DPMS XPQ User Manual

POWER INSTRUMENTS

DPMS XPQ Multi-Function Power Meter

User Manual 1087-332

I

POWER INSTRUMENTS

Copyright 2008© V1.0

This manual may not be reproduced in whole or in part by any means,

without the expressed written consent of AMETEK.

The information contained in this document is believed to be accurate at

the time of publication, however, AMETEK assumes no responsibility for any

errors which may appear here and reserves the right to make changes without

notice. Please ask your local representative for the latest product specications

before ordering.

II

DPMS XPQ User Manual

Please read this manual carefully before installation, operation and

maintenance of the DPMS XPQ meter.

The following symbols are used in this user’s manual and on the DPMS

XPQ meter to alert the danger or to prompt in the operating or setting process.

Danger symbol, Failure to observe the information may result in

injury or death.

Alert symbol, Alert to potential danger. Observe the information

after the symbol to avoid possible injury or death.

Installation and maintenance of the DPMS XPQ meter should only be

performed by qualied, competent personnel that have appropriate training and

experience with high voltage and current devices.

AMETEK is not liable for any problems that occur under proper operation.

III

POWER INSTRUMENTS

content

Chapter 1 Introduction……………………………………………………………………………6

Purpose..................................………………………………………………………7

Application Area..............................………………………………………………………9

Function......................................………………………..……………………………9

Comparison......................................………………………………………….………10

Chapter 2 Installation……………………………………………………………………………12

Appearance and Dimensions……………………..……………………………………13
Installation Method…………………………………………………….……….….……14

Wiring.......................………………………………………………...……………………17

Chapter 3 Meter Operation and Parameter Setting…………….…………………………36

Display Panel and Key………………………………….………………………………37
Metering Data Reading…………………………………...……………….……………39
Statistics Display……………………...…………………………………………………43

Meter Parameter Setting…………….………………….…....…………………………44

Energy Parameter Setting……………………………….………………………..……51
Voltage Eligibility Parameter Setting…………….……….……………………………53

Chapter 4 Function and Software…………………………….………………………..……56

Basic Analog Measurements……………………………....…………………….………57

Event Alarming…………………………………………………………..………………74

Chapter 5 Communication……………………………………………………..…….…………86

Introducing Modbus Protocol…………………….….….………………..………………87
Format of the communication………………………………….….……………………..90

Data Address Table and Application Details........................…..………………………96

Appendix……………………………………………………..……………………..……………122

Appendix A Technical Data and Specication………………………………………123

Appendix B Ordering Information………………………………………………..……127

IV

DPMS XPQ User Manual

Getting Started!

Congratulations!

You have received an advanced, versatile, multifunction power meter, also

known as a Remote terminal unit (RTU), which will greatly benet your power

system.

When you open the package, you will nd the following items.

1. DPMS XPQ meter 1

2. 14-Pin terminal 2

3. Installation clips 4

4. User’s operation manual 1

5. Maintenance guarantee card 1

Please read this manual carefully before operating or setting the meter to
avoid unnecessary results. You can read only part of this manual depending on
how you use the meter.

Chapter 1 helps you to understand the fundamental function, specication

and application area.

Chapter 2 describes detailed installation and wiring.

Chapter 3 describes the data display and parameter setting method.

Chapter 4 outlines the functions of the meter and the way to use them.

Chapter 5 gives the address table.

Appendix lists the technical data and specifications and ordering
information.

Chapter 1 Introduction

Purpose

Application Area

Functions

DPMS XPQ Series

5

6

DPMS XPQ User Manual

Purpose

Powerful Multifunction Power Meter

The DPMS XPQ series multifunction power meter is the new generation of

the very popular DPMS. It has more functions and higher accuracy. It not only

integrates three-phase energy measuring and displaying, energy accumulating,

harmonic measuring, malfunction alarm, statistics and records, digital input /

output and network communication, but also contains the following functions:

four quadrant energy measuring, time-of-use (TOU), auto-freezing, waveform

and over range waveform capture, programmable over range alarming,

schedule of events, trending records etc. Graceful and high-lighted back light

makes it easy to check the measuring data. Simple HMI interface makes it easy

to master. The multi-row display lets you observe various data without touching

any keys.

Ideal Choice for Electric Automation SCADA System

The DPMS XPQ can be used to replace all traditional electric meters.

It also can be used as a Remote Terminal Unit (RTU) for monitoring and

controlling in a SCADA system. All the measured data is available via digital

RS485 communication ports running the ModbusTM protocol.

