BIFFI EFS2000v4 - Page 39

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BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
13.1.13.3 Torque limits
Torque limits are used as a reference for
torque alarm and end of travel. With option
‘standard’, the torque limits are constant along
the full stroke. The limits can be configured in
the ‘stroke limits’ or ‘torque set-up’ routines
and determine the torque alarm or end of
travel situations. In some special applications
it is useful to configure 3 different torque
thresholds for each traveling direction, so as
to separately limit the unseating, running and
ending torque values. To select this option, pick
‘3-point limits’ and follow the torque set-up and
stroke limits routine (see figure below).
Configuration procedure
• Move the local selector to OFF and then
simultaneously press OPEN and STOP within
20 sec (see chapter ‘Local controls, entering
the set-up mode). Select the language and
then enter the password according to the
instructions (see ‘Entering the set-up mode’).
When the message of the display is ‘SET-UP
MODE OK?’ press YES. Press YES to select
the actuator set-up menu, press NO to scroll
through the list of available routines and then
press YES to select Miscellaneous.
• Press NO, and then NO to select ‘torque
mode’. Press YES if the setting is correct,
press NO to change it. Press YES when the
value is correct.
• Repeat the ‘stroke limits set-up’ routine.
Actuator direction: closing Actuator direction: opening
13.1.13.4 Lithium battery
On request, the actuator can be provided with
a lithium battery to update the remote outputs
(output relays status and bus messages) in
case of electrical power failure and manual
override operations. The program runs the
functions relevant to the battery only if the
appropriate flag ‘lithium battery’ is configured
with ‘present’. If the battery is absent or if no
updating of remote outputs is requested, the
above flag should be configured with ‘absent’.
Configuration procedure
• Move the local selector to OFF and
then simultaneously press OPEN and
STOP within 20 sec (see chapter ‘Local
controls, enteringthe set-up mode’).
Closing torque % of nominal
Breakout limit
Ending limit
Position %
Running limit
100% Cl brk% Cl end % 0 %
Opening torque % of nominal
Breakout limit
Ending limit
Position %
Running limit
100% Cl brk% Cl end % 0 %
Select the language and enter the password
according to the instructions (see ‘Entering
the set-up mode’). When the message
displayed is ‘SET-UP MODE OK?’ press YES.
Press YES to select actuator set-up menu,
press NO to scroll through the list of available
routines and then press YES to select
Miscellaneous.
• Press No to scroll the list of routines and
press YES to select lithium battery. Press YES
if the setting is correct, press NO to change.
Press YES when the value is correct.
13.1.13.4.1 Torque by-pass (%)
Since a high torque may be required to unseat
certain valves, the torque by-pass routine
masks the torque alarm when an open or
close command is received and the actuator
is fully open or closed. The torque by-pass is
expressed in % of position and is configurable
from 0% to 20%. For example, if a 10% by-pass
value is set, we may have:
- by-pass active in Opening: from 0% to 10%
- by-pass active in Closing: from 100% to 90%
To exclude torque by-pass configure 0%.
Configuration procedure
• Move the local selector to OFF and then
simultaneously press OPEN and STOP within
20 sec (see chapter ‘Local controls, entering
the set-up mode’). Select the language
and enter the password according to the
instructions (see ‘Entering the set-up mode’).
When the message displayed is ‘SET-UP
MODE OK?’ press YES. Press YES to select
actuator set-up menu, press NO to scroll
through the list of available routines and then
press YES to select Miscellaneous.
• Press No to scroll through the list of routines
and press YES to select torque by pass. Press
YES if the setting is correct, press NO to
change. Press YES when the value is correct.