Gearless Lift Machine
WSG-TB
Operating Instructions
Subject to changes without notice ! Subject to changes without notice !
EN
6.5. Testing the brake system to EN 81
Overload
• The brake system should be tested by interrupting the power supply to the motor and brake system with the
car moving downward at rated speed and
1.25 times
the rated load. The brake system must be capable of
decelerating the car.
Failure of a brake
• If one brake fails, the brake system must still be capable of decelerating the car sufficiently during its down -
ward travel at rated load and rated speed.
• When simulating the failure of one brake, the other brakes must be kept open separately, even if the safety
circuit is open. This should be done using suitable electric circuitry or by hand.
• This state must not be maintained in the long term!
• Observe the lift during this test. If it does not decelerate, close the open brake circuit immediately.
Separate operation of the individual brakes
• The only method by which the partial brakes can be released separately is through electrical control. The
brakes can be activated/deactivated quickly using individual control buttons.
Monitoring the brakes
• Check the brake monitoring switches individually. No car travel must be permitted if a microswitch signal is
missing or a wrong signal operates.
The brake system should be tested with the car about halfway down the shaft. If any motor short-circuit
connections have been made, these should be deactivated so that the brake effect can be tested
independently.
Warning
When the evacuation is finished, the initial state has to be restored. Especially the lever
extensions have to be removed.
• Is the brake opened manually, the cabin moves in the direction of the higher weight. In case of balance, the
cabin has to be weighted down with suitable additional mass.
• The motor winding has to be short-circuited via the motor contactors. With the short circuit the motor cre -
ates a brake torque, which is dependent on the motor speed. This prevents an uncontrolled acceleration of the
elevator.
• It is possible that the brake torque which is created by the motor short circuit is not enough to limit the
speed of the elevator. Therefore the cabin speed has to be observed carefully during the evacuation and if
needed, the evacuation has to be stopped.
• When the cabin has reached the next floor, the manually opened brake is closed again. The rescue of the
trapped persons in the cabin can begin.
Electrically operated evacuation in case of emergency
• The electrical opening of the brakes is done using the power grid or an UPS.
• The operating instructions of the controller, the inverter or the evacuation unit with UPS have to be fol lowed!
Gearless Lift Machine
WSG-TB
Operating Instructions
Code
GM.8.004610.FR
Date
14.05.2018
Statut
0.01
Page
19
Subject to changes without notice ! Subject to changes without notice !
EN
Summary of Contents for WSG-TB.3 series
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