SE8504552D0 - SAFETY DEVICE FOR GLIDDORR OR LIKLY - Google Patents

SAFETY DEVICE FOR GLIDDORR OR LIKLY

Info

Publication number
SE8504552D0
SE8504552D0 SE8504552A SE8504552A SE8504552D0 SE 8504552 D0 SE8504552 D0 SE 8504552D0 SE 8504552 A SE8504552 A SE 8504552A SE 8504552 A SE8504552 A SE 8504552A SE 8504552 D0 SE8504552 D0 SE 8504552D0
Authority
SE
Sweden
Prior art keywords
voltage
safety device
motor
zener diode
analogue
Prior art date
Application number
SE8504552A
Other languages
Swedish (sv)
Other versions
SE461123B (en
SE8504552L (en
Inventor
P Uljens
Original Assignee
Huurre Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huurre Oy filed Critical Huurre Oy
Publication of SE8504552D0 publication Critical patent/SE8504552D0/en
Publication of SE8504552L publication Critical patent/SE8504552L/en
Publication of SE461123B publication Critical patent/SE461123B/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection

Landscapes

  • Power-Operated Mechanisms For Wings (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

This invention concerns a safety device which is used in particular for sliding doors in cold-rooms. The function of the safety device is based on measuring the dynamic input power to the operating motor. The safety device has a three-phase motor and a three-phase inverter bridge 7,9 for control of the motor. The safety unit according to the invention further comprises devices 10,11,12 for generating an analogue voltage in relation to the input power of the motor, an amplification and active low-pass filter unit 14, an analogue memory 15, a Zener diode 18 and a voltage comparator 23. The voltage comparator 23 is connected on the one hand to the analogue memory 15 and on the other hand to the Zener diode 18. This connection is implemented so that when the voltage after the unit 14 minus the voltage 18 of the Zener diode exceeds the voltage in the analogue memory 15 the voltage comparator 23 generates an output signal 32. <IMAGE>
SE8504552A 1984-10-04 1985-10-02 Safety apparatus for sliding doors and the like SE461123B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI843901A FI77548C (en) 1984-10-04 1984-10-04 Safety assembly for sliding door or similar.

Publications (3)

Publication Number Publication Date
SE8504552D0 true SE8504552D0 (en) 1985-10-02
SE8504552L SE8504552L (en) 1986-04-05
SE461123B SE461123B (en) 1990-01-08

Family

ID=8519688

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8504552A SE461123B (en) 1984-10-04 1985-10-02 Safety apparatus for sliding doors and the like

Country Status (2)

Country Link
FI (1) FI77548C (en)
SE (1) SE461123B (en)

Also Published As

Publication number Publication date
SE461123B (en) 1990-01-08
FI843901L (en) 1986-04-05
FI843901A0 (en) 1984-10-04
FI77548B (en) 1988-11-30
SE8504552L (en) 1986-04-05
FI77548C (en) 1989-03-10

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