NIFTYLIFT Nifty Heightrider HR12 Series Operating/Safety Instructions Manual page 56

Height Rider/SP Series
Operating & Safety Instructions
A7 INTERLOCKING OF TRAVEL CONTROLS
The interlocking of the control positions is PL b in accordance with ISO 13849-1:2008 as required by
BS EN 280:2013
1. The limits of the safety-related parts to the category selected and any fault exclusions;
The cage control block has internal circuitry which isolates all boom control commands if either the
primary drive or steer segments are being used. The internal flow path is denied from the secondary
functions when the first two segment levers are off their central flow path position. The base control
position has no drive nor steer segments so the boom controls do not need this interlock function.
Proper maintenance and daily safety checks to be observed.
By virtue of the physical separation of the flow paths, the drive and steer functions will always have
priority over any boom function. Consequently the boom controls can be interrupted at any time by
inadvertent operation of either drive or steer. Reasonably foreseeable misuse.
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, who are
conversant with all modes of operation, speeds and characteristics of this model.
3. The effects of deviations from the specified performance on the safety function(s);
If the interlocking of the travel controls does not function as intended it is possible that the Niftylift may
allow modes of operation that render it potentially dangerous.
If the controls do not remain independent in their operation, 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 internal flow path that supplies pressure to the subsidiary functions for all boom controls is
interrupted by the use of tether the drive or steer segment. No flow is then available for any boom
movement as long as either of the two previous segments are away from their central rest position.
5. Response time
Loss of the boom functions is immediate as soon as a drive or steer function is selected.
6. Operating limits (including environmental conditions);
All components within the travel control interlock system are rated to the environmental conditions
acceptable for the machine; see Section 2.2
7. Indications and alarms;
None.
8. Muting and suspension of safety functions;
None.
54 English – 06/17
Original Instructions