Energy Management

The DPMS XPQ can measure double direction four quadrant kWh and

kVARh with accuracy up to class 0.5S of IEC60253-22. It can provide maximum/

minimum energy data and energy demand data. With the help of software, you

can easily know how the load and energy are running. It also gives you all kinds

of measurement tables.

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POWER INSTRUMENTS

Remote Power Control

The main function of the DPMS XPQ is measurement, but it also has some

exible I/O functions. This makes the meter very useful as a distributed RTU

(metering, monitoring, remote controlling in one unit).

Power Quality Analysis

With the powerful digital signal processing ability, the DPMS XPQ intelligent

power meter can be used as an online power quality analysis instrument. It can

simultaneously and continuously give out the analysis results such as THD of

voltage and current, harmonics up to the 31st order and an unbalance factor of

voltage and current, etc. Main functions of the DPMS XPQ are listed in table 1.1.

Metering Energy

VLN, VLN average, VLL, VLL average.
I, I average, IN.
Power, Reactive Power, Apparent Power and Power
factor of each phase and total.
Frequency.

Bidirectional, four quadrants and system Energy,
Reactive Energy, Apparent Energy
Programmable energy freezing.
Period Energy, Reactive Energy, Apparent Energy
Four time zone schedules.

Statistics and Records Energy and Demand

Max/Min value of statistics with time stamp
Maximum of Demand
SOE, Waveform capture and records

kWh, kVARh of 4 quadrants:
Import, Export, Total, Net
Demand of Power and Reactive Power

Power Quality Analysis Over range Alarming

THD, Even THD and Odd THD of Voltage, Current
Harmonics and Crest factor of Voltage
Telephone Harmonic waveform Factor (THFF).
Harmonics and K Factor.
Unbalance Factor of Voltage and Current.
Statistics of Voltage Eligibility.

Monitor up to 240 parameters.
Programmable parameter limitations.
Programmable alarming logic.
Alarming outputs combined with DO or Relays.
Auto-recording of alarming events.
Alarming-trigger waveform recording.

Communication I/O port and Control

RS485 Communication port.
Modbus RTU Protocol

4 Digital Input (DI) (Wet or Dry)
2 Relay Output and 2 Digital Output (DO)

Table 1.1 Main functions of the DPMS XPQ series

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DPMS XPQ User Manual

Application Area

Power Distribution Automation Intelligent Electric Switch Gear

Industry Automation Building Automation

Energy Management System Large UPS System

Function

Multifunction, High Accuracy

The DPMS XPQ sSeries multifunction Intelligent power meter is powerful

in data collecting and processing. Electric power parameters; metering,

energy accumulating ,harmonic measuring, malfunction alarming, statistics

and records, digital input /output and network communication, four quadrant

energy measuring, time-of-use(TOU), auto-freezing, waveform and over range

waveform capture, programmable over range alarming, schedule of events,

trending records etc.

Accuracy of Voltage and Current is 0.2%, True-RMS

Accuracy of Power and Energy is 0.5%, four quadrants metering.

Small Size and Easy Installation

With the size of DIN96 ×96 and 55mm depth after mounting, the DPMS

XPQ can be installed in a small cabin. The fixing clips are used for easy

installation and removal.

Easy to Use

With a large high density LCD screen, the display of the DPMS XPQ is

easy to read and use. All the setting parameters can be accessed by using

panel keys or a communication port. The setting parameters are protected in

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POWER INSTRUMENTS

EEprom, which will maintain its content after the meter is powered off. With the

backlight of the LCD, the display can be easily read in a dim environment. The

back light “on” time is selectable.

Multiple Wiring Modes

The DPMS XPQ can easily be used in either: high voltage, low voltage,

three phase three wires, three phase four wires or a single phase system.

High safety, high stability, the DPMS XPQ was designed according to industrial

standards. It can run stably under high power disturbance conditions as it has

passed IEC and CE.

Comparison

To meet different demands of customers, the DPMS XPQ series consists

of four types: DPMS XPQ-D (time-of-use pattern), DPMS XPQ-E (power quality

pattern), DPMS XPQ-F (waveform and alarming pattern) and DPMS XPQ-G

(general function pattern). In order to introduce them all, this manual is based

on the DPMS XPQ-G. Other patterns may not contain some functions so please

refer to the following table carefully.

