Page 28: of Marine Technology Magazine (November 2014)

Vessel Feature (UAF photo by Val Ihde) nates virtually all harmonic distortion by adding a phase shift environment. “If you lose one of the four generators when you to the drives’ transformers. This ensures that no dangerous are out to sea, it is not really a big problem,” Pomeroy said. harmonics will affect either the vessel or its sensitive research “The power management system ensures the load on each experiments. generator is less than 90 percent, but can go up to 110 percent

Siemens S7 400 controllers, HMI and four, 690V switch- for short periods of time. You cut back your loads to fall boards take the power from the generators and communicate within the power that is generated from the other generators. via hardwire and serial I/O. If you lose another one or two, you have to cut your power

Simatic touch panel HMI screens are located on the bridge, back in order to stay within the power being generated by the galley, captain’s stateroom, chief engineer stateroom, pow- plant because you don’t want your entire plant to go dead,” erhouse, and engineering control room. Step 7 software in- Pomeroy said. cludes a historian function to accommodate the redundant The Sikuliaq’s power management system monitors the controller con