitted to the controlling office, a further signal being required to complete the control. The transmitter comprises a common impulse transmitter coupled to a number of shading cams, the code transmitted being determined by the cams selected. The apparatus at one substation only is indicated in the Figures, the apparatus being coupled to the main statior over the two-wire line L1, L2 marked 133 The total number of digits for the system described is thirteen, divided into four groups, no group exceeding 7 digits. Transmitting apparatus (Figs. 2, 9, and 10). When the circuit-breaker associated with 201, Fig. 10, closes AS prepares the circuit for IA which circuit is completed over cam C10 of SM10 if, or when, SM10 is normal. IA locks and as OA is also locked up SM9 is operated (over B9, ha2, oa1) and drives in search of the calling unit. When SM9 reaches its seventh position HA and BA are operated in series over Q9, HA opening the circuit of SM9 and, if SM1 is normal, closing that of SM10. As SM10 moves off normal, the holding circuits of OA and IA are opened, OA releases but IA remains energized. When BA pulled up it prepared marking circuits to shading cams f, p and wand as shown clearly in Fig. 9, this marking gives a code of 6 breaks (1 .. 6), a make (cam f), four breaks (13 .. 16), a make (cam p), one break (23), a make (cam w), two breaks (30 and 31) and a final make. Switch SM10 moves through a complete cycle, IS operating over cam H10 to send impulses to the lines L1, L2 according to the code indicated above, the relay being shorted-out when the shading cams are connected. When the switch reaches its 18th position SM11 is moved off normal (over D10) and holds IS operated (over C11) until it reaches its position 15¢ to ensura a long final make. SM11 homes over A11. When SM10 homes BA and HA fall away and SM9 homes. Receiver. The receiver (shown in Fig. 1) comprises eight sequence switches SM1 .. SM8 and a set of impulse receiving relays CA .. CG. Impulses are received over L1, L2, Fig. 3, and energize one of the relays IR, Figs. 3b, c or d). RG, Fig. 1, pulls up and SM1 moves into position 2, DC, DCA and DCB energize in chain. When the first break is received PO pulls up and CA is energized, CA preparing the circuit of CB and PO that of POA and SM1 moves to position 3¢. When the break terminates POA energizes in series with PO and prepares the circuit of PE. On the second break PE pulls up, opening the circuit of PO which releases and CB pulls up and locks in series with CA. On the next break PO again pulls up and CC is energized and the cycle is repeated PO energizing on the odd breaks and PE on the even ones whilst the relay chain CA . . CG counts the pulses. It is assumed that five impulses are received so that relays CA, CB will be energized and during the interdigital pause DC, DCA, and DCB release and SM1 drives to position 6. When SM1 moved to position 3¢ a circuit was completed from ca2 to drive SM2 to its second position and as each of the counting relays CB, CC, &c. pull up SM2 moves still further until, as CE is the last relay energized, it stops in its sixth position. At the same time SM8 is pulsed over E2 and advances to its sixth position. As stated above, when the digit has terminated SM1 drives to its sixth position but as it passes through position 5“ a checking circuit is completed from E1 over cal - cel (operated) and cf (back) G8 and G2 (5¢-6) to energize VM which locks up. As SM1 passes out of 5“ relays CA .. CE and PO, POA are released. The second digit (assumed 4 impulses) is also received on the relays CA-CD, SM3 is set to its fifth position and SM8 to its tenth. When the digit terminates SM1 drives to position 10, checking in position 9“ the correspondence between SM3 and the hundreds digit received by energizing VH from E1. The third digit of three impulses is similarly received, is registered on one of the registers SM4 .. SM7, the particular register used being determined by the thousands digit, SM8 is set to its thirteenth position and the circuit through E1 is again completed to check correspondence between the register and the counting relays, VT being energized and locked. The final digit (one impulse) is stored on the register chain only and when the digit terminates SM1 drives to position 18. As SM1 moves through positions 15“-16¢ a circuit is completed to operate unit 5431 over E1, cal, cb1 (back), D8 (position 13), T1, vm2, vh2, vt2, 109 (Fig. 6), 02 (in 6) T3, U3 (cut in 5), R6 (cut in 4) to the unit. When SM1 reaches position 18 and the final impulse ceases, R6 falls away SM1 homes, all operated relays release, and all offnormal switches drive to normal. Indication of incorrect code. If incorrect codes are to be indicated, the final circuit from E1, Fig. 1, is altered by removing the connections below 110 and connecting to VU, Fig. 11. VU energizes if the code is true and the unit selected is operated over 211. If the code is false one of the relays VU, VM, VH, VT will be back and an indication extended over 212. System using pre-selection. The circuit shown in Fig. 1 is modified by the addition of Fig. 4 whilst the receiving relay arrangement, Fig. 3 (d) is used, IR being biassed to operate when potential is connected to L1, L2 in one sense and IF when this potential is reversed. The selecting digits (assumed to be 2173) are transmitted and set the receiving equipment as before described but when the final digit has terminated and DCB releases, SM1 is driven to position 16¢. PM and HA operate in series over the circuit from E1 and 109 and SL operates over 141 and remains up until IR falls away indicating a clear line. When IR releases, SL falls away and SM10 operates over XI (in 16¢) whilst PM has marked shading cams a, h, s over cams R2, N3, and X8 of switches SM2, SM3 and SM8 (which were set by the received code). Consequently SM10 transmits the preselection code (in this case 1156) to the control station. During the sending period, as SM10 and SM11 are off-normal, the receiving relays IR, IF are disconnected. When SM10 reaches position 18, SM11 obtains a driving circuit from D10 and moves to position 6 whilst SM10 homes. The signalling circuit is now recompleted and the operator, having received the correct confirmatory signal, reverses the line potential to energize IF and FR (Fig. 4) energizes and locks to G11. If the operating voltage varies from that of the normal receiver voltage the system of Figs. 7 and 8 apply, IF energizing TA over Y2 and 172, and TA applying the required higher potential from 171 via tal and cams of the operated sequence switches. If, on the other hand, the same voltage is to be used 172, Fig. 8, is connected direct to 173, Fig. 7, and TA is not brought into the operation. When the operating pulse is removed from the line, IF releases, TA falls away, SM1 drives to position 18, and the operated equipment releases as before described, SM11 homing when SM1 is again normal. Indication involving storage of code markers. For certain initial digits (3 and 4 as described) the final code marker can be held energized whilst the rest of the equipment is released. Fig. 5 provides for this arrangement and RK is operated. When the operating potential is extended to 109 MA and HG operate, locking, when the operating potential is removed, to MD. These relays, and the tens digit switch used are held operated until released by RK whilst the rest of the receiving equipment is released in the manner detailed above. RK also supplies the potential for operating the selected unit. Time release. Should the receiver be held for more than a predetermined time TMR is operated to give an alarm over 101 and release the signalling relay IR, IR being a polarized relay, as shown in Fig. 3b, when this facility is required.