PACSystems RX3i User manual

User Manual
GFK-2749A
Jan 2020
PACSystemsTM RX3i
POWER SYNC AND MEASUREMENT SYSTEM
USER MANUAL

User Manual Contents
GFK-2749A Jan 2020
Contents i
Contents
Chapter 1: PSM Module Description and Specifications...........1
1.1 PSM System Features........................................................................................... 1
1.2 PSM Module ........................................................................................................ 2
1.3 Terminal Assembly .............................................................................................. 3
1.4 Connectors.......................................................................................................... 3
1.5 User-Supplied Equipment .................................................................................... 4
1.6 PSM Part Numbers............................................................................................... 4
1.7 Specifications ...................................................................................................... 5
1.8 System Operation................................................................................................ 7
1.8.1 Autonomous Operation ............................................................................ 8
1.8.2 Frequency Measurement........................................................................... 8
1.9 ANSI Functions Supported ................................................................................... 9
1.9.1 ANSI Functions for GRID 1 (Public Grid/Load) Protection............................ 9
Chapter 2: Installation ..........................................................18
2.1 General Warnings/Cautions............................................................................... 18
2.2 Enclosures ......................................................................................................... 19
2.3 Installing the PSM Module ................................................................................. 19
2.4 Installing the Terminal Assembly ....................................................................... 19
2.5 Connector and Cabling Information................................................................... 20
2.5.1 Basic PSM System Connections ............................................................... 20
2.5.2 Overview of PSM System Connection to Public Grid and Generator.......... 21
2.5.3 Power System Connections ..................................................................... 21
2.5.4 Relay Connector for Sync Contacts .......................................................... 24
2.6 Wiring ............................................................................................................... 25
2.6.1 General Wiring Notes .............................................................................. 25
2.6.2 Terminal Assembly Frame Ground Connection ........................................ 26
2.6.3 Wiring Diagrams ..................................................................................... 26
2.7 Scaling for PT and CT Ratios ............................................................................... 32
2.7.1 Example: ................................................................................................. 32
Chapter 3: Configuration and Data Transfer ..........................33
3.1 Configuration Parameters ................................................................................. 33
3.1.1 PSM001 Settings Parameters .................................................................. 33
3.1.2 Grid1 and Grid2 Parameters .................................................................... 34

User Manual Contents
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Contents ii
3.1.3 ANSI Protection Parameters .................................................................... 37
3.1.4 Power Consumption................................................................................ 41
3.1.5 Terminals ................................................................................................ 41
3.2 Data Transfer..................................................................................................... 41
3.2.1 PSM Status Flags ..................................................................................... 41
3.2.2 Mode Control Bits Sent to PSM module ................................................... 50
3.2.3 Parameters sent to PSM Module .............................................................. 54
3.3 Example Configurations..................................................................................... 57
3.3.1 Configuration for 120/240 VAC Single Phase System............................... 57
3.3.2 Configuration for 600VAC Single Phase System....................................... 60
3.3.3 Configuration for 120/208 WYE Three-Phase Four-Wire System .............. 62
3.3.4 Configuration for 120/208 3-Wire Delta system with Two PTs (Two Wattmeter
Method), B-Common .............................................................................. 64
3.3.5 Configuration for 120/208 3-Wire Delta system with Two PTs (Two Wattmeter
Method), C-Common .............................................................................. 66
3.3.6 Configuration for 120/208 4-Wire WYE Synchro/Power Control Connection69
3.3.7 Configuration for 480V 4-Wire WYE Synchro/Power Control Connection . 71
3.3.8 Configuration for 480V 4-Wire WYE Synchro/Power Control Connection. 74
Chapter 4: Diagnostics..........................................................78
4.1 PSM Module LED Indicators ............................................................................... 78
4.2 PSM Module Health Status................................................................................. 78
4.3 Point Faults........................................................................................................ 78
4.3.1 Point Fault Configuration ........................................................................ 79
4.3.2 Fault and No-Fault Contacts .................................................................... 79
Appendix A: Product Certifications and Installation Guidelines for
Conformance............................................................................80
A.1 Agency Approvals.............................................................................................. 80
A.2 Environmental Specifications............................................................................. 81
A.3 Government Regulations................................................................................... 82