Table 1.2 Comparison of the DPMS XPQ series

Function

D E F G

Basic parameters ● ● ● ●
Digital I/O ● ● ● ●
Demand ● ● ● ●
Basic settings ● ● ● ●
Device property ● ● ● ●

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DPMS XPQ User Manual

Harmonics THD Phases and all ● ● ●

phase ● ●
Voltage harmonic analysis ● ●
current harmonic analysis ● ●

Function

D E F G

Sequence ● ● ●
phase angle ● ● ●
Energy Real time ● ● ● ●

Current month TOU ● ●
Previous month TOU ● ●
Accumulative TOU ● ●
Frozen Real time ● ●

Current month TOU ● ●
Accumulative TOU ● ●

MAX/MIN Current ● ●

Previous ● ●

Voltage eligibility Daily, Monthly, Yearly, Frozen,

Accumulative

● ●

SOE log ● ●
Alarm log ● ● ●
Waveform log

● ●

Trending log ● ●
System status Alarming record ● ● ●

SOE, waveform, trending ● ●
Schedule of TOU ● ●
Run time

● ● ● ●

Alarm Alarming ● ● ●

Waveform triggering ● ●

Others Max and Min recording mode ● ● ●

Trending settings ● ●

Chapter 2 Installation

Appearance and Dimensions

Installation Method

Wiring

11

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DPMS XPQ User Manual

Note: Before trying to operate the meter, note the functions according to its
pattern. The installation method is introduced in this chapter. Please read this

chapter carefully before beginning installation work.

Appearance and Dimensions

Fig 2.1 Appearance of the DPMS XPQ

PART NAME DESCRIPTION

1. Enclosure

The DPMS XPQ enclosures are made of high strength anti­combustible engineered plastic

2. Front

Casing After the installation, this part is before the panel. The color of
the front casing is optional

3. LCD Display Large bright blue backlight LCD Display

4. Key

Four keys are used to select display and to set parameters of the
meter

5. Input Wiring Terminals Used for Voltage and Current input

6. Auxiliary Wiring Terminals Used for auxiliary power, communication and DI

7. Extend Wiring Terminals Auxiliary I/O wiring terminals

8. Installation Clip The clips are used for xing the meter to the panel

Table2.1 Part Names of the DPMS XPQ

3

1

2

4

8

5

7

6

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POWER INSTRUMENTS

Dimensions

Fig 2.2 Dimensions

Installation Method

Environmental

Before installation, please check the environment temperature and humidity

to ensure the DPMS XPQ meter is being placed where optimum performance

will occur.

Temperature

Operation: -25 - 70 deg.

Storage: -40 - 85 deg.

Humidity

5% - 95% non-condensing

96.00

96.00

55.00

96.00

43.00

38.50

Front

Side

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DPMS XPQ User Manual

The meter should be installed in a dry and dust free environment and avoid

heat, radiation and high electrical noise sources.

Maximum Altitude: 2,000m

Site Requirement: Indoor Use

Installation Steps

Normally, meters are installed on the panel of switch gear.

1. First, cut a square hole on the panel of the switch gear. The cutting size

is in g 2.3 Unit (mm)

Fig 2.3 Panel Cutting

2. Second, remove the clips from the meter and insert the meter into the

square hole from the front side.

Fig 2.4 Put the meter into the square hole

Cut

panel

90±

0.5

0.0

90±

0.5

0.0

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POWER INSTRUMENTS

3. Finally, install clips back on the meter from the backside and push the

clip tightly so that the meter is afxed on the panel.

Fig 2.5 Use the clips to afx the meter on the panel

Space required for Installation

The space around the meter should be large enough so that the meter

removal, terminal strip wiring and wire arrangement could be done easily. The

recommended minimum space around the meter is shown in Table 2.2 and Fig

2.6.

Fig 2.6 Space around the meter

panel

Paneld

c

e

b

a

f

g

panel

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DPMS XPQ User Manual

Environment Temperature Minimum Distance(mm)

a b c d e f g

＜50＜ 25 25 38 38 64 25 25
≥50＜ 38 38 51 51 76 38 38

Table 2.2 Minimum Space

Wiring

Terminal Strips

There are three terminal strips on the back: Voltage & Current input,

Auxiliary and Extend. Only the DPMS XPQ with the PRIO option has the Extend

Terminal Strip. The 1, 2 and 3 are used to represent each phase of a three

phase system. They have the same meaning with A, B and C or R, S and T in a

three phase system.

Voltage & Current Input Terminal Strip

Auxiliary Terminal Strip

Note: NC means No Connection

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POWER INSTRUMENTS

Extend Terminal Strip

Fig 2.7 Terminal Strips

Safety Earth Connection

Before doing the meter wiring connection, please

make sure that the switch gear has a safety Earth

system. Connect the meter safety earth terminal to the

switch gear safety earth system. The following safety

earth symbol is used in this user’s manual.

