• Fail-to-close: The actuator moves to the valve closed position.
A lead acid battery is selected for the UPS due to robust and well-proven
technology.
The failsafe module introduces changes to the overall actuator appearance and
function. The following limitations are important to consider during the design
phase.
• Location class for temperature is reduced from class D to class A when the
option failsafe is selected.
• Space needs increased, see Appendix B.4.v Space requirements on page 69.
• The battery needs a maintenance plan to maintain operationally ready, and to
be certain that the battery health’s is reported correctly. This is a requirement
from DNV GL and is needed to give alarms on battery change time.
• Storage conditions and charging of batteries in storage. A power plan must
be established concerning the installation of the failsafe actuator.
Figure 41: Actuator with Failsafe option
The bottom views for the motor and gear housing and the communication
interface box are identical to the standard version shown in Figure 5 and Figure 6
on pages 21and 21.
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