nifty TrackDrive TD120T Series Operating/Safety Instructions Manual page 49

A3 PLATFORM LEVELLING
The Platform levelling system is PL c in accordance with ISO 13849-1:2008 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 Platform levelling system comprises of a load holding device mounted to the slave levelling
cylinder.
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.
In the event of a hose failure ensure a recovery plan is in place that does not require the movement of
the luffing booms as the angle of the cage will not be maintained. See effect of deviations from the
specified performance below.
Maintenance must only be carried out by appropriately trained and competent persons.
3. The effects of deviations from the specified performance on the safety function(s);
If the levelling system of the product does not function as intended the angle of the cage may not be
maintained.
If the angle of cage is not maintained there is an increased risk of ejection of tools and equipment from
the cage.
In the event of the operator or other occupants of the cage not using the required safety equipment they
may be ejected from the cage and serious injury or death may occur.
There is a load holding device contained within the assembly of the slave levelling cylinder such that if
a hose fails the cage position is maintained until the operator can be recovered from the cage.
4. Clear descriptions of the interfaces to the SRP/CS and protective devices;
The levelling system comprises of two hydraulic cylinders and interconnecting hoses.
One is referred to as the Master levelling cylinder
The other is referred to as the Slave levelling cylinder.
In normal operation when the luffing booms are elevated the master levelling cylinder responds to the
movement of the booms and causes a transfer of hydraulic fluid to the appropriate side of the slave
levelling cylinder.
This transfer of hydraulic fluid maintains the level aspect of the cage.
5. Response time
The Levelling system is a direct acting hydraulic system and as such the response time is near
instantaneous.
English/USA – 02/17
TrackDrive (TD) Series
Operating & Safety Instructions
47