YOKOGAWA PR300 User manual

User’s
Manual
IM 77C01E01-01E
Model PR300
Power and Energy Meter
IM 77C01E01-01E
5th Edition

i
IM 77C01E01-01E
Introduction
Thank you for purchasing the PR300 Power and Energy Meter.
This manual provides information about the procedure for installing, wiring and operating the PR300
Power and Energy Meter, as well as precautions for handling the product. Read this manual carefully
before use, in order to use the product correctly and safely. (Record the parameter settings of the
PR300 on MEMO column in Appendix 4, “Parameter List” of this manual.)
■Intended Readers
This manual is intended for personnel in charge of the installation and wiring, instrumentation and control
equipment, maintenance of equipment, and operation and monitoring.
■Related Documents
The following user’s manuals all relate to the PR300 Power and Energy Meter. Read them as necessary.
Printed manuals
Model PR300 Power and Energy Meter Startup Manual <Installation> Document number: IM 77C01E01-02E
Model PR300 Power and Energy Meter Startup Manual <Initial Setup Operations>
Document number: IM 77C01E01-03E
Electronic manual (PDF file)
Model PR300 Power and Energy Meter Communication Interface User’s Manual (RS-485 and Ethernet Communications)
Document number: IM 77C01E01-10E
■Notes on This Manual
●The contents of this manual are subject to change without prior notice for reasons of performance and/
or functional enhancements.
●Every effort has been made to ensure accuracy in the preparation of this manual. Should any errors or
omissions come to your attention however, please contact your nearest Yokogawa branch or sales
office.
●Reprinting and reproducing the contents of this manual either in part or in their entirety, is prohibited
without the prior consent of Yokogawa.
●The document concerning TCP/IP software has been created by Yokogawa based on the BSD
Networking Software, Release 1 that has been licensed from the University of California.
■Trademark
●All the brands or names of Yokogawa Electric’s products used in this manual are either trademarks or
registered trademarks of Yokogawa Electric Corporation.
●Ethernet is a registered trademark of XEROX Corporation in the United States.
●Company and product names that appear in this manual are trademarks or registered trademarks of
their respective holders.
■Documentation Conventions
Symbols
This manual uses the following symbols.
●Symbols Used in the Main Text
Draws attention to information that is essential to understanding the operation and/or
features of the product.
TIP Gives additional information to complement the present topic.
See Also Gives reference locations for further information on the topic.
■Description of Displays
(1) Some of the representations of product displays shown in this manual may be exaggerated,
simplified, or partially omitted for reasons of convenience when explaining them.
(2) Figures and illustrations representing the PR300’s displays may differ from the real displays in regard
to the position and/or indicated characters (uppercase or lowercase, for example), the extent of
difference does not impair a correct understanding of the functions and the proper operations and
monitoring of the system.
■Revision Information
1st Edition: April, 2006 4th Edition: June 2008
5th Edition: September, 2017
2nd Edition: August, 2006
3rd Edition: February, 2007
NOTE

ii IM 77C01E01-01E
Notices
■Regarding This User’s Manual
• This manual should be passed on to the end user. Keep the manual in a safe place.
• Read this manual carefully to gain a thorough understanding of how to operate this product before you
start using it.
• This manual is intended to describe the functions of this product. Yokogawa Electric Corporation
(hereinafter referred to as Yokogawa) does not guarantee that these functions are suited to the
particular purpose of the user.
• Under absolutely no circumstances may the contents of this manual, in part or in whole, be transcribed
or reproduced without prior consent.
• The contents of this manual are subject to change without prior notice.
• Every effort has been made to ensure accuracy in the preparation of this manual. Should any errors or
omissions come to your attention however, please contact your nearest Yokogawa representative or
our sales office.
■Regarding Protection, Safety, and Prohibition Against Unauthorized Modification
• In order to protect the product and the system controlled by it against damage and ensure its safe use,
be certain to strictly adhere to all of the instructions and precautions relating to safety contained in this
document. Yokogawa does not guarantee safety if products are not handled according to these
instructions.
• The following safety symbols are used on the product and/or in this manual.
●Symbols Used on the Product and in This Manual
This symbol on the product indicates that the operator must refer to an explanation in the user’s manual
in order to avoid the risk of injury or death of personnel or damage to the instrument. The manual
describes how the operator should exercise special care to avoid electric shock, electrocution or other
dangers that may result in injury or loss of life.
Protective Grounding Terminal
This symbol indicates that the terminal must be connected to ground prior to operating the equipment.
CAUTION
● Power supply
Check that the voltage of the power supply agrees with the rated supply voltage of the Meter.
●Protective grounding
To avoid electric shock, be sure to provide protective grounding before turning on the Meter.
●Need for protective grounding
Do not cut the internal or external protective grounding conductor of the Meter or disconnect the
conductor from the protective grounding terminal. In either case, the protective functions of the
Meter will become ineffective, resulting in a hazardous situation.
●Defect of protective grounding
If the protective functions of protective grounding or fuses are assumed to be defective, do not
operate the Meter. Before putting the Meter into operation, check that the protective functions are
normal.
●Use in a gaseous environment
Do not put the Meter in operation in a location where any combustible or explosive gases or fumes
are present. It is extremely dangerous to use the Meter under such conditions.
●Removal of casing
No person except Yokogawa service personnel is allowed to remove the casing. Removing the
casing is hazardous since the Meter contains high-voltage parts.
●External wiring
Securely provide protective grounding before wiring the Meter to the measuring object or external
control circuit.
●Damage to protective construction
Operating the Meter in a way not described in this manual may impair the protective construction of
the Meter.

