© 2014 General Electric Company. All Rights Reserved.
Indicates a trademark of General Electric Company and/or its subsidiaries. All other trademarks are the property of their
The PACSystems Power Sync and Measurement (PSM) system monitors two independent
three-phase power grids. It incorporates advanced digital signal processor (DSP) technology
to continuously process three voltage inputs and four current inputs for each grid.
Measurements include RMS voltages, RMS currents, RMS power, frequency, and phase
relationship between the phase voltages of both grids.
The PSM module performs calculations on each captured waveform, with the DSP
processing the data in less than two-thirds of a power line cycle. The PSM module can be
used with wye or delta type three-phase power systems or with single-phase power systems.
The PSM system can be used for applications such as:
Electrical power consumption monitoring and reporting
Generator control features for generator to power grid synchronization
Demand penalty cost reduction/load shedding
The PSM system consists of:
PSM module – A standard IC694 module that mounts in an RX3i rack. The PSM
module provides the DSP capability.
Terminal Assembly – A panel-mounted unit that provides the interface between the
PSM module and the input transformers.
Interface cables – Provide the GRID 1 and GRID 2 connections between the PSM
module and the Terminal Assembly.
PSM System Features
Uses standard, user-supplied current transformers (CTs) and potential transformers
(PTs) as its input devices.
Accurately measures RMS voltage and current, power, power factor, frequency,
energy, and total three-phase 15-minute power demand.
Provides two isolated relays that close when the voltage phase relationships between
the two monitored grids are within the specified ANSI 25 limits provided by the RX3i
host controller. These contacts can be used for general-purpose, lamp duty or pilot
duty loads. Voltage and current ratings for these load types are provided in GFK-2749,
PACSystems RX3i Power Sync and Measurement System User's Manual.
Provides a cable monitoring function that indicates when the cables linking the PSM
module and Terminal Assembly are correctly installed.
PSM module and Terminal Assembly are easily calibrated by hardware configuration
using the Proficy* Machine Edition (PME) software.
PSM System. Includes a PSM module, a Terminal Assembly and two interface cables
Replacement PSM module
Replacement Terminal Assembly
One replacement 2m (6.56 ft.) interface cable
PSM replacement parts:
two finger guards
four thumb screws
one relay connector
two grounding lug nuts
Power Sync and Measurement System
IC694PSM001-AB and IC694ACC200-A