7UMD-SRB02 Version 1
Operation
A sensor is fitted to an idler wheel or tension weight pulley or safety gear sensor
acting on a wire rope attached to the lift car. The sensor will detect movement in
either direction.
A controller box will be fitted nearby and connected to the sensor, main lift control
panel, over-speed governor & VG rope brakes or VG safety gear.
Once the system has been installed and set up, the rope brakes or safety gear
must be set.
The controller will receive an external signal to say that the lift doors are open,
which will activate the system to “Monitor for movement”.
If movement is detected above the predetermined limit of 100mm to 900mm,
(actual pre set limit is 150mm but can be modified to suit customer requirements)
the controller will actuate a safety relay causing all safety systems to be deployed.
Once deployed, the controller will deliberately not allow the lift to run or revert to a
normal state until the rope brakes or safety gear have been manually reset.
If no movement was detected and the controller receives a signal to say the doors
are closed it will deactivate and allow the normal operation of the lift and primary
safety circuit.
During its operation, the control box will also continue to monitor the integrity of
the connection to the sensor assembly. It will also monitor the status of the rope
brakes or safety gear.
It will perform a simple self-diagnostic test to ensure all sensors are working, if a
fault develops a fault signal will be sent to the main lift control panel to request it to
bring the lift to halt at the next floor and open the doors (Please note the controller
can only send the signal and not control stopping of the lift). When the lift doors
open the rope brakes or safety gear will be deployed.
If during the monitoring phase, the connection to the sensor is lost, the rope brakes
or safety gear will be deployed.
Due to the battery backup, if mains power fails with the doors open, the system
will continue to operate and safely monitor for movement. If mains power fails
when the doors are closed the system will automatically monitor for movement
but will allow greater movement before applying the brakes.
The system is directly connected to the lift over-speed governor. So if over speed is
signalled the rope brakes or safety gear will be deployed immediately.
Maintenance, other than checking the cleanliness of the idler pulley assembly, is not
required for the actual components of the system, but it is strongly recommended
that the operation is regularly checked and tested by competent persons (lift
engineers) to comply with the regulations.
Specification
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