iii
IM 77C01E01-01E
■Force Majeure
• Yokogawa does not make any warranties regarding the product except those mentioned in the
WARRANTY that is provided separately.
• Yokogawa assumes no liability to any party for any loss or damage, direct or indirect, caused by the
use or any unpredictable defect of the product.
• Be sure to use the spare parts approved by Yokogawa when replacing parts or consumables.
• Modification of the product is strictly prohibited.
• Reverse engineering such as the disassembly or decompilation of the product is strictly prohibited.
• No portion of the product supplied by Yokogawa may be transferred, exchanged, leased, or sublet for
use by any third party without the prior permission of Yokogawa.
Checking the Package
Verify the package as explained below before starting to use the product. Should the delivered product
be wrong or the package be missing any item, contact the vendor from which you purchased the product.
Checking the Model and Suffix Codes
The PR300 bears a nameplate. Confirm that “MODEL” and “SUFFIX” (suffix codes) shown on the
nameplate agree with those of the product ordered.
Model
PR300
Phase and
wire system
Input voltage/
input current
Additional input and
output function
Communication function
Optional measuring function
Power supply
Phase indication format
Suffix Codes
-ⵧⵧⵧⵧⵧ-6 ⵧ-0
-3
-4
-5
1
2
0
1
2
3
0
3
0
3
-6
A
R
-0
Description
Power and Energy Meter
Universal three-phase three-wire system (single-phase two-wire,
single-phase three-wire, and three-phase three-wire systems)
Universal three-phase four-wire system ( single-phase two-wire, single-
phase three-wire, three-phase three-wire, and three-phase four-wire systems )
Three-phase four-wire system (2.5 element)
*1
Universal voltage input
*2
(150 V, 300 V, 600 V) / 1 A
Universal voltage input
*2
(150 V, 300 V, 600 V) / 5 A
1 digital input
1 digital input, 1 analog output
1 digital input, 1 pulse output
1 digital input, 1 analog output, 1 pulse output
RS-485 communication
RS-485 communication, Ethernet communication
*3
None
Demand measurement (1 demand alarm output)
100-240 V AC ±10% (50/60 Hz) or 130-300 V DC ±15%
A, B, and C indications
R, S, and T indications
Always 0
*1 Can be used only when the voltage is in a state of equilibrium.
In cases where “Three-phase four-wire system (2.5 element)”is specified,
the input current specification of 1 AAC is not applicable.
*2 Set the voltage range (150 V, 300 V or 600 V) according to the rated input
voltage to be measured.
*3 For Ethernet communication, the RS-485 communication interface is
exclusively for the Ethernet-serial gateway function.
Rated input voltage
120 V
240 V
480 V
Voltage range
150 V
300 V
600 V
Allowable input voltage
150 V
300 V
600 V
Serial Number (NO.)
Also inform this number shown in “NO.”on the nameplate when contacting the vendor from which you
purchased the PR300.

iv IM 77C01E01-01E
Checking the Accessories
Model PR300
Power and Energy Meter
<Initial Setup Operations>
Model PR300
Power and Energy Meter
<Installation>
(1) JIS/ANSI-mounting kit
Bezel
Panel-mounting bolts (2)
Nuts (2)
Flat washers (2)
Spring washers (2)
Bracket-fixing screws (2)
Panel-mounting bracket
(2) DIN-mounting
brackets
(5) Shorting bar
(6) Tag number labels
(7) Startup Manuals
(for DIN 96-square
instrument panel
mounting)
(for RS-485 communication
termination)
(3) Dust cover
(with 1 fixing screw)
(Installation/Initial Setup Operations)
(4) Terminal cover
(with 3 fixing screws)
Item Name
(1) JIS/ANSI-mounting kit
(2) DIN-mounting brackets
(3) Dust cover
(4) Terminal cover
(5) Shorting bar
(6) Tag number label
(7) Startup manual
Bezel
Panel-mounting bracket
Panel-mounting bolts
Bracket-fixing screws
Flat washers
Spring washers
Nuts
Fixing screw
Fixing screws
Remarks
Used to mount the PR300 according to the ANSI 4-inch round
form size or JIS110-square instrument size.
Used to mount the PR300 according to the DIN 96-square
instrument size.
Attached onto the top of the PR300 main unit.
Attached to the PR300 terminal section. (Must always be
attached to avoid a possible electric shock.)
Used in RS-485 communication if the PR300 is a terminal device.
A quick reference manual for use in initial installation.
Qty
1
1
2
2
2
2
2
2
1
1
1
3
1
2
2
Checking the Package

