Installation
4.2.2
Position After Failure
The position of the actuator after a failure depends on the:
1.
Principle of operation (see paragraph 4.3)
2.
Assembly codes (see paragraph 4.4)
3.
Kind of failure. Refer to the table below.
Table 5.
Position After Failure
Principle of
Operation
Assembly Code
Kind of Failure
Position
Double-Acting
Actuator
Pressure
Not defined
Signal
Closed
Supply Voltage
Closed
Pressure
Not defined
Signal
Open
Supply Voltage
Open
Single-Acting
(Spring-Return)
Actuator
Pressure
Closed
Signal
Closed
Supply Voltage
Closed
Pressure
Open
Signal
Open
Supply Voltage
Open
Table 6.
Position after a failure with a Double-Acting module with
Fail-In-Last-Position Function
Principle of
Operation
Assembly Code
Kind of Failure
Position
Double-Acting
Actuator
Pressure
Not defined
Signal
Not defined
Supply Voltage
Closed
Pressure
Not defined
Signal
Not defined
Supply Voltage
Open
CW
CW
CW
10
April 2019
Installation, Operation and Maintenance Manual
DOC.IOM.BQ.E Rev. 3
Section 4: Installation