February 2022
Installation, Operation and Maintenance Manual
VCIOM-15345-EN Rev. 1
70
Troubleshooting
Section 9: Troubleshooting
Section 9: Troubleshooting
!
WARNING
To prevent personal injury, the actuator must be in spring-return, Fail-Safe Position and all
hydraulic pressure drained, including an optional accumulator, before opening any tube
lines or attempting replacement operations below.
Of all the system components, the actuator itself is least likely to malfunction and require
the most time and effort to service.
Table 31.
Troubleshooting
Symptoms
Possible Reason
Biffi EHO does not turn on.
1. Ensure voltage is adequate to the unit.
2. Check to see that the electrical power is connected to the
correct terminals.
3. Branch circuit fuse blown out.
Biffi EHO is on, but alarm is flashing on
the LCD display.
1. Consult Section 8.5 for alarm details.
2. If operator is unsure how to clear the alarm, please contact
factory for assistance.
Biffi EHO is on, but motor does not run.
1. Ensure the Local/Off/Auto switch is in the proper position.
2. Ensure the customer field power wiring is an adequate size.
3. Power supply is insufficient.
4. Check to see if thermal overload is tripped.
5. Check Signal Integrity when operated Remotely.
Biffi EHO motor runs, but fails to develop
sufficient pressure to open the valve.
1. Low fluid level in reservoir.
2. Wrong motor shaft rotation.
3. Manual bypass valve (19) is open.
4. Handpump isolation valve (8) is closed
(if optional accumulator is provided).
5. ESD solenoid is not energized because signal power
is insufficient.
6. The Relief valve is cracking open.
Check to ensure setting set to factory setting.
Biffi EHO will not return to the
Fail-Safe Position.
1. Ensure the Local/Off/Auto switch is in the proper position
when initiating the open/close command.
2. Handpump isolation valve (8) is closed; preventing ability to
stroke to the Fail-Safe Position.
3. Ensure the closing and ESD speed control valves are open.
Should any issue be experienced besides the symptoms noted above, please consult factory.
Important check points for automatic operation of the Biffi EHO:
1.
Ensure oil level is at the proper level.
2.
Ensure bypass valve (19) is closed.
3.
Ensure handpump isolation valve (8) is open.
4.
Check to see that the ESD (optional) signal power is on.
