9
4.7 eLeCtriCaL COnneCtiOns
Before powering the actuator, check that the
supply voltage details on the nameplate are
correct for the plant. access to terminals for
electrical connections is through the terminal
cover.
Warning
After electrical on-field installation, please make
sure all removal of the cover assembly is done in
total observance of the applicable safety rules.
All the accessories (cable glands in particular)
must be certified according to the requirements
of the installation area and the relevant applicable
regulations.
Setting must be done while the actuator is
powered on. As a consequence, all setting
operations must be carried out by specifically
qualified personnel for operations on powered
electronic cards.
Biffi
f02 quarter-turn electric actuator
InstallatIon and MaIntenance InstructIons
4.8 pLant requireMents
Protection devices (over-current breakers,
magneto-thermal switches or fuses) must be
provided by the customer to protect the main
lines in case of motor over-current or loss of
insulation between phases and earth.
iMpOrtant
The following circuit breakers were identified on
the basis of the actuator technical features:
- reference: iec en 60947-2
- characteristic: K
It is the plant engineer’s or installer’s
responsibility to select the most appropriate
electric protection.
figure 7 -
setting of the mechanical stop.
screw 1
screw 2
4.6 setting Of the anguLar strOke:
MeChaniCaL stOps
it is important for the mechanical stops to
end the angular stroke at both extreme valve
positions (fully open and fully closed).
the setting of the angular stroke is performed
by adjusting the travel stop screw mounted on
the actuator housing.
for the adjustment of the stop screw proceed
as follows:
• loosen the lock nut
• screw 1: open
to set the mechanical stop in opening,
manually bring the actuator to the completely
open position, then turn screw 1 clockwise
to find the correct position, then block it by
means of the nut
• screw 2: close
to set the mechanical stop in closing,
manually bring the actuator to the completely
close position, then tighten screw 2
if the actuator angular stroke is stopped before
reaching the end position (fully open or closed),
proceed as follows:
• unscrew the stop screw by turning it
anticlockwise until the valve reaches the
correct position
• When unscrewing the stop screw, keep the
lock nut still with a wrench so that the sealing
washer does not withdraw together with the
screw
• tighten the lock nut
if the actuator angular stroke is stopped beyond
the end position (fully open or closed), proceed
as follows:
• screw the stop screw by turning it clockwise
until the valve reaches the correct position
• tighten the lock nut
