GB873809A - Improvements in or relating to electrical protective systems - Google Patents
Improvements in or relating to electrical protective systemsInfo
- Publication number
- GB873809A GB873809A GB8022/59A GB802259A GB873809A GB 873809 A GB873809 A GB 873809A GB 8022/59 A GB8022/59 A GB 8022/59A GB 802259 A GB802259 A GB 802259A GB 873809 A GB873809 A GB 873809A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- relay
- contact
- energized
- hoist
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 title abstract 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
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
- H02H7/0822—Integrated protection, motor control centres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
Landscapes
- Stopping Of Electric Motors (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
873,809. Control of D.C. motors; controllers. IGRANIC ELECTRIC CO. Ltd. March 9, 1959 [March 10, 1958], No. 8022/59. Class 38 (3). A protective system for a skip hoist driven by an electric motor forming part of a Ward- Leonard set comprises a relay 10 which is connected in series with a group of contacts 12 . . . 26 responsive to conditions damaging to said motor, and with a further group of contacts 28 . . . 48 responsive to excess speed and abnormal location of the load. An emergency brake coil 52 is connected in series with the second group of contacts. Thus, if an overload contact in a set 24 is opened, the relay 10 is de-energized and opens its contact 10. This causes the hoist to stop in a normal manner by decreasing speed and braking. When, however, the hoist-car fails to reduce speed at a slow-down point due to circuitfailure, a contact 30 remains open, and when a limit switch 34 or 36 (depending on direction) opens as the car passes the slow-down point, the coil 52 is de-energized causing quick stoppage by an emergency brake. At the same time, the relay 10 is de-energized. A test light 56 and selector switch 58 is used for finding which of the contacts 12 . . . 26 has been opened. A similar test light 60 and selector switch 62 is used for the contacts 28 . . . 48. After the relay 10 has dropped out, a first attempt at re-energization is made by closing push-button 50. If the stoppage was caused by a momentary opening of a self-setting contact, there is no need to use the faultfinding selector switches.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US720154A US3110019A (en) | 1958-03-10 | 1958-03-10 | Protective system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB873809A true GB873809A (en) | 1961-07-26 |
Family
ID=24892861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8022/59A Expired GB873809A (en) | 1958-03-10 | 1959-03-09 | Improvements in or relating to electrical protective systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3110019A (en) |
| GB (1) | GB873809A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886241A (en) * | 1994-09-16 | 1996-04-02 | Hitachi Ltd | Drive device for sensor and actuator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2736009A (en) * | 1956-02-21 | Lilzlj | ||
| US2439350A (en) * | 1943-10-09 | 1948-04-06 | F S Payne Co | Automatic adjustment for elevator brakes |
| US2461919A (en) * | 1944-09-14 | 1949-02-15 | Molins Machine Co Ltd | Dynamic braking arrangement for direct current motors |
| US2614160A (en) * | 1951-07-28 | 1952-10-14 | Gen Electric | Indicating system |
-
1958
- 1958-03-10 US US720154A patent/US3110019A/en not_active Expired - Lifetime
-
1959
- 1959-03-09 GB GB8022/59A patent/GB873809A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3110019A (en) | 1963-11-05 |
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