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Model PR300 Power and Energy Meter
IM 77C01E01-01E
Contents
Introduction....................................................................................................................i
Notices ..................................................................................................................... ii
Checking the Package ................................................................................................ iii
■Checking the Model and Suffix Codes ...................................................................................... iii
■ Checking the Accessories ......................................................................................................... iv
Chapter 1 Installation and Wiring
1.1 Installation with the ANSI 4-inch Round Form or JIS 110-square Instrument Size............ 1-1
External Dimensions ...................................................................................................................1-1
Panel Cutout Dimensions ...........................................................................................................1-1
Mounting Method.........................................................................................................................1-2
1.2 Installation with the DIN 96-square Instrument Size ..........................................................1-3
External Dimensions ...................................................................................................................1-3
Panel Cutout Dimensions ...........................................................................................................1-3
Mounting Method.........................................................................................................................1-4
1.3 Wiring ..................................................................................................................................1-5
Crimping Terminal Recommendations ........................................................................................1-5
Single-phase two-wire system (voltage input, current input, power supply) .............................1-6
Single-phase three-wire system (voltage input, current input, power supply) ........................... 1-6
Three-phase three-wire system (voltage input, current input, power supply) ...........................1-6
Three-phase four-wire system (voltage input, current input, power supply) .............................1-7
Three-phase four-wire system (2.5 element) (voltage input, current input, power supply) ....... 1-7
Other Wiring ................................................................................................................................1-8
1.4 Attaching the Dust Cover and Terminal Cover ...................................................................1-9
Chapter 2 Preparations before Starting Measurement (Set up the PR300 First)
2.1 Component Names and Functions .....................................................................................2-1
2.2 Setting the Phase and Wire System ...................................................................................2-2
Range of Phase and Wire System Options ................................................................................2-3
2.3 Setting the Voltage Range ..................................................................................................2-4
Range of Voltage Range Options ...............................................................................................2-5
Chapter 3 Parameter Setting Operations
3.1 Basic Parameter Setting Operations .................................................................................. 3-1
Methods of Changing Parameter Setpoints ...............................................................................3-1
3.2 Setting the VT and CT Ratios .............................................................................................3-2
Setting the VT Ratio ....................................................................................................................3-2
Setting the CT Ratio ....................................................................................................................3-3
3.3 Setting the Integrated Low-cut Power.................................................................................3-4
3.4 Setting RS-485 Communication Conditions .......................................................................3-6
3.5 Setting Ethernet Communication Conditions ......................................................................3-8
3.6 Setting Pulse Output Conditions .......................................................................................3-10
3.7 Setting Analog Output Conditions .....................................................................................3-12
Relationship between Scale Values and Measurement Inputs (Example) ..............................3-13
3.8 Setting Demand Measurement Conditions .......................................................................3-14
3.9 Setting the Measured Value Display Pattern ....................................................................3-16
3.10 Setting the “Indicator-out”Mode and Locking Parameters...............................................3-19
Setting the Indicator-out Mode..................................................................................................3-19
Locking and Unlocking Parameters ..........................................................................................3-20

