SE8504552L - SAFETY DEVICE FOR GLIDDORR OR LIKLY - Google Patents
SAFETY DEVICE FOR GLIDDORR OR LIKLYInfo
- Publication number
- SE8504552L SE8504552L SE8504552A SE8504552A SE8504552L SE 8504552 L SE8504552 L SE 8504552L SE 8504552 A SE8504552 A SE 8504552A SE 8504552 A SE8504552 A SE 8504552A SE 8504552 L SE8504552 L SE 8504552L
- Authority
- SE
- Sweden
- Prior art keywords
- voltage
- safety device
- motor
- zener diode
- analogue
- Prior art date
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>
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 SE8504552D0 (en) | 1985-10-02 |
SE8504552L true 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) |
-
1984
- 1984-10-04 FI FI843901A patent/FI77548C/en not_active IP Right Cessation
-
1985
- 1985-10-02 SE SE8504552A patent/SE461123B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI843901L (en) | 1986-04-05 |
SE461123B (en) | 1990-01-08 |
FI77548B (en) | 1988-11-30 |
FI843901A0 (en) | 1984-10-04 |
SE8504552D0 (en) | 1985-10-02 |
FI77548C (en) | 1989-03-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
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