Blatt/
sheet
D729MGB.021
Datum/
date
23.05.2007
Stand/
version C-07.09.2011
Geprüft/
approved WAT/MZE
Änderungen vorbehalten!
Subject to change without notice!
Progressive Safety Gear
USG-25P
Operating Instructions
•
Secure the car safety gear by tying the safety
gear lever up. This prevents unintended grip-
ping of the car safety gear due to jumping of
the car.
Gearless elevator:
•
Switch the main power OFF. Open the ma-
chine brake manually and let the counter-
weight accelerate to the tripping speed of the
overspeed governor. The overspeed governor
should trip, which will engage the safety gear
and stop the counterweight.
Do not let the counterweight run onto the
buffer.
Geared elevator:
•
Accelerate the counterweight with the hoist-
ing motor to the rated speed, keep the ma-
chine brake open manually, switch the main
power OFF and let the counterweight acceler-
ate to the tripping speed of the overspeed
governor. The overspeed governor should trip,
safety gear engage and counterweight stop.
Do not let the counterweight run onto the
buffer.
•
Try to drive the counterweight down to check
that the safety gear has engaged (suspension
ropes should slide on the traction sheave).
4.3.3
Checking safety gear, car and counter-
weight and returning the elevator to
normal drive
•
Release the safety gear by driving the car or
counterweight up.
Force to lift the elevator after gripping:
F = 1,5 x F
max
•
Remove test weights (if applicable).
•
Reset the overspeed governor (if needed).
•
Remove temporary securing of the safety
gear (if applicable).
•
Check from the gripping marks if left and
right safety gear was gripping at the same
time
•
Measure the roller gripping marke.
4.3.4
Visual checks after a safety gear test
•
Check that the inclination of the car, car sling
or counterweight frame, in any direction, is
not more than 5% (for example car floor is
not horizontal or car entrance is not parallel
with landing door entrance). A visual check is
sufficient.
•
Safety gear:
Drive the car to the lowest floor and check
from the pit following items:
- existence of roller
- existence of brake lining
- visual defects of safety gear parts
- defects on the Synchronisation resp.
governor linkage
- defects on the safety gear housing
•
Check that the actuating mechanism and the
safety gear contact have returned to their ini-
tial positions
If there is any defect the safety gear must
be replaced!
After the safety gear test the burrs must
be removed from the guide rails.
If deviations from the permitted limits had
been noticed during safety gear test
please contact us at WITTUR.