TOC-2 IM 77C01E01-01E
Chapter 4 Operation for Display of Measurement Items and Measurement Method
4.1 Measurement Items ............................................................................................................4-1
4.2 Switching Display Pattern ...................................................................................................4-2
Switching Display Pattern ...........................................................................................................4-2
Initial Values and Example Display Patterns ..............................................................................4-2
4.3 Displaying Measured, Instantaneous, and Maximum/Minimum Values .............................4-3
Example Display and Measuring Ranges of Active Power (Regenerative Power) ...................4-3
Example Display and Measuring Ranges of Reactive Power .................................................... 4-3
Example Display and Measuring Ranges of Apparent Power ................................................... 4-3
Example Display and Measuring Ranges of Voltage ................................................................. 4-4
Example Display and Measuring Ranges of Current ................................................................. 4-4
Example Display and Measuring Ranges of Power Factor ........................................................ 4-4
Example Display and Measuring Ranges of Frequency ............................................................4-5
How to Switch between Instantaneous Value, Maximum Value, and Minimum Value .............. 4-5
4.4 Phase Switching for Voltage and Current ...........................................................................4-6
How to Switch the Phase for Single-phase Three-wire, Three-phase Three-wire and
Three-phase Four-wire (2.5 element) Systems ..........................................................4-6
How to Switch the Phase for Three-phase Four-wire System ...................................................4-6
How to Read the Phase Indication Lamp ...................................................................................4-6
4.5 Displaying Energy Values ...................................................................................................4-7
Example Display and Measuring Ranges of Active Energy and Regenerative Energy ............ 4-7
Example Display and Measuring Ranges of LEAD Reactive Energy and LAG Reactive Energy .... 4-7
Example Display and Measuring Ranges of Apparent Energy ..................................................4-7
Operation for Energy Value Display ...........................................................................................4-8
Optional Integrating Function......................................................................................................4-9
4.6 Resetting Measured Values ..............................................................................................4-10
Resetting Maximum and Minimum Values ...............................................................................4-10
Resetting Energy Value.............................................................................................................4-10
Canceling Reset Item Selection (Returning to the Measured Value screen without resetting) ...... 4-11
Reset Items and Details ............................................................................................................ 4-11
4.7 Demand Measurement (Optional Measuring Function) ...................................................4-12
Example Demand Display and Measuring Ranges ..................................................................4-12
Demand Measurement Procedure ............................................................................................4-12
Operation for Demand Measurement .......................................................................................4-13
Demand Alarm ...........................................................................................................................4-14
Example Demand Measurement ..............................................................................................4-14
Chapter 5 Troubleshooting
5.1 Error Display and Recommended Response .....................................................................5-1
5.2 Maintenance ........................................................................................................................5-2
Appendix
Appendix 1 Specifications of PR300 ......................................................................................... A-1
Measuring Function .................................................................................................................... A-1
Power Items and Equations ....................................................................................................... A-2
Input Specifications .................................................................................................................... A-2
Digital Input Specifications ......................................................................................................... A-3
Analog Output Specifications (additional output function) ........................................................ A-3
Pulse Output Specifications (additional output function) .......................................................... A-3
Demand Alarm Output Specifications (optional measuring function) ....................................... A-4
Communication Specifications ................................................................................................... A-4
Standard Performance ............................................................................................................... A-6
Safety and EMC Standards ....................................................................................................... A-7
Environmental Conditions .......................................................................................................... A-8
Mounting and Shape .................................................................................................................. A-8
Appendix 2 System Reset ........................................................................................................... A-9
Appendix 3 Parameter Map....................................................................................................... A-10
Appendix 4 Parameter List ....................................................................................................... A-12
Appendix 5 Alphanumeric Characters Table for ............................................................................
7-segment LED ............................................................................................................... A-16
Index
Contents

1-1
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Installation and Wiring
Chapter 1 Installation and Wiring
1.1 Installation with the ANSI 4-inch Round Form or
JIS 110-square Instrument Size
The PR300 can be installed so that it handles ANSI 4-inch round form or JIS 110-square instruments
panel cutouts by attaching the “JIS/ANSI-mounting kit”accessory.
External Dimensions
2-M5
Bezel
Terminal cover
Dust cover
23
22
2
1 to 10
(Acceptable panel thickness for mounting)
104.5
(126.5) (109)
110
110 109
1.5
Unit: mm
Panel Cutout Dimensions
45±0.3 45±0.3
ø6.5
ø101.6
[ø4.000]
[ø0.312]
ø101
ø7.9
45±0.3
45±0.3
160 min.
[6.299 min.]
160 min.
[6.299 min.]
42.9±0.4
[1.688±0.015] [1.688±0.015]
42.9±0.4 JIS
Multiple Mounting
ANSI
42.9±0.4
[1.688±0.015]
42.9±0.4
[1.688±0.015]
Unit: mm
[approx. inch]
When installing the PR300, provide spacing of 50 mm
or more between each face of the PR300 body and the
instrument next to the PR300 or between each face
and the wall surface.
●Normal Allowable Deviation = (Value of JIS B 0401-1998 Tolerance Grade IT18) / 2

