DE647955C - Switching device for master clocks - Google Patents

Description

Switching device for master clocks The invention relates to a an operating master clock - hereinafter referred to as the master clock - and a reserve master clock - short reserve clock - existing master clock system for pulse-wise switching of NetJenuhren. There are already facilities known in which in the event of a malfunction one of the two master clocks a switchover of the undisturbed master clock to the clock network and the faulty master clock is switched off. In these known facilities the checking of the contact of the master clocks and the switching and disconnection of the same takes place by a stepping mechanism influenced by both master clocks. This arrangement has some disadvantages, however, which manifest themselves in the fact that when properly working Master clock a fault in the reserve clock has an incorrect effect on the clock pulse generation and that the stepping mechanism in an extensive clock network because of the result is easily exposed to interference caused by high currents.

The invention avoids this disadvantage and also achieves one considerable simplification and cheaper by using one of several simple Relay existing relay chain that is switched using holding circuits is that the contacts of both master clocks in terms of their sequence and duration monitored, when properly. Alternating operation the transmission of the current impulses to the slave clock network and, if a master clock malfunctions, also this Master clock is instantly made permanently ineffective for the clock system. the Reduction is mainly due to the exclusive use of series manufacturable switching means achieved the self-connection technology.

The figure shows an embodiment of the invention. HU, and HU, are the pulse contacts of the master clock that are effective one after the other at the same time intervals, RUl and RU2 are the corresponding ones of the reserve clock. The order in which the four contacts are briefly closed is as follows: First HUI, after 5 seconds RUl, after 1 minute -HU, and seconds after HU, the contact RU, the movable springs of the four contacts are each with a relay A, B, C and D connected; the working springs of the master clock contacts are connected to one another and via the normally closed contact u1 of the master clock switch-off relay U in series with the contact -51 of a manual switch with the positive pole. The working springs of the reserve clock contacts are also connected to the positive pole via the normally closed contact v1 of the reserve clock cut-off relay V in series with the manual switch T1. The A relay is connected to the negative pole via contact b2, the B relay via a2, C via d2 and D via c2.

On the switching of the relay group, which consists of the switch-off relay U and V and the control relays X, Y and Z is in the description their '' mode of action. The X relay connected directly to the negative pole is delayed release.

The auxiliary relays E and F transmit in a known manner; not shown the current impulses of different polarity on the slave clock system: The E-relay is de-energized U-relay by the A-relay, with energized U-relay by the C-relay actuated; accordingly, the F relay is switched on by the B or D relay, depending on whether the U relay is energized or de-energized. U and V relays switch through the 2i, - resp.

Contact signaling devices, which are represented by the signal lamps L1 and L2 and the `delicious TV, and TV.

The mode of operation is based on five operating states of the system described, firstly for normal operation, secondly for the operational case, that the contact is not made by the master clock, thirdly with permanent contact of the Operational master clock, fourthly if there is no contact from the reserve master clock and fifth with permanent contact of the reserve master clock.

As already mentioned, the main and reserve clocks work with a rate difference of 5 seconds. Closing the HUl contact energizes the A relay (+, S1, u1, HUl, A, bI, -), which switches its contact a1, a, opens and a, closes. Kontakta transmits the impulse with a certain current direction to the slave clock lines by energizing the E relay (-L, E, a3, u3, S3, -). By switching over the contact a1, the X relay is energized (-, X, all Z% 2, u2, -f-), which closes its contact x1. If the A relay is de-energized again by reopening the contact HU, the X relay is also de-excited. However, the Y-relay lasts for some time due to its drop-out delay, so that the Z-relay is excited via the short-term current path (f-, lt-, v2, a1, b1, x1, Z, S2, TI, -). The Z relay stays in the circuit (+, "2, v2, z2, y2, Z, S2, T2, -) via its own z2 contact.

After about 5 seconds the contact RUl closes and energizes the C relay (-f-, T1, v1, RUl, C, d2, -). By closing the cl contact, the Y relay receives power from (-E-, u2, v2, cl, z3, Y, SI, TI, -). Contact y2 is opened so that the holding circuit for the Z relay is disconnected. By opening contact RUl, relay C is de-energized, which by opening contact Cl makes the Y relay vI, cl, y ", Y, S, T z, -) de-energized. After x minutes, contact HUI closes and brings that B-relay energized (-E-, S1, u1, HUI, B, a2, -). The F-relay is energized by the b3 contact (-E-, F, b3, u3, S3, -), which again sends a current impulse, but of reverse polarity, into the slave clock system. The bi contact energizes the X relay (-, X, b1, a1, v2, u2, -f-). By opening the -'U2- Contact and the de-excitation; -the B-relay is excited via the bi contact the Z-Re-IaYs (-f-, u2, v., All b1, x1, Z, S2, T2, by the closing after 5 seconds of the RUZ contact, the D relay is energized, which in turn causes the Y relay to respond (-t-, u2, v2, dl, z3, Y, S2, T2, -). The Y relay disconnects again through its y . -Contact opens the holding circuit of the Z-relay (-f-, u2, v2, z2, y2, Z, SI, T2, -). If the RUZ contact opens, the D-Rel ais de-excited and thus the holding circuit for the Y relay (+, uI, v2, dl, y3, Y, S2, T2, -) is disconnected. The operating state assumed at the beginning of the description is thus achieved again.

