Presentation on theme: "Protection against unintended car movement EN 81-1/2:1998 + A3:2009."— Presentation transcript:
Protection against unintended car movement EN 81-1/2: A3:2009
Mr. Robert Kaspersma
Liftinstituut in general Established in Implies over 75 years of experience Head-office Amsterdam/Netherlands based with several regional offices elsewhere in the Netherlands Office in Istanbul/Turkey App. 170 employees of which 125 inspectors Close co-operation with leading universi- ties, a.o. Delft University of Technology
Liftinstituut in general First European institution to be appointed as Notified Body with regard to Lift Directive 95/16/EC In March 2009 Liftinstituut was appointed as AECO (Acreditated Elevator/Escalator Certification Organization) by ANSI! Active participation in meetings of Notified Bodies Involved in many normalization committees for codes and standards in Europe / North America / ISO
EN 81-1/2: A3:2009 Valid from Main items: 1. restriction of scope (0.15 m/s) 2. fixing systems of removable guards 3. protection against unintended movements 4. levelling and re-levelling accuracy CEN declares items 3 and 4 are not related to the new Machinery Directive. Therefore transition period of 24 months for items 3 and 4 (comply fully )
Restriction of scope The MD (2006/42/EC) includes some changes for LD (95/16/EC): Border between lifts and machines is more clear: Clause 1.3 g EN 81-1 (1.3 h EN 81-2) Lifts which have a speed of less than 0.15 m/s are excluded.
Fixing systems of removable guards The MD (2006/42/EC) includes some changes which have effect on lifts: Clause EN 81-1/2 The fixing system of guards, used specifically to provide protection against mechanical, electrical or any other hazards by means of a physical barrier, which have to be removed during regular maintenance and inspection, remains attached to the guard or to the equipment when the guard is removed.
Levelling and re-levelling accuracy Clause EN 81-1 (clause EN 81-2) The stopping accuracy of the car shall be ± 10 mm; A levelling accuracy of ± 20 mm shall be maintained. If, during e.g. loading and unloading phases, the value of 20 mm is exceeded, it shall be corrected.
Protection against unintended car movement Clause 9.11 EN 81-1 (clause 9.13 EN 81-2) Means shall stop unintended car movement away from the landing with the landing door not in the locked position and the car door not in the closed position.
Protection against unintended car movement Is a result of failure in any single component of the lift machine or drive control system upon which the safe movement of the car depends. Excluded are failure of the suspension ropes or chains and the traction sheave or drum or sprockets of the machine. (loss of traction)
Maximum stopping distances
System description DetectorMicroprocessor Stopping element
The unintended movement of the car shall be detected by at least one switching device at latest when the car leaves the unlocking zone (7.7.1). be a safety contact in conformity with be connected in such a way as to satisfy the requirements for safety circuits in (Fault tree) or (PESSRAL). Detectors
Stopping element The stopping element of the means shall act: on the car, or on the counterweight, or on the rope system (suspension or compensating), or on the traction sheave (e.g. on the sheave directly or on the same shaft in the immediate vicinity of the sheave).
Maximum retardation of the car with any load in the car, up to 100 % of rated load: 1 g n for unintended movements in up direction, the values accepted for safety gears in down direction. Stopping element
1 g n for unintended movements in up direction : the deceleration values should be verified or calculated taking into account an empty car and a fully loaded car. Stopping element
The values accepted for safety gears in down direction: This means that higher deceleration values than 1 g n are allowed. f.e. Instantaneous safety gears or progressive safety gears at a lower speed or loads Stopping element
Possible elements: Normal brake Traction sheave brake Rope gripper Overspeed governor Safety gear Safety valve Stopping element
Typical sequence 1. Car is not at the level and starts to re- level. 2. Car accelerates and passes allowed levelling zone. 3. Power is removed from motor/brake and UCM is activated. 4. UCM means is stopping the car.
The maximum speed is depending on: System setup (weights, sheaves, travel) Drive system (power, detection) Response time [detection(3), stopping element (4)]
Questions to ask 1. What is the levelling zone? 2. What is the delay of electrical system? 3. What speed can the drive accomplish? 4. What is the natural acceleration? CWT mass, Car mass, Nominal load Rule of thumb: Empty: g n = g x (( CWT m – Car m ) / (CWT m + Car m )) Full: g n = g x (( CWT m – Car m ) / (CWT m + Car m + Q))
Questions to ask 5. What is the delay of stopping element? 6. What is stopping force? 7. Is the final result within the limits
(EC)Type examination Type examination for A3 component A3 certification can be part of EC type examination component, only one certificate and report required.
Examples Overspeed governor Delay in electrical activation (ms) Delay in activating stopping element (cm) Reliability of acting components (tests)
Examples Safety gear Delay in mechanical activation (cm) Minimum activation speed (0 m/s) Maximum activation speed Durability 20 tests with maximum activating speed Braking force (car must stop also upwards)
Examples Rope gripper Delay in electrical activation (ms) Minimum activation speed (0 m/s) Maximum activation speed Durability 20 tests with maximum activating speed Braking force (car must stop also upwards)
Examples Machine Brake Not used for normal stopping Check on correct functioning Contacts (movement of brake claws) Torque check Delay in electrical activation (ms) Braking force / Traction!
Hydraulics EXAMPLE Second lowering valve on cylinder Independently opened Valves need to be checked on correct function(self-monitoring).
Certificate information Certificate for the complete UCM-Protection system type and application of the unintended car movement protection system; the limits of the key parameters (as agreed between laboratory and manufacturer); the test-speed with relevant parameters for Final Inspection use; the type of parts on which the stopping elements act; the combination of detecting device and stopping system of the means.
Certificate information Certificate for the detector as part of the UCM- Protection system type and application of the detector as part of the UCM- Protection system; the limits of the key parameters (as agreed between laboratory and manufacturer); depending on the working principle of the detecting device: the maximum applicable parameters before activating the braking system; e.g. limit values of distances / detection time / speeds / accelerations etc. delay time the combination of detecting device and the intended stopping system of the means.
Certificate information Certificate for the stopping system as part of the UCM-Protection system type and application of the stopping system as part of the UCM-Protection system; the limits of the key parameters (as agreed between laboratory and manufacturer); the test-speed with relevant parameters for Final Inspection use; depending on the working principle of the stopping system: the maximum applicable parameters of the stopping system; e.g. min. / max. breaking force / torque distances from begin of activation until reaching min. / max. breaking force / torque stopping distances (movement of the car with engaged stopping elements) in conjunction with wear and tear maximum permissible speed before deceleration occurs delay time the type of parts on which the stopping elements act; the combination of detecting device and stopping system of the means.
Complete systems: Mitsubishi, Schindler: –detection means and machine brake including application range Parts: Bode: –overspeed governors –rope gripper Cobianchi: safety gears Hollister & Whitney: rope gripper