1-2 IM 77C01E01-01E
1.1 Installation with the ANSI 4-inch Round Form or JIS 110-square Instrument Size
●Do not install the PR300 in the following types of
environments, as they may cause the PR300 to
malfunction or fail. Avoid sites:
exposed to significant shock or vibration; where corrosive
gases are present; where large amounts of dust are present;
exposed to water; exposed to direct sunlight; outside; at
altitudes above 2000 m.
● The PR300 mounting position is for vertical panels only.
WARNING NOTE
●Install the PR300 in the secondary side
of the existing breaker.
●Provide spacing of 50 mm or more
between the products.
Mounting Method
Panel-mounting bracket
(standard accessory)
Bezel
(standard accessory)
PR300
Panel-mounting bolt
(standard accessory: 2 bolts)
Panel-mounting bolt
Bracket-fixing screw
(standard accessory: 2 screws)
Flat washer, spring washer, and nut
(standard accessory: 2 of each)
The diagram on the right shows the front of the
bracket (the side into which the panel-mounting
bolt is inserted). Rotating the bracket 90°
makes the bracket compatible with either ANSI
or JIS panel cutouts. Set the bracket to either
the ANSI or JIS mark according to which type
of panel you are installing, as shown in the
diagram on the right.
2
2
1
3
4
5
Insert two panel-mounting bolts
into the front of the panel-
mounting bracket as shown in
the diagram on the left.
Fix the panel-mounting bracket
securely to the back of the PR300
with two bracket-fixing screws as
shown in the diagram on the left.
(recommended tightening
torque: 0.8N•m)
Attach the bezel from the front of
the PR300.
Insert the PR300 from its rear
through the mounting cutout in
the panel as shown in the
diagram.
Secure the PR300’s panel-
mounting bolts by tightening
them with the washers and nuts.
(recommended tightening
torque: 2.0 N•m)
6
6
4
3
5
Front of the bracket
ANSI
Front of the bracket
JIS
Rotate 90°
Set the direction of the panel-mounting bracket.

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Installation and Wiring
1.2 Installation with the DIN 96-square Instrument
Size
External Dimensions
Mounting bracket
(2 places)
109
12.3
112.2
(124.5) (109)
96
110
96
Terminal cover
Dust cover
1 to 10
(Acceptable panel
thickness for mounting)
1.5
Unit: mm
Panel Cutout Dimensions
92 (68)
160 min.
92
(68)
160 min.
+0.8
0
+0.8
0Unit: mm
When installing the PR300, provide spacing of 50 mm
or more between each face of the PR300 body and the
instrument next to the PR300 or between each face
and the wall surface.
●Normal Allowable Deviation = (Value of JIS B 0401-1998 Tolerance Grade IT18) / 2

1-4 IM 77C01E01-01E
1.2 Installation with the DIN 96-square Instrument Size
●Do not install the PR300 in the following types of
environments, as they may cause the PR300 to
malfunction or fail. Avoid sites:
exposed to significant shock or vibration; where corrosive
gases are present; where large amounts of dust are present;
exposed to water; exposed to direct sunlight; outside; at
altitudes above 2000 m.
● The PR300 mounting position is for vertical panels only.
WARNING NOTE
●Install the PR300 in the secondary side
of the existing breaker.
●Provide spacing of 50 mm or more
between the products.
Mounting Method
Insert the PR300 from its rear through the mounting
cutout in the panel as shown in the diagram.
Affix the mounting brackets to the left and right
sides of the PR300. Secure the brackets to the
PR300 by tightening the screws in the end of the
mounting brackets with a screwdriver as shown in
the diagram.
(recommended tightening torque: 0.4 N•m)
Mounting bracket
(standard accessory: 2 brackets)
1
2
2

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Installation and Wiring
1.3 Wiring
WARNING
●As there is a danger of electric shock, turn off the power supply and check that the cables to be
connected are not conducting electricity before carrying out the wiring procedure.
●For safety, be sure to install a circuit breaker switch that conforms to an IEC60947-compatible
product, 5 A, 100 V or 220 V AC near the PR300 so as to be operated easily, and clearly indicate
that the device is used to de-energize the PR300.
●The wiring procedure for the PR300 should be carried out by a qualified person (an electrician etc.)
with knowledge of electrical matters and who has actual experience.
●Install a current transformer (CT) inside a panel when using a conduit for wiring.
●Use a UL Listed Panel only for the panel on which the PR300 is installed.
●If the voltage is below 600 V AC, it is possible to connect the PR300 directly without using a voltage
transformer (VT) and if the current is below 5 AAC, it is possible to do so without using a current
transformer (CT). However, in order to use the PR300 safely, the use of VT and CT is recom-
mended. Use a UL Listed VT and CT for the PR300.
●Perform wiring for the voltage and current input in the same circuit.
●Check the following before turning on the power. Using the PR300 beyond the stated specifications
may cause it to heat up and burn out.
•Check that the power supply voltage, input voltage, and input current values to be applied to the
PR300 agree with its specifications.
• Check thatthe external wiring is connected to the terminals in accordance with the specifica-tions.
●Do not touch the screws in locations (a) to (f) shown in the wiring diagrams. They are an essential
part of the structure of the PR300. Loosening or tightening them may result in a malfunction or
failure of the PR300.
●Be sure to attach the terminal cover to prevent electric shock (refer to Section 1.4) .
NOTE
● When attaching the terminal cover
Since the terminal cover of PR300 has the structure of preventing electric shock, the terminal cover
cannot be attached after completing all wiring. Refer to Section 1.4, “Attaching the Dust Cover and
Terminal Cover”before wiring.
(1) Attach the terminal cover after completing the wiring to the terminals 2, 4, 6, 8, 23, 24, and 25.
(2) Execute the wiring to the terminals other than those mentioned above after attaching the
terminal cover.
If the dust cover is required, attach it before attaching the terminal cover.
● Do not ground the input circuit when connecting voltage and current directly without using VTand CT.
Carry out the wiring referring to the diagrams on pages 1-6, 1-7, and 1-8. The wiring for voltage input,
current input, and power supply is M4 screw terminal connection. For other wiring it is M3 screw terminal
connection. The connector for connecting to the Ethernet is RJ45.
Use strand wires for the wiring. Wiring cables with a nominal cross-sectional area of 1.25 mm2or thicker
are recommended for voltage/current input and power supply; cables with a nominal cross-sectional area
of 0.5 mm2or thicker are recommended for other signals.
Crimping Terminal Recommendations
(A)
(F) (F)
4.7 max.
(ød)
M4
M3
4.4 max.
3.3 max.
7.0 max.
5.8 max.
7.8 max.
6.7 max.
1.2 N•m
0.6 N•m
ød (mm)
Applicable
terminals A
(mm) F (mm)
Recommended
tightening torque
Ring tongue
terminal Spade tongue
terminal
(A)
(ød)
Applicable wire size: 1.04 to 2.63 mm2for M4, 0.25 to 1.65 mm2for M3

