BIFFI EFS2000v4 - Page 12

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BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
7.6.1 Command to initiate PST cycle
The PST cycle is initiated only if the actuator
is in the correct end of travel (fully open with
spring to close or fully close with spring to
open). In PST AUTO mode, the test is performed
at a configurable period of time and hour of the
day (according to the configured parameters)
if the actuator local selector is in LOCAL or
REMOTE.
In PST MANUAL mode, the test is performed
when a remote hardwired or bus command is
received and if the actuator local selector is
in REMOTE. The test can be also be executed
by a local command available in the VIEW and
SETUP menu, SETUP, MAINTENANCE routines,
PST command.
Select option “new baseline” to save the
collected data in the BASELINE curve, select
option “normal” to save the data as a normal
PST curve.
In PST MAN-AUTO, the test is performed
automatically and by a local or remote
command according to above description.
7.6.2 Reset of PST cycle
The PST cycle aborts on the following condition:
• Actuator local selector switched during PST
execution.
• EFS action during PST execution
• Switch of manual override selector to
MANUAL.
• Failure of solenoid valve used to perform
PSTcycle
• Alarm of electrical actuator.
• Position does not change in a predetermined
time during the spring action phase
7.6.3 PST report and warning
At the end of each PST cycle, the following
status and warnings are available:
• Passed: test OK.
• Reset: test aborted. The warning “PST” is
generated.
• T-PST: failed time T-PST, time needed to
change the position of the PST TRAVEL by
the spring action. The warning “T-PST” is
generated.
• T-RET: failed time T-RET, time to return to
position before test. The warning “T-PST” is
generated.
• OV-TR: PST over-travel, the position change
was greater than allowed. The warning
“OV-TR” is generated.
• Failed: at least two of the T-PST, T-RET,
OV-TR conditions failed. The warning “Failed”
is generated.
The data can be viewed by the local operator
interface or by a PC/PDA connected via
Bluetooth interface. Warnings are recorded
in the warning log registers (see maintenance
routines of VIEWand SETUP menu).
7.6.4 PST curves and PST baseline
During the PST cycle the time corresponding to
any 1% of valve position variation is memorized.
With the above data it is possible to view the
curve of the “valve position%“ versus “time”.
Up to 16 PST curves can be memorized. When
a new set of data is available the oldest one
is deleted and the new data is stored. The
command “SET PST REFERENCE” available
in the VIEW and SETUP menu allows one to
make a copy of 1 of the 16 “PST curves” to the
“PST BASELINE”. The “PST BASELINE” will not
be updated until a new “SET PST BASELINE”
command is entered.
The BASELINE curve can also be defined by
the PST command, available in the VIEW and
SETUP menu, SETUP, MAINTENANCE routines.
By selecting the option “BASELINE” the PST
command is executed and the collected data
are saved in the PST BASELINE.
The data can be read by a PDA or PC with
the A-manager software and PST curves
and BASELINE, position versus time, can be
visualized and compared.
7.7 Remote signaling
The parameter "ESD" (to be intended as "EFS
Shut-Down Reference") , in the VIEW and
SETUP menu, Actuator setup, Output Relays,
can be used to configure the monitor relay to
switch over if the following conditions occur:
• Clutch de-energized and AUTO/MANUAL
selector in AUTO. It means that the EFS
action is in progress
•AUTO/MANUAL selector in MANUAL. It means
that EFS is not available
The following conditions can be individually
configured to switch the auxiliary relays
As1,…,As8.
• PST active: PST cycle in progress
• EFS in MANUAL: manual override active
•EFS mid travel alarm: FAILSAFE position not
reached in the predetermined time
•PST failed: it summarizes the conditions
T-PST, T-RET, OV-TR, PST reset . The status
of relay can be reset by a manual reset
via actuator local operator interface or
alternatively by a new PST command.