GEM GLS Series - Emergency Evacuation; Emergency Evacuation by Release of the Brakes; Releasing of the Brake with the Lever for Hand Release; Releasing the Brake with Electric Emergency Power Supply (UPS)

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6.5 Emergency evacuation
Attention!
The measures for emergency evacuation described below may only be performed by
instructed
persons for maintenance of the elevator or qualified personnel of elevator
companies.
6.5.1 Emergency evacuation by release of the brakes
In case of power failure or failure of the recovery control, emergency rescue is only possible by
releasing the brakes. The brake can be released by an electrical emergency power supply or, if
available, by a manual hand release.
When the brakes are released manually, the elevator moves in the direction of the greater
weight. If
there is a balance between the cabin and the counterweight, the cabin must be made
heavier by
suitable means.
To reduce the acceleration of the elevator, we recommend short-circuiting the motor windings
for the
evacuation. The short-circuit is generated by the motor contactors or an electronic
circuit. This is always effective even in the event of a power failure.
The short-circuit generates a speed-dependent braking torque. The maximum braking torque is
achieved at lower speeds.
Depending on the system type and weight ratios, it is possible that due to the short-
circuit
generated braking torque is not sufficient to limit the lift speed. So the speed must
be
monitored closely during evacuation and evacuation interrupted if necessary.
Releasing of the brake can be ended when a floor is reached. Now the elevator door can be
opened
with a triangular key.
The elevator manufacturer's safety instructions have priority!
6.5.2 Releasing of the brake with the lever for hand release
Mechanical brake hand release system is available optionally. The hand release system
can be fitted later. Two different type of brake hand levers can be installed: levers for
Bowden cable (short) and levers for direct hand maneuvre (long).
Levers for Bowden cable Levers for direct hand maneuvre
For instructions about installation of those levers see “Installation Manual for EVO brakes”
Danger!
The hand release of the brake must be performed by trained personnel only and always with the cabin
position in sight.
6.5.3 Releasing the brake with electric emergency power supply (UPS)
By means of an uninterruptible power supply (UPS) the brake can be opened electrically. For this
purpose, for example, the existing dual circuit testing buttons can be used.
See “Brake control principle circuit diagram” in the Brake - Brake control chapter.
6.5.4 Automatic emergency evacuation
The automatic emergency evacuation lift power system (ELPS) is described in the operation
instructions of the system itself.