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BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
17.5.11 Alarm table
Available controls
Display message Condition for alarm Action Local Remote Alarm reset
High torque in
closing
Measured torque greater than the
relevant value configured in torque
set-up or stroke limits routine
Operate the actuator in opening
direction. Check the torque needed
to operate the valve
Only open Only open Open, control
High torque in
opening
Measured torque greater than the
relevant value configured in torque set-
up or stroke limits routine
Operate the actuator in closing
direction. Check the torque needed
to operate the valve
Only close Only close Close, control
Jammed valve in
closing
No position change after receiving a
close control
Check status of actuator and valve
mechanical parts
Only open Only open Open, control
Jammed valve in
opening
No position change after receiving an
open control
Check status of actuator and valve
mechanical parts
Only close Only close Close, control
Motor thermostat Motor thermostat open for high
temperature in the motor windings
Wait until the motor cools down Not available Not available When thermostat closes
Internal
temperature
Temperature inside the actuator
enclosure higher than 90°C or lower
than -40°C
Ambient temperature too high or
too low. Verify insulation among
actuator and heat source
Not available Not available Control temperature
<90°C or >-40°C
Position sensor Value of the actuator position
not valid Replace position sensor or recalibrate
both stroke limits
Not available Not available Position signal
correct
Speed sensor Measure of motor speed not valid Replace speed sensor Not available Not available Speed signal correct
Mid travel alarm
in OP
The valve does not move in presence of
an open control
Check status of actuator and valve
mechanical parts. Recalibrate both
stroke limits
Only close Only close Close, control
Mid travel alarm
in CL
The valve does not move in presence of
a close control
Check status of actuator and valve
mechanical parts. Recalibrate both
stroke limits.
Only open Only open Open, control
Main voltage Main voltage lower than -20% or higher
than +20% of the value stated in the
nameplate menu
Check main voltage supply and
frequency on terminals L1, L2 and
L3. Check that wires section is
correct
Not available Not available Main voltage correct
K1 contactor The test routine reports a failure of K1
(coil or auxiliary contact)
Check the contactor Opposite
direction
Opposite direction Control in opposite
direction
K2 contactor The test routine reports a failure of K2
(coil or auxiliary contact)
Check the contactor Opposite
direction
Opposite direction Control in opposite
direction
Configuration
object nr.
The check sum of the EEPROM memory
that contains the configuration data is
wrong
Re-configure all parameters
(see next page)
Not available Not available Memory okay
Hardware nr. The diagnostic program detects
some malfunction in the electronics
controlling the actuator
Some circuit is damaged and does
not work (see details next page)
Not available Not available Hardware okay
Low lithium
battery
The voltage of the lithium battery is
too low (only detected if the battery is
present and the relevant parameter
of the miscellaneous routine is set to
‘present’)
Change lithium battery Available with
main voltage
Available with main
voltage
Lithium battery okay
Lost phase The alarm appears only with 3–phase
main supply. The alarm is generated in
case of fault of one of the phases that
supply the actuator transformer
Check main power supply on
terminals L1, L2 and L3
Not available Not available Phase okay
Request signal The analog 4-20 mA signal is not correct Check the external 4-20 mA
generator and wiring
Available Positioner function
not available
4-20 mA input okay
EFS mid travel The position is >4% in ESD action and
often 3*reset time
Check reset time. Check electrical
stroke limits. Check mechanical
stops
Not available Not available Electrical actuator
command after the clutch
has been re-energized or
by local operator interface
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