GFK-2749A Jan 2020
iii
Warnings, Caution Notes as Used in this Publication
Warning
Warning notices are used in this publication to emphasize that hazardous voltages,
currents, temperatures, or other conditions that could cause personal injury to exist
in this equipment or may be associated with its use.
In situations where inattention could cause either personal injury or damage to
equipment, a Warning notice is used.
Caution
Caution notices are used where equipment might be damaged if care is not taken.
Notes: Notes merely call attention to information that is especially significant to understanding and operating
the equipment.
These instructions do not purport to cover all details or variations in equipment, nor to provide for every
possible contingency to be met during installation, operation, and maintenance. The information is supplied
for informational purposes only, and Emerson makes no warranty as to the accuracy of the information
included herein. Changes, modifications, and/or improvements to equipment and specifications are made
periodically and these changes may or may not be reflected herein. It is understood that Emerson may make
changes, modifications, or improvements to the equipment referenced herein or to the document itself at any
time. This document is intended for trained personnel familiar with the Emerson products referenced herein.
Emerson may have patents or pending patent applications covering subject matter in this document. The
furnishing of this document does not provide any license whatsoever to any of these patents.
Emerson provides the following document and the information included therein as-is and without warranty of
any kind, expressed or implied, including but not limited to any implied statutory warranty of merchantability
or fitness for particular purpose.

User Manual Chapter 1
GFK-2749A Jan 2020
PSM Module Description and Specifications 1
Chapter 1: PSM Module Description and
Specifications
The 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
•Fault monitoring
•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 main 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.
1.1 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 on page 5.
•Provides a cable monitoring function that indicates when the cables linking the PSM
module and Terminal Assembly are correctly installed.
•Can be easily calibrated using the PACTM Machine Edition software to enter calibration
constants for the PSM module and Terminal Assembly.

User Manual Chapter 1
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PSM Module Description and Specifications 2
•The PSM001 module supports hot swap (removal and replacement in an RX3i rack
that is under power).
1.2 PSM Module
In addition to configuring the PSM module upon project download from PME, the RX3i CPU
can control the PSM module by updating configuration data from the RX3i in the form of
%AQ data words and %Q mode control bits during each sweep.
The PSM module provides calculated data to the CPU in the form of %AI data words and %I
status bits each sweep. The information sent by the PSM module includes power system
measurements and discrete fault status.
Connectors
The PSM module provides two Mini-D 20-pin connectors that accept the GRID 1 and GRID 2
voltage and current signals from the Terminal Assembly.
Indicators
Four LEDs provide status indications for the PSM system.
Figure 1

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PSM Module Description and Specifications 3
RUN
Green
The module is operating correctly and communicating with the
RX3i.
Red
The module is operating without backplane communication.
Off
The module is not operating.
FLT
Green,
blinking
During the period when GREEN is ON, Grid 2 can be connected to
Grid 1.
Green,
steady
Grid 1 and Grid 2 can be connected and there are no faults.
Red
The module has detected a fault condition.
Off
The module has not detected a fault and the grids are not
synchronized.
GRID 1
Green
Indicates a voltage signal has been detected on Grid 1.
Red
A frequency out-of-range condition has been detected on Grid 1.
Off
No zero-crossing signal of Grid 1 has been detected during the
last 250 ms time period.
GRID 2
Green
Indicates a voltage signal has been detected on Grid 2
Red
A frequency out-of-range condition has been detected on Grid 2.
Off
No zero-crossing signal of Grid 2 has been detected during the
last 250 ms time period.
1.3 Terminal Assembly
The Terminal Assembly accepts three voltage inputs and four current inputs for each of two
grids. The Terminal Assembly translates the 0–5 A current signals and the 45–690 VAC RMS
voltage signals to low voltage signals for use by the PSM module.
Voltage inputs are connected through external, user-supplied potential transformers (PT).
External, appropriately-sized current transformers (CT) are used to translate grid or load
currents down to the 0–5 A range required by the Terminal Assembly.
1.4 Connectors
The Terminal Assembly provides two terminal blocks, each with 12 screw terminals, for the
voltage and current inputs from the grids. The terminals accept up to 10 AWG wire
commonly used in power utility applications.
The Terminal Assembly provides two pairs of Mini-D 20-pin connectors for connection to
the PSM module using the interface cables. The 45–120 VAC or 120–690 VAC range is
selected by connecting the interface cables to the corresponding pair of Mini-D connectors.
When the cables are connected to the correct grid and matching voltage ranges, the PSM
module provides an indication that the cables are correctly attached to the unit.

