Safety monitoring device with instantaneous speed determination for a lift car
First Claim
1. A safety monitoring device for a lift car which is moveable in a lift shaft by means of a traction drive via a lift control system andwhose instantaneous position is registratable by means of a position registering device which supplies two position signals, produced independently of each other, in a predetermined time pattern, having two-channel evaluation of the position signals by means of a microprocessor in each case for location-dependent, instantaneous determination of the speed of the lift car obtained from the two-channel evaluation of the position signals and for comparison with a predefined movement profile, wherein the two microprocessors communicate with each other via a line for mutual monitoring, in the case a predetermined instantaneous speed desired value is exceeded it being provided to generate a trigger signal outputed via a safety relay stage.
1 Assignment
0 Petitions
Accused Products
Abstract
A safety monitoring device is provided for a lift car which can be moved in a lift shaft by a traction drive via a lift control system and whose instantaneous position can be registered by a position registering device which supplies two position signals, produced independently of each other, in a predetermined time pattern, having two-channel evaluation of the position signals by means of a microprocessor in each case for location-dependent, instantaneous determination of the speed of the lift car and for comparison with a predefined movement profile, it being possible for a trigger signal that can be output via a safety relay stage to be generated if a predetermined instantaneous speed desired value is exceeded.
-
Citations
8 Claims
-
1. A safety monitoring device for a lift car which is moveable in a lift shaft by means of a traction drive via a lift control system and
whose instantaneous position is registratable by means of a position registering device which supplies two position signals, produced independently of each other, in a predetermined time pattern, having two-channel evaluation of the position signals by means of a microprocessor in each case for location-dependent, instantaneous determination of the speed of the lift car obtained from the two-channel evaluation of the position signals and for comparison with a predefined movement profile, wherein the two microprocessors communicate with each other via a line for mutual monitoring, in the case a predetermined instantaneous speed desired value is exceeded it being provided to generate a trigger signal outputed via a safety relay stage.
Specification