JPH0893362A - Cooling fan for frequency conversion circuit device in electric switch - Google Patents

Abstract

PURPOSE: To extend the service life of a cooling fan installed to a frequency conversion circuit device. CONSTITUTION: A cooling fan 9 is connected to a circuit which leads to a frequency conversion circuit device 5 from a power source in such a fashion that it may be installed in parallel to the frequency conversion circuit device 5 while a relay 10, which is excited accompanied by an ON operation of a raising pushbutton switch PBU or a lowering pushbutton switch PBD of a switching device 2 and excited and released by an OFF operation of the pushbutton switches, is connected to a switching drive control circuit 6. A switching contact 10a, which follows the excitation of a relay 10 and switched ON and switched OFF after a specified lapse of time by excitation release, is installed to a circuit of a cooling fan 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling fan for a frequency conversion circuit device in an electric switch for opening and closing an opening.

[0002]

BACKGROUND OF THE INVENTION Generally,
In this type of electric switchgear, an opening / closing member provided in the opening is moved up and down by driving a switchgear whose speed is controlled based on an output from a frequency conversion circuit device which receives a signal from an opening / closing control circuit based on an operation signal. There is a type that employs an inverter control system that is operated to open and close. And in this thing, it is necessary to cool the output semiconductor element provided in the frequency conversion circuit device, and the cooling fan for that is provided. By the way, conventionally, this cooling fan
Since it was configured to always drive with the power supply connected,
Its life is short, and there is a problem that it must be replaced frequently due to regular maintenance.

Therefore, it is conceivable that the cooling fan is turned on and off based on the presence or absence of the output of the frequency conversion circuit device, but the output semiconductor element must be cooled even after the output is stopped. It cannot be adopted.

[0004]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a cooling fan for a frequency conversion circuit device in an electric switchgear capable of eliminating these drawbacks in view of the above-mentioned circumstances. In addition, the drive control of the opening / closing device for opening / closing the opening / closing body provided in the opening is
In an electric switchgear configured to perform based on an output from a frequency conversion circuit device that receives a signal from an opening / closing control circuit based on an operation signal, a cooling fan for cooling the frequency conversion circuit device is provided with respect to a power source. The frequency conversion circuit device is connected in parallel, and the power supply circuit reaching the cooling fan is closed upon detection of the output operation state of the frequency conversion circuit device, and the frequency conversion circuit device outputs. It is characterized in that a switch contact is provided which opens with a delay in response to detection of the stop state.

According to the present invention, it is possible to reliably extend the life of the cooling fan while reliably cooling the output semiconductor element by the cooling fan.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a shutter curtain of a shutter device installed in an opening of a building, and the shutter curtain 1 is wound around a winding drum 3 which rotates in accordance with forward and reverse driving of an opening / closing device 2. , It moves up and down by being rewound, so that the shutter curtain 1
The structure is such that the opening is opened and closed while being guided by the guide rails 4, but these structures are all conventional.

Shutter curtain 1 by the opening / closing device 2
The opening / closing drive control of is explained based on the control circuit diagram of FIG. Here, R, S, and T are the respective phases of the three-phase AC power supply, and power is supplied to the switchgear 2 via the main switch MSW. The frequency conversion circuit device 5 is provided in the power supply circuit up to. This frequency conversion circuit device 5
Can adopt a generally known general-purpose device such as a VVVF inverter device. In short, the frequency conversion of the power supply current is performed from the switching drive control circuit device 6 configured by using a microcomputer. It is designed to be performed based on the control command of. The open / close drive control circuit device 6 includes push-button operation switches PB for raising, lowering, and stopping.
U, PBD, PBS, limit switch LS for upper and lower limits
U, LSD, ascending and descending deceleration position detection switches 7,
8. Various switches such as the obstacle detection switch SFT are connected.

Further, 9 is drawn from a circuit from the power source E to the frequency conversion circuit device 5, and the frequency conversion circuit device 5
A cooling fan connected in parallel with the cooling fan 9
Is for cooling the output semiconductor element 5a provided in the frequency conversion circuit device 5. The switch circuit 10a of the time-reset type relay (relay) 10 is connected to the power supply circuit reaching the cooling fan 9. ing. In other words, since this relay 10 is a time-reset type, ON switching of the switch contact 10a is performed simultaneously following the excitation of the exciting coil, but OFF switching is delayed by a preset timer time. It is set to be done.

The details of the open / close control procedure in the open / close drive control circuit device 6 are omitted here.
Basically, when an operation signal is input from the up push button switch PBU or the down push button switch PBD, an open drive command or a close drive command is output to the frequency conversion circuit device 5, and the frequency conversion circuit device is output. In 5, the frequency-converted power supply current is output to the switch 2 based on the control command, and the power supply current is stopped based on the input of the operation signal of the stop push button switch PBS. . Needless to say, various safety controls such as emergency stop due to obstacle detection are also performed.

