JPH073800Y2 - Order thrower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a sequential insertion board provided in a distribution board or the like of a computer system.

(Prior Art) Generally, a computer system is provided with a large number of devices, and power is supplied to these devices through a distribution board. Since a rush current flows to these devices when the power is turned on, if all the devices (all loads) in the system are turned on at the same time, the rush currents of each device will be added and a large current will flow, exceeding the power supply rating. become.

For this reason, the distribution board is provided with a sequence closing circuit in which each device is divided into several groups and the groups are provided with a time lag to sequentially turn on the power.

In a conventional sequence closing circuit, for example, as shown in FIG. 2, a plurality of timer relays T ₁ T ₂ ... Tn and electromagnetic contactors X ₁ X ₂ ... It is connected.

When the power of a distribution board (not shown) is turned on, first, the timer relay T ₁ is activated to turn on its contact t ₁ , and the electromagnetic contactor X ₁ connected in series with this is excited to make its contact x ₁ When turned on, the electromagnetic contactor X ₁ is held and the corresponding load is turned on.

After this, after a lapse of a predetermined time, the timer relay T ₂ is activated and its contact t ₂ is turned on, the electromagnetic contactor X ₂ is held in the same manner, power is supplied to another load, and so on. It is thrown in.

When a momentary power failure occurs and all of the electromagnetic contactors X ₁ X ₂ ... Xn are restored, the power is shut off, the same operation as above is performed again after the power is restored, and the sequence is turned on again. Has become.

However, all electromagnetic contactors X ₁ X ₂ ... Xn do not recover even if a momentary power failure of about several ms occurs, so if only an external load detects a momentary power failure and a power failure occurs, the sequential closing circuit holds Since the power remains on, there is a problem that after the power is restored, the external loads are turned on all at once and a large rush current flows.

In addition, if the performance of the electromagnetic contactors X ₁ X ₂ ... Xn varies and if they are partially retained without recovering after a power failure, there is a drawback that normal ordering after power recovery is not possible. there were.

(Problems to be solved by the invention) The present invention eliminates the above-mentioned drawbacks and resets all the sequence input circuits at momentary power failure even if there are variations in the performance of the electromagnetic contactor, and ensures sequence input again after power recovery. The purpose is to provide a possible sequential loading board.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a sequential closing circuit including a plurality of timer relays and a plurality of electromagnetic contactors for opening and closing the power source of an external load corresponding to the timer relays. A power failure detection relay and a start relay are connected in parallel between the control power sources, and the time contact of the start relay is connected in series with the sequence closing circuit, and the power failure detection relay a is connected in parallel with the time contact. A contact is provided, the b contact of this power failure detection relay is connected in series with the starting relay, and the contacts of each electromagnetic contactor of the sequence closing circuit are respectively connected in series with the power failure detection relay. Is.

(Operation) The sequencer board of the present invention is provided in the distribution board, and when the starting relay is excited and its contact is turned on, the timer relay and the electromagnetic contactor of the sequencer circuit connected in series with this are sequentially operated. Then, the power is sequentially turned on to the respective loads corresponding to the respective electromagnetic contactors, and the sequence closing circuit is held.

At this time, the b contact is turned off by the power failure detection relay connected in series with the contact of each electromagnetic contactor, the starting relay is released, and the a contact is turned on to hold the sequence closing circuit.

When a momentary power failure occurs and any one of the electromagnetic contactors corresponding to each load is restored, its contact is turned off, the power failure detection relay is restored, and its a contact is turned off to control power supply. Is shut off and the sequence closing circuit is surely reset, and after the power is restored, the starting relay operates and the sequence can be closed again.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIG.

Reference numeral 1 is a sequence closing circuit, in which a plurality of timer relays T ₁ T ₂ ... Tn each having a different operating time and a plurality of electromagnetic contactors X ₁ X ₂ ... Xn for opening and closing the power source of each load are connected in parallel, wherein each contact t ₁ t ₂ ... tn of the timer relay T ₁ T ₂ ... Tn are connected respectively corresponding to the series with the electromagnetic contactor X ₁ X ₂ ... Xn.