1-6 IM 77C01E01-01E
1.3 Wiring
Single-phase two-wire system (voltage input, current input, power supply)
1
23
45
67
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
a
b
c
d
e
f
Lⴙ
Nⴚ
PE
Power supply
Power supply voltage
100-240V AC 10% or
130-300V DC 15%
Power-source side
12
K
LCT
Load side
Fuse
k
l
VT
U
V
1L
1S
P1
P2
Refer to
“Other Wiring”
u
v
NOTE
Do not ground the input
circuit when connecting
voltage and current directly
without using VT and CT.
Single-phase three-wire system (voltage input, current input, power supply)
1
23
45
67
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
u
u
v
v
Lⴙ
Nⴚ
PE
Power supply
Power supply voltage
100-240V AC 10% or
130-300V DC 15%
Power-source side
1N2
K
LCT
K
LCT
Load side
Fuse
VT
k
lk
l
1L
1S
2L
2S
P0
P2
P1
U
U
V
V
Refer to
“Other Wiring”
NOTE
Do not ground the input
circuit when connecting
voltage and current directly
without using VT and CT.
a
b
c
d
e
f
Three-phase three-wire system (voltage input, current input, power supply)
1
23
45
67
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Lⴙ
Nⴚ
PE
Power supply voltage
100-240V AC 10% or
130-300V DC 15%
Power-source side
123
K
LCT
K
LCT
Load side
Fuse
VT
A
(R) B (S) C (T)
k
lk
l
1L
1S
3L
3S
P1
P3
P2
U
U
V
V
u
u
v
v
Refer to
“Other Wiring”
NOTE
Do not ground the input
circuit when connecting
voltage and current directly
without using VT and CT.
a
b
c
d
e
f
Power supply

1-7
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Installation and Wiring
1.3 Wiring
Three-phase four-wire system (voltage input, current input, power supply)
1
23
45
67
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Lⴙ
Nⴚ
PE
Power supply voltage
100-240V AC 10% or
130-300V DC 15%
Power-source side
N1
A
(R) B (S) C (T)
23
K
LCT
K
LCT
K
LCT
Load side
Fuse
VT
k
lk
lk
l
1L
1S
2L
2S
3L
3S
P0
P1
P2
P3
U
U
V
u
u
Uu
v
Vv
Vv
Refer to
“Other Wiring”
NOTE
Do not ground the input
circuit when connecting
voltage and current directly
without using VT and CT.
a
b
c
d
e
f
Power supply
Three-phase four-wire system (2.5 element) (voltage input, current input, power supply)
1
23
45
67
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Lⴙ
Nⴚ
PE
u
u
v
v
Fuse
VT
P0
P3
P1
U
U
V
V
Power supply voltage
100-240V AC 10% or
130-300V DC 15%
Power-source side
N1
A
(R) B (S) C (T)
23
K
LCT
K
LCT
K
LCT
Load side
k
lk
lk
l
1L
1S
2L
2S
3L
3S
Refer to
“Other Wiring”
NOTE
Do not ground the input
circuit when connecting
voltage and current directly
without using VT and CT.
a
b
c
d
e
f
Power supply

