38
DPT260
The bollard is in
high position and
a lowering com-
mand is given, but
the bollard
performs the
descent slowly
(only for products
equipped with
emergency
manual lowering).
(C010)
Even if it is
powered, the
bollard remains
for a long time in
high position, but
after a few days it
begins to lower
very slowly
(millimeter by
millimeter). (C009)
• The lowering solenoid valve is
not powered.
• The solenoid valve or the
solenoid valve coil is broken.
When an hydraulic system
remains in operation for a long
time, the internal pressure
decreases gradually up to not
being able to maintain the moving
cylinder in high position, because
of internal micro-leaks in the
system. The control unit analyzes
the pressure level in the system
and when it is lower than a certain
value it performs an automatic
adjustment. When it occurs, this
problem may be caused by:
• The automatic pressure adjust-
ment has been accidentally
excluded.
• The safety inductive detector
always in alarm (ON).
• Control (and if it is necessary replace) the solenoid
valve protection fuse in the master/slave units (master
unit PF4 - slave unit PF2).
• Replace the solenoid valve and/or the solenoid valve
coil.
• Verity that the dip switches 4 and 5 of the master board
are in OFF position.
• Reset the correct operation of the safety inductive
detector (sometimes the cause is the presence of a
metallic object on inductive loops).
UK
The bollard is in
high position and
a lowering com-
mand is given, the
bollard starts
lowering but it
stops in
intermediate
position. (C008)
• The piston rod is “dry” and must
be lubricated.
• The bollard was bumped
violently when in high position so
the piston rod is crooked.
• Lubricate the piston rod.
• Replace the piston.
