Tripping speed calculation

Rated speed Vn [m/s]
Minimum mechanical tripping speed Va_min [m/s] EN 81-20:2020-5.6.2.2.1.1
Min.: vn * 115%
 
Maximum mechanical tripping speed Va_max [m/s] Requirement Max. permissible speed acc. to standard [m/s]
Instantaneous safety gear
(EN 81-20: 5.6.2.2.1.1 a.1)		 < 0.80
Captive roller type safety gear
(EN 81-20: 5.6.2.2.1.1 a.2)		 < 1.00
Progressive safety gear up to 1.0 m/s
(EN 81-20: 5.6.2.2.1.1 a.3)		 < 1.50
Progressive safety gear beyond 1.0 m/s
(EN 81-20: 5.6.2.2.1.1 a.4)		 < (1.25 * vn)
+ (0.25 / vn)

BODE Recommendation

Click the icon to transfer values directly into the request/order form.
Va [m/s] Pre-cut off [m/s]
Instantaneous safety gear
(EN 81-20: 5.6.2.2.1.1 a.1)
Captive roller type safety gear
(EN 81-20: 5.6.2.2.1.1 a.2)
Progressive safety gear up to 1.0 m/s
(EN 81-20: 5.6.2.2.1.1 a.3)
Progressive safety gear beyond 1.0 m/s
(EN 81-20: 5.6.2.2.1.1 a.4)
Standard recommendation for selecting Va Vn ≤ 1 m/s: as close as possible to Va_min
Vn > 1 m/s: as close as possible to Va_max

This is only a tool, BODE provides to select the correct tripping speed. It is the customer’s sole responsibility to finally define the tripping speed.