1-8 IM 77C01E01-01E
1.3 Wiring
Other Wiring
1
23
45
67
89
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
a
b
c
d
e
f
Color
Description
Color
Description
Link LED
Off
Stopped
Active LED
Off
Stopped
Orange
10Mbps
Orange
Half
duplex
Green
100Mbps
Green
Full
duplex
Ethernet communication
10BASE-T
100BASE-TX
RJ45 connector
Pulse output
Contact capacity
30V DC, 200mA
(resistive load)
14
13
RS-485 communication*1
Aⴚ
R:120  (built-in)
TERM
Bⴙ
SG
17
18
19
20
R
Analog output
Output signal:
4 to 20 mA DC
12
11
+
−
+
−
Contact capacity
30V DC, 200mA
(resistive load)
Demand alarm output
ALM+
ALM−
16
15
Optional integration
control signal or demand
alarm release *2
DIⴙ
DIⴚ
22
21
Switching between 10BASE-T and
100BASE-TX takes place automatically.
Switching between half and full duplex
takes place automatically.
When terminating, short-circuit
terminals 17 and 18 with the
shorting bar.
*1 If Ethernet communication is used, the
RS-485 communication interface is used
specifically for the Ethernet-serial gate-
way function.
*2 In the case of the PR300 with the
demand measuring function, the demand
alarm release is selected.
Voltage signal
ON signal: 4.5 to 25 V DC
OFF signal: within 1V DC

1-9
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Installation and Wiring
1.4 Attaching the Dust Cover and Terminal Cover
WARNING
As there is a danger of electric shock, do not attach the dust cover and terminal cover while the wires are live.
NOTE
●Attach the dust cover before attaching the terminal cover.
●The recommended tightening torque for the screws for attaching the dust cover and terminal cover
is 0.8N•m.
1 Insert the two protruding portions on the underside of
the dust cover into the grooves on the upper side of
the PR300 as shown in the diagram below.
1 Complete the wiring to the terminals 2, 4, 6, 8, 23,
24 and 25, then secure the terminal cover in the
open state shown in the diagram below with the two
screws provided.
2 Complete the wiring to other terminals with the
terminal cover open shown in the diagram below.
3 Close the terminal cover and secure it with the
screw provided as shown in the diagram below.
2 Secure the dust cover with the screw provided as
shown in the diagram below.
Dust cover
(standard
accessory)
Attaching the Dust Cover Attaching the Terminal Cover
Insert into
the ▼
marked
grooves

Preparations before Starting Measurement (Set up the PR300 First)
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Chapter 2 Preparations before Starting Measurement (Set up the PR300 First)
2.1 Component Names and Functions
Power lamp < 1 >
Demand Alarm lamp < 9 >
Pulse Output lamp <10>
Communication lamp <11>
< 2 > Phase and Wire
System lamps
< 3 > Input Range lamps
< 4 > Measured Value display
Upper display
Phase Indication lamps < 7 > < 5 > Unit lamps
DEMAND lamp < 8 >
<12> Operation keys
MAX and MIN lamps < 6 >
Middle display
Lower display
Name
<1> Power lamp
<2> Phase and Wire
System lamps
<3> Input Range lamps
<4> Measured Value
display
<5> Unit lamps
<6> MAX and MIN lamps
<7> Phase Indication lamps
<8> DEMAND lamp
<9> Demand Alarm lamp
<10> Pulse Output lamp
<11> Communication lamp
<12> Operation keys
Display Color
Green
Green
Green
Red
Red
Red
Red
Red
Red
Green
Green
Description
Lights up and remains lit when the PR300 is turned on and operating normally.
Blinks (4 times/second) if a communication error occurs, and continues to blink
until the PR300 returns to normal.
The phase and wire system option set in the PR300 lights up.
The voltage range option set in the PR300 and the current range (rated input) option
specified at the time of ordering light up.
Shows a measured value of power, energy, etc. Also shows a parameter symbol and
its setpoint at the time of parameter setting.
Show the unit symbol of a measured value for each measurement item. These unit
symbols are shown in combination depending on the type of measured value.
Light up when the maximum or minimum measured value is displayed.
Light up to tell for which phase the voltage or current value is being measured.
Lights up when the measured value of demand power or demand current is
displayed. (Only supported for a PR300 with the demand measuring function.)
Lights up if the demand value exceeds the demand alarm point at any point in time
other than the demand alarm mask time.
Lights up when the output is turned on in the pulse output mode and goes out when
the output is turned off.
Blinks while RS-485 or Ethernet communication is in progress.
On the Measured Value screen, this key is used, for example, to switch the display
pattern. Also used to set parameters on the Parameter screen.
On the Measured Value screen, these keys are used, for example, to move from one
digit to another in an energy reading. Also used to set parameters on the Parameter
screen.
On the Measured Value screen, this key is used, for example, to show the
maximum/minimum value. Also used to set parameters on the Parameter screen.
On the Measured Value screen, this key is used, for example, to switch the phase of
voltage/current. Also used to set parameters on the Parameter screen.
This key is used to start or stop demand measurement. The lamp (green) in the key
lights up in the demand measurement.