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PSM Module Description and Specifications 4
A four-pin pluggable connector provides two isolated solid-state relay contacts that close
when the correct voltage, phase, and relative frequency differences match the configured
criteria for synchronization of the GRID1 and GRID2 signals
Note: The Terminal Assembly is not equipped with CT shorting-bars. These must be provided
separately by the user.
Figure 2
1.5 User-Supplied Equipment
The user must supply the following components depending upon the application. This
equipment includes:
•Current transformers, 5 Amps
•Potential transformers
•Fuses (1 Amp each) for each voltage lead connected to the Terminal Assembly.
•A fuse (1 Amp) for the common or return line for the voltage lead on the Terminal
Assembly.
•A CT shorting block for each current transformer (CT) connection used on the Terminal
Assembly when used with external CTs.
1.6 PSM Part Numbers
Part Number
Description
IC694PSK001
PSM System. Includes a PSM module, a Terminal Assembly and two interface
cables
IC694PSM001
Replacement PSM module
IC694ACC200
Replacement Terminal Assembly

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PSM Module Description and Specifications 5
Part Number
Description
IC694CBL200
One replacement 2m (6.56 ft.) interface cable
IC694ACC201
PSM replacement parts:
two finger guards
four thumb screws
one relay connector
two grounding lug nuts
1.7 Specifications
PSM Module Power Requirements
Backplane Power Consumption
400 mA max. at 5 VDC
Total Power Dissipation
2.0 W max.
Isolation from Backplane
1500 VDC
Host Controller Compatibility
RX3i CPUs
For specific versions supported, refer to “Functional
Compatibility” in the Important Product Information
document, GFK-2748.
Maximum number of PSM modules per
RX3i system
No restrictions, as long as the power supply has sufficient
capacity
Sync Relay contacts
Two isolated relay outputs
General purpose:
125 VAC / 125 VDC maximum at 1 amp
Lamp duty:
125 VAC / 125 VDC maximum at 1 amp
Pilot duty:
125 VAC / 125 VDC maximum at 0.35 amp
Switching speeds
20ms
5ms
Turn-on time
Turn-off time
Measurement Specifications
Three voltage inputs per grid
All voltage data is scaled in 0.1 VAC units.
Impedance
>1 MΩ
Range
Low range
High range
45–150 VAC RMS (120VAC nominal)
120–690 VAC RMS (600VAC CAT IV; 690 VAC CAT III)
Frequency
40–70 Hz
Four current inputs per grid
All current data is scaled in 0.001 Amp units.
Impedance
<5 milliohms
Range
0–5 A RMS (5 A nominal)

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PSM Module Description and Specifications 6
Frequency
40–70 Hz
Phase difference between grids:
±180O
Measurement Accuracy 1
Voltage
0.2% of Full Scale (see page 52)
Current
0.2% of Full Scale (see page 51)
kW, kVAR, kVA
0.4%
kWH, kVARH, kVAH
0.4%
Power factor
1%
Frequency
0.01 Hz
Phase angle
0.1O
Terminal Assembly Input Terminal Ratings
Current
15 Amps continuous maximum
Voltage
690 VAC RMS
Sync Relay contacts
150 VAC/VDC at 1 Amp Resistive, maximum
Note: Actual contact ratings depend on load
type. See “Sync Relay contacts” on page 5.
RX3i CPU Memory Requirement for Automatic Data Exchange
%I
80 bits
%Q
32 bits
%AI
64 words
%AQ
2 words
Data Exchange Time Between RX3i CPU and PSM
A complete data exchange between the PSM and RX3i occurs during each controller scan.
Minimum scan time is 3.5ms per PSM module in the backplane. Minimum data update rate is one
power line period. See “System Operation” on page 7 and “PSM Status Flags” in Chapter 3:.
ANSI Protective Functions
ANSI 25 –Generator and Public Grid Synchronization
ANSI 27 –Under-voltage Protection
ANSI 32 –Reverse Power Protection
ANSI 47 –Voltage Phase Sequence Protection
ANSI 50 –Instantaneous Over-current Protection
ANSI 59 –Over-voltage Protection
ANSI 60 –Voltage (Current) Imbalance Protection
ANSI 81U –Under-frequency Protection
ANSI 81O –Over-frequency Protection