IS400WNPSH1A - WNPS +28 to -28 V Power Supply | GE Mark VIeS | B7B

IS400WNPSH1A is a General Electric WNPS +28 to -28 V Power Supply daughterboard for GE SPEEDTRONIC™ Mark VIeS Safety control systems. The WNPS function supports negative sensor power conversion operation in turbine control and balance-of-plant applications that use the Mark VIeS Terminal Board and I/O Hardware. It should be matched to the installed catalog number, hardware form, and cabinet configuration before it is used as a replacement.

GE documentation identifies WNPS as a removable daughterboard used with the TVBAH#A and TVBAS#A vibration terminal boards (not required on TVBAH#B or TVBAS2B, where this function is integrated into the terminal board) that converts sourced +28 V dc power to -28 V dc power for Bently Nevada* vibration sensors. Up to three WNPS boards are used per terminal board to provide redundant N24 power from the R, S, and T 28 V buses, with a documented nominal output of -28 V dc (-26.6 to -29.4 V dc), output voltage ripple of 280 mV pk, and maximum output current of 400 mA. It should be matched with the compatible TVBA vibration terminal board where that pairing is used in the site configuration.

This component is typically considered when troubleshooting Mark VIeS Safety hardware, replacing a failed module, evaluating repair options, or maintaining spare inventory for turbine control systems. Before installation, verify the catalog number, hardware revision, and associated terminal board or I/O pack configuration against site documentation and OEM requirements. The OEM reference for this listing is GEH-6721 Vol I; GEH-6721 Vol II.

Control system parts are provided by GTC Control Solutions, Inc., a wholly owned subsidiary of B7B. Parts are offered in unused, repaired, or remanufactured condition, subject to availability. Each repaired or remanufactured component undergoes comprehensive functional testing in energized panels to guarantee reliability and performance. We provide detailed test reports and warranties with every repair, giving you confidence in the quality and longevity of your replacement parts.