The operational case is now assumed in which the master clock does not make contact. As a result of the lack of contact by HU, relays A, Y and Z remain de-energized. When contact RUl closes, the C relay is in turn energized (-E-, T1, v1, RUl, C, d2, -), which causes the master clock switch-off relay U to respond (+ 1, U2, v2, cl, z3, y4, U, S2, TI, -). The U relay maintains its own u4 contact via the holding circuit (-f-, u4, y4, U, S2, T2, -). The pulse contacts HU and HU of the master clock are switched off by contact u1. The contact u2 separates the relay group X, Y, Z, V. The contact US brings the E and F auxiliary relays depending on the relays C and D. Through the contact u ,; the signal lamp L1 and the alarm clock TV are switched on so that the monitoring staff is informed of the malfunction. By moving the manual switch with the individual contacts S1, S2, S3, the U relay is switched off while maintaining the previous operating status. The further, 5 seconds delayed impulses are triggered by the contacts RU1 and RU2 of the reserve clock.

If the main clock is in permanent contact, the pulse contact HU, is closed for a longer period of time so that the A and X relays also remain energized (-i-, S1, u1, HUl, A, b2, - ) (- X, all v., u2, -f-). As a result, the Z relay is de-energized when the contact closure of RUl and thus the excitation of the C relay takes place, so that the U relay is energized (-1--, u2, v2, Cl, x3, y4, U, S2, TI, -), which switches off the master clock in the manner described above.

If the contact of the reserve master clock fails, the contact RUl is not closed and the C relay is therefore not energized. When the HU $ contacts close, the Z relay is still energized (-E--, 142, va, z2, y2, Z, S2, TI, -). The B relay now switches on the relay V, which switches off the reserve clock via the bl contact (-f-, u2, v2, all b1, y1, z1, V, S2, T2.-), which is activated via its own holding contact v3 holds (+, v3, V, S2, T2, -). By. the vi contact, the pulse contacts RUl and R U2 of the reserve clock are switched off. The v2 contact separates the common connection for the relay group X, Y, Z, U , the v4 contact switches on the signaling means L2 and WZ, so that the monitoring staff is informed of the faulty reserve master clock. By moving a manual switch with the individual contacts T1, TZ, the V-relay is de-energized, but the operating status of the system is maintained.

If the reserve main clock is in permanent contact, the RUl contact remains closed for a longer period of time; C and Y relays therefore also remain energized for a longer period of time (+, T1, ml, R U1, C, d2, -) (+, u2, v2, Cl, y3, Y, S2, T2,). If the pulse contact HU of the main operating clock is closed and B is excited, the V relay is energized again (+, u2, v2, a1, b1, y1, V, S2, T2, -). The switch-off of the reserve clock and the signaling of the operating status takes place in the manner described above.

The device described above can of course also can be used for systems with half-minute or otherwise selected contact.

Claims (6)

PATENT CLAIMS: e.g. Circuit arrangement for monitoring a slave clock system controlled by two master clocks, in which, if one master clock fails, the other master clock takes over the switching of the slave clocks, characterized by a relay chain consisting of several simple relays, which is influenced alternately by the two master clocks (HUl, HU, RUl, RU2) (X, Y, Z, U, V, E, F), which is switched using holding circuits in such a way that the contacts of both master clocks are monitored with regard to their sequence and duration If a master clock malfunctions, this master clock is instantly and permanently switched off by the system. 2. Circuit arrangement according to claim x, characterized in that that the first of a non-disturbed master clock after failure of a current pulse or after the occurrence of a current pulse for too long an outgoing current pulse Contact of the relay chain activated, which identifies the faulty master clock and the switching of the slave clocks depending on the non-disturbed master clock causes. 3. Circuit arrangement according to claim z, characterized in that both the onset and termination of a current pulse in normal operation of both master clocks causes switchovers in the relay chain. q .. Circuit arrangement according to claims z to 3, characterized in that the rate difference between the two Master clocks is greater than the time that the duration of a current pulse when properly Corresponds to operations of the master clocks. 5. Circuit arrangement according to claim z, characterized characterized that in the relay chain in addition to the circuits necessary in the event of a fault Carrying out fault relays (U, V) further relays are provided, depending on influence the circuits of the fault relays differently from the incoming impulses. 6. Circuit arrangement according to claim z to 5, characterized in that each A signal means (L1, L2) is assigned to the master clock, which in the event of a malfunction indicates whether the operating or reserve master clock is faulty.