2-2 IM 77C01E01-01E
2.2 Setting the Phase and Wire System
This section explains how to set the phase and wire system by taking as an example the case when a
three-phase four-wire system is changed to a three-phase three-wire system.
Operation
Operation
Hold down for
at least 3 seconds.
Turn on the PR300.
The Specification Change
Confirmation screen appears.
Measured Value screen
Startup screen
VT Ratio screen
2
1
3
Simultaneously hold
down +
for at least 3
seconds.
Hold down for
at least 3 seconds.
Phase and Wire System screen
6
Specification Change
Confirmation screen
Specification Change
Confirmation screen
4
Press once.
Press once.
Phase and Wire System
screen
Press once to
blink the setpoint.
The parameter (VT ratio)
appears.
The PR300 shows the station
number for about 5 seconds,
then the Measured Value screen
appears.
The Phase and Wire System
screen appears.
The setpoint is confirmed and the PR300
returns to the Phase and Wire System
screen. The phase and wire system
thus set is shown as the current value.
Phase and Wire System
Setting screen
7
The Phase and Wire System
Setting screen appears.
5
Using or ,
show on the
lower display.
Current value
Parameter symbol for
phase and wire system
Current value
Setpoint
Phase and Wire System
Setting screen
8
Press once while
the setpoint is blinking.
9
Phase and Wire System
Setting screen
10
When proceeding to set the
voltage range, start from step
6in Section 2.3, “Setting the
Voltage Range,”with this
screen (figure on the left)
shown as is.
To re-set the parameter:
Press any key other than
while all digits of the
setpoint are blinking.
The PR300 returns to the initial
setting screen.
Using or ,
select the setpoint.

Preparations before Starting Measurement (Set up the PR300 First)
2-3
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2.2 Setting the Phase and Wire System
Measured Value screen
Startup screen
The PR300 shows the Startup
screen for about 5 seconds, then the
Measured Value screen appears.
Setting completed.
NOTE
If you change the phase and wire system, all parameters other than those related to RS-485 and
Ethernet communications are initialized (to factory-set values). Change the phase and wire system
before setting parameters such as the VT and CT ratios.
Range of Phase and Wire System Options
Parameter
Symbol Model and Suffix Codes
Parameter
Name Setting Type Setting Range (Details)
Initial Value
(Factory-set
Value)
Phase and
wire system
Selection
Single-phase
two-wire system
Single-phase
three-wire system
Three-phase
three-wire system
Single-phase
two-wire system
Single-phase
three-wire system
Three-phase
three-wire system
Three-phase
four-wire system
Three-phase
four-wire system
(2.5 element)
Three-phase
three-wire
system
Three-phase
four-wire
system
Three-phase
four-wire system
(2.5 element)
NOTE
●If single-phase three-wire system is selected, the voltage range is fixed at 300 V (between P0 and
P1, P0 and P2). The voltage range cannot be selected.
●Three-phase four-wire system (2.5 element) can be used only when the voltage is in a state of
equilibrium. In addition, the phase and wire system cannot be changed.

2-4 IM 77C01E01-01E
2.3 Setting the Voltage Range
This section explains how to set the voltage range by taking as an example the case when the voltage
range is changed from 300 V to 600 V.
Operation
Operation
Hold down
for at least 3 seconds.
Turn on the PR300.
The Specification
Change Confirmation screen
appears.
Measured Value screen
Startup screen
VT Ratio screen
2
1
3
Phase and Wire System screen
6
Specification Change
Confirmation screen
Specification Change
Confirmation screen
4
Press once.
The parameter (VT ratio)
appears.
The PR300 shows the station
number for about 5 seconds,
then the Measured Value screen
appears.
The Phase and Wire System
screen appears.
The Voltage Range Setting
screen appears.
The Voltage Range screen
appears.
Voltage Range screen
7
5
Using or ,
show the Voltage
Range screen.
Voltage Range Setting screen
Voltage Range Setting screen
Voltage Range Setting screen
8
9
10
Current value
Setpoint
Press once.
Parameter symbol
for voltage range
Press once to
blink the setpoint.
Press once while
the setpoint is blinking.
Simultaneously hold
down +
for at least 3
seconds.
Using or ,
show on the
lower display.
Using or ,
select the setpoint.
To re-set the parameter:
Press any key other than
while all digits of the
setpoint are blinking.
The PR300 returns to the initial
setting screen.