Height Rider/SP Series
Operating & Safety Instructions
English/USA – 01/18
Original instructions
56
A2
LIMITATION OF TRAVELLING SPEED
The limitation of travelling speed interlock, also known as the elevated drive speed system, is PL c in
accordance with BS EN ISO 13849-1:2015 as required by BS EN 280:2013+A1:2015.
1.
The limits of the safety-related parts to the category selected and any fault exclusions;
The elevated drive speed system is only active when the machine is not in the stowed position.
Two inclination sensors measure the angle of the booms, one on boom 2 and one on boom 3. The
base PLC calculates the difference in angle between the two booms to determine if the machine is
stowed or not.
Depending on the boom positions the PLC controls if elevated drive speed is selected.
Proper maintenance and daily safety checks to be observed.
The inclination sensor cannot be overridden to bypass the elevated drive system other than by
demounting the switches with the use of tools.
If the inclination sensors are removed or are not maintained in accordance with the appropriated
documentation the elevated drive speed system may not function in compliance with the requirements
as a PL c device.
2.
The limits of the SRP/CS and any fault exclusion, for which, when essential for maintaining the
selected category or categories and safety performance, appropriate information (e.g. for
modification, maintenance and repair) shall be given to ensure the continued justification of the
fault exclusion(s);
Do not alter, modify or disable in any way the controls, safety devices, interlocks or any other part of
the machine.
Maintenance must only be carried on by appropriately trained and competent persons.
3.
The effects of deviations from the specified performance on the safety function(s);
If the elevated drive speed interlock does not function as intended it is possible that the Niftylift may
experience dramatic dynamic effects which may adversely affect the stability of the product.
If the product becomes unstable, damage to the Niftylift, other equipment and properties, injury or loss
of life of the operator and surrounding persons may be a risk.
4.
Clear descriptions of the interfaces to the SRP/CS and protective devices;
The elevated drive speed interlock consists of the inclination sensors a PLC and solenoid operated
hydraulic valve.
If the drive forward or backwards functions are selected when the booms are stowed the PLC will allow
full speed drive functions. If the drive forward or backwards functions are selected when not stowed
the output from the PLC is required to energise the elevated drive valve to reduce the drive speed via
the motor controllers.
5.
Response time
The inclination sensor is active at all times providing the correct signal in relation to the position of the
booms. With the booms in the raised position the system will prevent high speed drive functions from
being performed until the booms have been lowered.
Содержание HR 12
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