Using multiple DeltaV bulk power supplies for redundancy and load sharing in safety applications

The DeltaV Bulk Power Supplies can be used in safety applications that require load sharing and redundancy. Redundancy in safety applications can be achieved by using an n+ power scheme where n+ refers to using one more power supply than is required for continual steady state operation. N+ redundancy schemes are typically used for high integrity field power applications as shown in the following image. Emerson recommends the use of a surge suppression/filter device in safety applications as shown in the following images.

Figure: Redundant bulk power with redundancy modules in safety applications

Another type of redundancy for safety applications requires powering one system power supply from one bulk power supply and the redundant system power supply from another bulk power supply as shown in the following image. A surge suppression/filter device is also recommended in this redundancy scheme.

Figure: Redundant bulk power supplies feeding primary and secondary system power supplies in safety applications

The highest integrity power scheme for safety applications combines two bulk power supplies through a redundancy module to power one system power supply and a second pair of redundant bulk power supplies with a redundancy module to power a redundant system power supply. A surge suppression/filter device is also recommended in this redundancy scheme as shown in the following image.

Figure: Redundant bulk power supplies with redundancy modules feeding primary and secondary system power supplies in safety applications with increased power requirements