BIFFI EFS2000v4 - Page 61

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BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
17.5 Trouble-shooting
If the actuator does not work before trouble-
shooting make sure that:
• The numeric display indicates xx.x %
• The LED of EFS card in the clutch
compartment is green
• The manual override selector is in AUTO
• The local selector is not in OFF
• The main supply voltage is the same as stated
in the name plate menu
• The supply of the EFS clutch is in the range
24 Vdc -240 Vac
• Move the local selector to OFF and check that
the upper line of the alphanumeric display
shows one of the following messages:
- ‘normal off’
- ‘alarm off’
- ‘warning off’
- ‘INT EFS off’
- ‘INT off’
If the above checks are okay, try to locate the
fault using the diagnostic facilities.
17.5.1 The LED of EFS card is always OFF
Check the voltage supply of the EFS clutch. It
should be in the range 24 Vdc - 240 Vac.
17.5.2 The electronics of electric actuator do not
switch on when powered
- Check that the value of the main voltage on
terminals L1, L2, L3 is correct.
- Remove the cover of the compartment where
the electronic cards are located.
- Check the fuse mounted on the power card.
Replace it if burned.
- If the fuse is okay, check the wires between
terminals L1, L2, L3 and connector M1 of the
power card. If it is correct, replace the power
card.
17.5.3 DC output voltage not available at the
terminals
- Switch the main power supply off and
disconnect all wires from terminals B1-B2
and C1.
- Switch the main power supply on and check if
the voltage on the terminals B1-B2 and C1 is
between 23 and 27 Vdc.
- If the voltage is correct check the external
wiring and the electrical load. It should not
exceed4W.
- If the voltage is not correct replace the
powercard.
Power card
Fuse
17.5.4 The actuator does not work from remote
controls
- Check that manual override selector is in
AUTO and the LED in the clutch compartment
is green.
- If the alphanumeric display indicates ‘INT’,
an interlock control is present. Move the
3-position selector to LOCAL and check that
the actuator works from local controls.
- Move the local selector to REMOTE. Check
the signal on terminals B3, B4 and B5.
- Check that:
• The wiring to terminals B1-B2 and C1 is
correct
• There is no short-circuit between wires
• The electrical load does not exceed 4W
• The value is in the range 20-120 Vac
50/60Hz or 20-125 Vdc, if external voltage
supply is used
17.5.5 The motor is very hot and does not start
- Check that no alarm other than motor
overheating is present.
- Wait until the motor cools down and the
normally closed contact of the thermal switch
automatically resets before trying to operate
the actuator again.
- Check that the number of operations per hour
and their duration is suitable for the actuator
service (see the nameplate menu).
- Check that the valve operating torque is
within the range of the unit’s designed
operating torque.
- Always check the causes of abnormal
operation.
17.5.6 The valve does not seat correctly
- If the valve is stopped by the torque limit in
closing, increase the actuator output torque
limit.
- If the valve is stopped by the position limit in
closing, check that the valve reaches its seat
position, and then readjust the setting of the
position limit.
- The internal trim of the valve may be
damaged.