Next, an example of a drive control procedure for the cooling fan 9 will be described with reference to the flow chart shown in FIG. Here, first, the push button switch for lowering PBD
Alternatively, it is determined whether or not there is an operation signal from the push-up switch PBU for raising, and when it is determined that the operation signal is present, a control command for closing the switch contact 10a is output to the relay 10, and by this, Switch contact 1
0a is switched to ON, and the power supply circuit of the cooling fan 9 becomes a closed circuit and rotates. On the other hand, it is determined whether or not the output from the frequency conversion circuit device 5 is stopped. This determination is made in accordance with the input of the operation signal of the stop push button switch PBS, and the limit is set when the shutter curtain 1 reaches the upper and lower limits. There are various judgments such as the opening of the switches LSU and LSD, the presence of the obstacle detection by the obstacle detection switch SFT, and the like. The frequency conversion circuit device 5 is based on one of these determinations. On the other hand, a drive stop command is output, and a control command for turning off the switch contact 10a is output to the relay 10, whereby the switch contact 10a is turned off as the timer time elapses. It is set so that the driving of the cooling fan 9 is stopped.

In the embodiment of the present invention configured as described above, the opening / closing drive of the shutter curtain 1 is performed by operating the push button switches PBU and PBD for raising and lowering. In that case, the shutter is opened. The opening / closing speed of the tar curtain 1 is controlled to be increased-constant speed (high speed) -deceleration based on the frequency control by the frequency conversion circuit device 5.

In the case where the opening / closing drive speed control of the shutter curtain 1 is performed based on such frequency control, when the shutter curtain 1 is driven to open / close or close, the switch contact 10a is switched to the ON state based on this. As a result, the cooling fan 9 is driven to cool the output semiconductor element 5a of the frequency conversion circuit device 5. When the shutter curtain 1 reaches the upper and lower limits and the output from the frequency conversion circuit device 5 is stopped,
The shutter curtain 1 stops, but the cooling fan 9
After that, the semiconductor element 5a for output is cooled by continuing to drive for the timer time, and then the switch contact 10a is turned off and stopped.

As described above, in the embodiment of the present invention, the cooling fan 9 continues to be driven for a while after the output from the frequency conversion circuit device 5 is stopped. The output semiconductor element 5a is not left in a hot state unlike the case where the output of the device 5 is stopped and the drive is stopped, and the element 5a can be reliably protected. Moreover, since the cooling fan 9 is automatically stopped after the output semiconductor element 5a is cooled, it is possible to prevent wasteful power consumption as in the case where the cooling fan 9 is continuously driven, and the cooling fan 9 can be prevented.
Therefore, the service life can be extended and the maintainability can be improved.

[0014]

In summary, since the present invention is constructed as described above, the shutter curtain is opened and closed based on the output from the frequency conversion circuit device, but the frequency conversion circuit device is cooled. The cooling fan operates along with the output state of the frequency conversion circuit device, and when the output state is stopped, the cooling fan is stopped after a predetermined time delay. During output, of course, it will be cooled for a while even after output is stopped, and it will not be left in a hot state,
The device can be reliably protected. In addition, the cooling fan will automatically stop after cooling the frequency conversion circuit device, avoiding unnecessary power consumption and shortening the life of the cooling fan itself as in the past. Therefore, the maintainability can be improved.

[Brief description of drawings]

FIG. 1 is an overall front view of a shutter device.

FIG. 2 is a control circuit diagram of a switchgear.

FIG. 3 is a block diagram showing drive control of an opening / closing machine.

FIG. 4 is a flowchart showing a control procedure of a cooling fan.

[Explanation of symbols]

 1 Shutter curtain 2 Switcher 3 Winding drum 4 Guide rail 5 Frequency conversion circuit device 5a Output semiconductor element 5a 6 Open / close drive control circuit device 7 Raising / decelerating position detection switch 9 Cooling fan 10 Relay 10a Switch contact PBS Push button switch for lowering

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H02P 7/63 302 S

Claims (1)

[Claims] 1. A structure in which drive control of an opening / closing device for opening / closing an opening / closing body provided in an opening is performed based on an output from a frequency conversion circuit device that receives a signal from an opening / closing control circuit based on an operation signal. In the electric switchgear described above, a cooling fan for cooling the frequency conversion circuit device is connected to the power supply in parallel with the frequency conversion circuit device, and the power conversion circuit reaching the cooling fan has a frequency conversion circuit. A switch contact is provided, which is closed upon detection that the circuit device is in the output operation state, and is opened with a delay with respect to detection that the frequency conversion circuit device is in the output stop state. Cooling fan for frequency conversion circuit device in electric switchgear.