Section 7: Troubleshooting; Troubleshooting - Emerson Bettis EHO Installation, Operation And Maintenance Manual

Section 7: Troubleshooting

December 2022
Section 7: 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 8.
Symptoms
EHO does not turn on
EHO is on, but motor does
not run
EHO motor runs, but fails to
develop sufficient pressure to
open the valve
EHO will not return to the
Fail-Safe Position
Should any issue be experienced besides the symptoms noted above,
please consult factory.
Important check points for automatic operation of the EHO:
1.
2.
3.
4.
36

Troubleshooting

Possible Reason
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.
1. Ensure the Local/Off/Auto switch is in the proper position.
2. Ensure the field power wiring is an adequate size.
3. Power supply is insufficient.
4. Check to see if thermal overload is tripped.
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.
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.
Ensure oil level is at the proper level.
Ensure bypass valve (19) is closed.
Ensure handpump isolation valve (8) is open.
Check to see that the ESD (optional) signal power is on.
Installation, Operation and Maintenance Manual
VA001-507-32 Rev. 1
Troubleshooting