Method For Controlled Braking Of A Door And Device For Applying Said Method

Abstract

The invention relates to a method for controlled braking of an electrically powered lifting action in the event of a failure, such that at least one of the nominal values for “rotational direction” and/or “operating speed” and/or “door position” and/or “motor capacity” and/or “motor current” is ascertained and compared with an actual value, and such that a motorized braking process or motorized stopping process is triggered by a departure of the actual value from the nominal value that lies outside a predetermined range. In addition the invention relates to a device for applying said method.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic view of a door installation with a rolling door and an electromechanical brake.

FIG. 2 shows a schematic view of a door installation with a balancing device.

DETAILED DESCRIPTION OF THE INVENTION

A door controller 1, which includes a frequency converter 3 and a control device 2, is depicted in FIG. 1. In normal operation the frequency converter 3 receives from the control device 2 an input for the frequency and rotational direction that are to be outputted and with which an electrical power unit 5 can be fed, which is mechanically connected with a door shaft 7 by means of a driveshaft 8 and on this path can set a door hanging 9 in motion.

The control device 2 can constantly be informed of the actual position and speed of the door power unit 5 and of the door hanging 9 that is mechanically coupled with it by means of a position sensor 4, which can be positioned between the electrical power unit 5 and the door shaft 7 or on or at the door shaft 7 or can be integrated in the electrical power unit 5 or positioned at another point, and which can take the form of an absolute value indicator or an incremental indicator.

The inventive control device 2 is a component of the door controller 1 and is depicted only in schematic form, because it is combined as a software module in the logical pathways.

The control device 2 in any case is contained in the door controller 1 and according to the invention only assumes additional tasks.

The inventive control device 2 processes the current nominal values for “rotational direction” and “travel speed” that are present internally and compares them with the actual values of the data provided by the position sensor 4, from which the rotational direction and the momentary speed of the gate power unit, in addition to the instantaneous door position, can be ascertained.

e 2 detects a difference that lies outside a previously defined range, then the control device 2 operates the frequency converter 3 and gives the frequency converter 3 a frequency input of 0 Hertz (Hz) in order to drastically reduce the speed of the electrical power unit 5 or to bring it to a stop. At the same time the inventive control device 2 operates a braking device 6 so that this device can support the braking process. This braking device 6 is configured as an electromechanical braking device.

In the embodiment of the door installation depicted in FIG. 1, the inventive method can also be applied to monitor the functioning of the power unit 5. In the event that the power unit 5, for instance because of mechanical ware of the door hanging 9, cannot be moved or held in the required manner, at any time the braking device 6 can be powered by the inventive control device 2 in order to brake the door hanging 9.

In the door installation shown in FIG. 2, we see a balanced door installation in which a balancing device 10 is configured as a counterweight, which is suspended by a cable and whose mass corresponds approximately to the mass of the door hanging 9. In the event that the balancing device 10 should be defective, for instance because of a worm cable, the door hanging 9 would move downward more or less unbraked.

In comparing the nominal values with the actual values, if the control device 2 detects an unintended motion of the door, which lies outside a previously defined range, the control device 2 gives the frequency converter 3 a frequency input of 0 Hertz (Hz) in order to drastically reduce or bring to a standstill the speed of the electrical power unit 5.

The electrical power unit is not of such dimension, as a rule, that it can hold the full load of a defective door mechanism. Thus in an advantageous embodiment it is foreseen that the control device 2, after detecting a defect, moves the door in slow motion into a safe resting position, which for instance can be the closed position of the door, which depends on the type of door, but can also be a different position.

Claims

1. A method for safe braking of an electrically powered door in the event of a defect, characterized in that at least one nominal value for “rotational direction” and/or “travel speed” and/or “door position” is ascertained and is compared with an actual value; that the actual values for “rotational direction”, “travel speed”, and/or “door position” are ascertained by at least one position sensor; that in the event of a difference between the actual value and the nominal value that lies outside a predetermined range, a motorized braking process or a motorized stopping process is triggered; and that the comparison between nominal and actual value is permanently carried out.

2. A method according to claim 1, characterized in that in the braking or stopping process a frequency input of 0 Hertz to 20 Hertz (Hz) is predetermined in a frequency converter and that with this direct current an electrical power unit is fed which contains an asynchronous AC induction motor.

3. A method according to claim 1, characterized in that in a braking or stopping process an electromechanical braking device is actuated.

4. A method according to claim 1, characterized in that after a braking or stopping process the door is brought into a safe holding position.

5. A method according to claim 4, characterized in that the motion of the door occurs by means of a frequency input from a control device to the frequency converter.

6. A method according to claim 1, characterized in that the control device executes a signaling process during and/or after the triggering of the braking or stopping process.

7. A method according to claim 1, characterized in that the control device triggers a braking or stopping process during a start and/or stop ramp.

8. A device for applying the method according to claim 1, characterized in that the device comprises a control device that is configured as a control device that executes a comparison of nominal and actual value, and that is configured as a control device that gives a frequency input to a frequency converter.

9. A device according to claim 7, characterized in that the device comprises an indicator module for indicating a defect.

10. A device according to claim 8, characterized in that the indicator module is integrated in the control device.

11. A device according to claim 8, characterized in that an electrical braking device is provided.

12. A device according to claim 9, characterized in that the indicator module is integrated in the control device.

13. A device according to claim 9, characterized in that an electrical braking device is provided.