16
Event Possible cause Remedy
Actuator does not work 1. Lack of power supply 1. Restore it
2. Clogged filter 2. Clean or replace the cartridge
3. Blocked valve 3. Repair or replace
4. Failure of the spring 4. Call Biffi Customer Service
5. Failure of the control group 5. Call Biffi Customer Service
6. Low supply pressure 6. Restore (section 1.4)
Actuator too slow 1. Low supply pressure 1. Restore (section 1.4)
2. Wrong calibration of flow regulator valves 2. Restore (section 3.6)
3. Wear of the valve 3. Replace
Actuator too fast 1. High supply pressure 1. Restore (section 1.4)
2. Wrong calibration of flow regulator valves 2. Restore (section 3.6)
Leakages on hydraulic circuits 1. Deterioration and/or damage to gaskets 1. Call Biffi Customer Service
Incorrect position of the valve 1. Wrong adjustment of mechanical stops 1. Restore (section 3.4)
2. Wrong warning of microswitches 2. Restore (section 3.5)
Irregular movement of actuator or lower torque value 1. Wrong adjustment or unscrewing of thrust bearing-screw 1. See figure 21 below
6 TROUBLESHOOTING
6.1 Failure or breakdown research
7 LAYOUTS
7.1 Spare parts order
For spare parts order to the relevant Biffi
office please make reference to Biffi order
confirmation concerning all the supply, and
serial number of the actuator (section 1.2) for
any specific spare part for a specific actuator
model.
Please send every spare-parts request to:
Biffi Italia S.r.l.
Servizio Assistenza Tecnica Clienti
E-mail: spareservice
@biffi.it
Please specify:
1. Actuator model
2. Biffi acknowledgement
3. Spare parts code
4. Quantity
5. Transport condition
6. Involved people
Restore the correct position of thrust bearing-screw
Please refer to figure 20 section 5.2.1:
Screw the thrust bearing screw (15), complete
with the sliding block (19), into the threaded
hole of the housing until it reaches the correct
original position.
Check that the sealing washer (18) and the
washer (27) are in contact with the housing
surface. Tighten the lock nut (26).
FIGURE 21
RPS SPRING RETURN PNEUMATIC ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
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