Passenger and freight lifts requiring EN 81-20/EN 81-50 safety compliance
Challenge
Friction-drive encoder on traction sheave slipped under load changes, causing ±30 mm floor mis-levelling and lift-out-of-service calls.
Solution
Kubler KIH40 hollow-shaft incremental encoder clamped directly onto traction machine shaft; no friction coupling required.
Floor levelling accuracy improved to ±5 mm; out-of-service calls reduced by 80% over a 12-lift modernisation project.
Challenge
Ageing electromechanical door edges on a 1990s lift bank no longer met EN 81-20 SIL 2 requirements, risking regulatory non-compliance.
Solution
Cedes Cegard/Mini optical safety edge with SIL 2 output fitted to all 8 car doors; existing wiring reused with adapter harness.
EN 81-20 compliance achieved; zero door-entrapment incidents in 18 months post-installation.
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