1.1
Description and functions
The overspeed governor is a safety device that
comes into operation when the lift car exceeds its
permitted speed.
If the lift car exceeds its rated speed upon descent,
the overspeed governor release when its tripping
speed is reached and triggers the safety gear on
the lift car via the governor rope.
The lift car is brought to a standstill and clamps
onto the guide rails.
The basic functions of the governor are to detect
overspeed mechanical and electrically:
•
to activate the safety gear mechanical
•
to stop the elevator drive electrically
A tension weight is needed to tighten the rope of
the overspeed governor.
Nominal speed
max. 600ft/min (3,05m/s)
Travel height
max. 500ft (152,4m)
Rope diameter
d = 6 / 6,5mm
Setting 1 Setting 2
Brake force of
min.
500N
800N
the governor
max. 1000N 1300N
Tension weight
min.
250N
600N
max.
800N
800N
Travel downwards:
Because of the centrifugal force, two rotating
spring loaded flyweights (1) are forced outwards.
Thereby, the two eccentric wheels (3) connected
with the flyweights move towards the trip wheel
(6) in the centre.
If the nominal elevator speed is exceeded, the fly-
weight (1) will hit the contact plate (7), activating
the overspeed contact (5) to switch off the safety
circuit.
If the speed still increases, the eccentric wheels
will grip into the non-rotating trip wheel (6),
which will block the governor wheel and activate
the safety gear.
The trip wheel has a friction coupler, which limit
the force in the rope to max. 1000 / 1300N. If the
force in the rope exceeds the brake force, the trip
wheel starts to rotate together with the governor
wheel. This to protect rope and the safety gear sys-
tem from damage.
Travel upwards:
In upwards direction the safety circuit is switched
off in the same way as for downwards direction.
The safety gear will not be activated in upward
direction!
1. Flyweight
5. Overspeed contact
2. Spring
6. Trip wheel
3. Eccentric wheel
7. Contact plate
8. Governor wheel
Änderungen vorbehalten!
Subject to change without notice!
Overspeed Governor
OL35E-NA
Operating instructions
Blatt/
sheet PM.7.002374.002
Datum/
date
08.04.2011
Stand/
version C-20.09.2017
Geprüft/
approved WAT/MZE
1
General information prior to installation
