Athena 1470-HE EVO, Перевод оригинальной инструкции

Страница: 73 / 196

PAGE
73
ATTENTION: After performing any manual operations on the A-B-C-N-O valves, their
factory settings must be restored or machine safety will be compromised, with the
risk of the platform potentially overturning.
3.5.3 Hydraulic failure safety devices
The hydraulic system of the lifting circuit, in the event that there is an
accidental fault in the hydraulic piping that feeds the lifting cylinders of the
work platform, features three one-way valves, normally closed (1), electrically
driven and connected directly to the cylinder, which prevents the uncontrolled
descent of the work platform from any height, thus avoiding dangerous
situations.
A manifold containing a one-way valve (1) is flanged on the upper cylinder.
A manifold containing two one-way valves (1) is flanged on the lower cylinder.
On both manifolds there is an overcentre valve set to 200 bar (2) and driven by
an external pipe.
Driving (3) these valves under pressure (¼ Gas hose) allows for the emergency
descent of the work platform.
In order to pressurise the drive, the machine features a manual pump to be used
in the event of an emergency or if the electronic control unit is not powered
(4).
(ref. Point 5.10.2 UNI EN280:2015):