The sequence closing circuit 1, the power failure detecting relay Y, and the starting relay Z are connected in parallel between the control power sources PN.

Further, the power failure detection relay Y is connected in series with each contact x ₁ ′ x ₂ ′ ... xn ′ of the electromagnetic contactor X ₁ X ₂ ... Xn. Further, the a contact ya of the power failure detection relay Y is connected in series with the sequence closing circuit 1, and the other b contact yb is connected in series with the starting relay Z.

Further, the time-delayed contact z ₁ of the starting relay Z is connected in parallel with the a-contact ya.

Next, the operation of the above-mentioned sequential charging board will be described. When power is supplied to a distribution board (not shown), the starting relay Z
Is excited, the time-delayed contact z ₁ is turned on, the timer relay T ₁ of the sequence closing circuit ₁ is activated, and the contact t ₁ is turned on. As a result, the electromagnetic contactor X ₁ is excited and the load corresponding to this is turned on.

Then, after a predetermined time has elapsed, the timer relay T ₂ is activated, its contacts t ₂ is turned on to excite the electromagnetic contactor X _2, until the electromagnetic contactor Xn in the same manner power is supplied to the load The power is sequentially turned on by sequentially exciting the corresponding loads.

In this case each of the electromagnetic contactor X ₁ X ₂ ... contact x ₁ of Xn 'x _2' ... xn 'also continue to sequentially turned on, xn' is excited power failure detection relay Y when on the a-contact ya Is turned on, the b-contact yb is turned off to release the starting relay Z, and the time-delayed contact z ₁ is turned off to hold the sequence closing circuit 1.

When a momentary power failure occurs and any _{one of the} electromagnetic contactors X ₁ X ₂ ... Xn is released, at least one of its contacts x ₁ ′ x ₂ ′ ... xn ′
Is turned off, and the power failure detection relay Y is restored. As a result, the a-contact ya is turned off, the b-contact yb is turned on, and the sequence power supply circuit 1 is turned off by the control power supply.

In the case of reclosing after the power is restored, the contact b yb is in the ON state. Therefore, if the starting relay Z is operated, the sequence closing circuit 1 is surely operated and is in the holding state as in the above case.

The reason for using the time delay contact z ₁ as the contact of the starting relay Z is that when the time from power failure to power recovery is a short time of several ms,
This is to provide a pause time for restarting after the external load is completely stopped.

Further, in the present invention, the sequence input circuit 1 is not limited to the above-mentioned configuration, and may have another circuit configuration such as an auxiliary relay added.

[Effects of the Invention] As described above, according to the present invention, if at least one of the electromagnetic contactors recovers during a momentary power failure even if there are variations in the performance of the electromagnetic contactor, all of the sequence closing circuits are reset and after power recovery, Therefore, it is possible to obtain an order-discharging board that can surely perform order-discharging again.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a sequential loading board according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional sequential loading circuit. 1 ... Sequence closing circuit, Y ... For power failure detection relay Z ... Starting relay T ₁ , T ₂ , Tn ...... Timer relay X ₁ , X ₂ , Xn ...... Magnetic contactor x ₁ , x ₂ , xn, x ₁ ′, x ₂ ′, xn ′ …… contact t ₁ , t ₂ , tn, ya, yb …… contact

Claims (1)

[Scope of utility model registration request] 1. A sequence interruption circuit comprising a plurality of timer relays and a plurality of electromagnetic contactors for opening and closing a power source of an external load corresponding thereto, a power failure detecting relay between control power sources,
In parallel with the start-up relay, the time-delay contact of the start-up relay is connected in series with the sequence closing circuit, and the a-contact of the power failure detection relay is provided in parallel with the time-delay contact. An order insertion board characterized in that contacts are connected in series with a start-up relay, and contacts of each electromagnetic contactor of an order insertion circuit are respectively connected in series with a power failure detection relay.