BIFFI EFS2000v4 - Page 58

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BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
Hand pump
Drain/charge plug
Needle valve (352)
High pressure manometer
WARNING!
For safety reasons it is required that at the end
of operation by hand pump, the lever is removed
from the hand pump yoke and the yoke is fixed
using the existing split pin.
If at the end of a manual operation, the actuator
is required to remain in the energized position,
it is necessary to leave the hydraulic selector in
MANUAL position.
To restore the electric mode function, the
hydraulic selector has to be moved to AUTO
position and, as soon the electrical power is
available, the red mushroom push-button has
to be pressed to RESET the actuator.
16.2.3 Accumulator recharge
The actuator is supplied with the accumulator
(30) charged at a 3bar pressure, with the
main spring in its released position (failsafe
condition).
If it is necessary to recharge the accumulator
during or after the field installation, or after
a maintenance intervention, the following
instructions have to be performed:
• Check if the actuator is really in failsafe
condition, with the main spring released;
press the REDmushroom push button to
ensure that the actuator is in the correct
position.
Purge
Plugs
¼” NPT hose
• Check that the needle valve (352) is
completely closed.
• Remove the drain/charge plug (P) by
unscrewing it.
• Connect a ¼” NPT hose to the drain/charge
hole, and fill the oil until the low pressure
manometer (621/BP) reaches a 3 bar
pressure.
• Open the needle valve (352).
• During the refill with oil, it is possible that air
is introduced inside the accumulator: this air
has to be leaked using the two leaking plugs
on the upper part of the manifold.
• Close the needle valve (352).
• Remove the ¼” NPT hose and close the drain/
charge hole with the drain/charge plug(P).