7.
Fail safe operation and standard operation
The fail safe operation is an emergency function. Depending on the fail safe
trigger via ESD or via power failure, an initialization operation is required. In
standard operation, the valve is electrically operated via the part-turn actuator.
Trigger signal for fail safe operation
A fail safe operation is triggered if the
ESD
(Emergency Shut Down) input is open
(0 V DC).
Switching behavior of
ESD
:
●
ESD
input = Low level (0 V DC or input open)
= fail safe operation is being executed
●
ESD
input = High level (+24 V DC)
= the valve can be operated in standard mode via actuator
Depending on the configuration, the fail safe operation can be initiated by power loss
at actuator controls. The factory configuration of the fail safe unit is configured at
assembly and is specified in the order-related technical data sheet.
Operating time configuration for fail safe operation
The operating time is preset in the factory. In order to modify the operating time, 4
different operating speeds (level 1 – level 4) can be selected via
FS speed
configuration
input (refer to wiring diagram).
We recommend contacting the AUMA Service prior to modifying the operating
time for a safe fail operation.
After fail safe operation
Turning handwheel at actuator following a fail safe operation!
Risk of hand injury for handwheels equipped with ball handle.
→
Do NOT press the push button at actuator handwheel.
→
Following a fail safe operation, manual operation may only be re-engaged after
successful initialization (
FQM FS ready
signal).
26
FQMEx 05.1 – FQMEx 12.1
Fail safe operation and standard operation
FM version (Class/Division System)