Auxiliary Power

The auxiliary power supply of the meter is 100-

240Vac (50/60Hz) or 100-300Vdc. The meter’s typical

power consumption is less than 2W. A regulator or a

UPS should be used when the power supply undulates

too much. The terminals for the auxiliary power supply

are 20, 22 and 24 (L, N, G). A switch or circuit-breaker should be included in the

building installation, and it should be in close proximity to the equipment and

within easy reach of the operator, and it should be marked as the disconnecting

device for the equipment.

DANEROUS

Only qualied personnel

s h o u l d d o th e w i r e
connection work. Make
sure the power supply
is off and all the wires
are powerless. Failure to
observe this may result
in severe injury or death.

Note

Make sure the auxiliary
power terminal of the
meter, G, is connected
to th e safety Ea r t h of
switchgear.

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DPMS XPQ User Manual

Fig 2.8 Wiring of Power Supply

A fuse (typical 1A/250Vac) should be used in the auxiliary power supply

loop. No.24 terminal must be connected to the safety earth system of

switchgear. An isolated transformer or EMI lter should be used in the auxiliary

power supply loop if there is a power quality problem in the power supply.

Fig 2.9 Wiring of Aux. Power Supply with power line lter

Choice of wire should be AWG22~16 or 0.6~1.3mm2.

Note: A lter should be used if there is an EMI problem.

Voltage Input

Meter input voltage should be 40~230Vac L-N,

60~400Vac. L-L. The voltage input could be directly

connected to the meter terminal without the use of PT if

the voltage system is less than 400Vac (L-L). If the input

Voltage is higher than 400Vac, a PT or VT should be

Note

The secondary of PT
c a n n o t be sh o r t ed ,
otherwise it may cause
the severe damage of
the instrument.

Note

Mak e sure th e po we r
supply voltage is the
same as what the meter
needs fo r its auxiliary
power.

L

N Acuvim-X

G

20

22

24

Power Supply

1A FUSE

Ground

L

N Acuvim-X

G

20

22

24

L L

N N

G G

Power Supply

1A FUSE

Ground

Power

lter

19

POWER INSTRUMENTS

used. A fuse (typical 1A/250Vac) should be used in the voltage input loop. A PT

should be used to transform the high voltage into the measurement range of the

meter if it is used in a high voltage system. The wire gauge of the input voltage

should be AWG16~12 or 1.3~2.0mm

2

.

Note: In no circumstances should the PT secondary be shorted. The PT

secondary should be well grounded at one end.

Current Input

In a practical engineering application, CTs should be installed in the

measuring loop. Normally the CT secondary is 5A. 1A is possible as an option.

A CT accuracy over 0.5% (rating over 3VA) is recommended and it will inuence

the measuring accuracy. The wire between the CT and meter should be as short

as possible. The length of the wire may increase the error of the measurement.

CTs must be required for rated current over 5A.

The wire guage of the input current should be AWG15~10 or 1.5~2.5mm2.

Note: The CT loop should not be open in any circumstances when the power

is on. There should not be any fuse or switch in the CT loop and one end of the

CT loop should be connected to the ground.

Vn Connection

Vn is the reference point of meter input voltage. The lower the wire

resistance the lower the error.

Three phase wiring diagram

The DPMS XPQ can satisfy most kinds of three phase wiring diagrams.

Please read this part carefully before you begin to do the wiring so that you may

chose a wiring diagram suitable for your power system.

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DPMS XPQ User Manual

The voltage and current input wiring mode can be set separately in the meter

parameter setting process. The voltage wiring mode could be 3-phase 4-line

Wye (3LN), 3-phase 4-line 2PT Wye mode (2LN) and 3-phase 3-line open delta

(2LL). The current input wiring mode could be 3CT, 2CT and 1CT. Any voltage

mode could be grouped with one of the current modes.

Voltage Input Wiring

3-Phase 4-Line Wye mode (3LN)

The 3-Phase 4-Line Wye mode is commonly used in low voltage electric

distribution power systems. The power line can be connected to the meter

voltage input directly as in g 2.10a. In the high voltage input system, 3PT Wye

mode is often used as in g 2.10b. The voltage input mode of the DPMS XPQ

should be set to 3LN for both voltage input wiring modes.

Fig 2.10a 3LN direct connection

Acuvim-X

21

POWER INSTRUMENTS

Fig 2.10b 3LN with 3PT

3-Phase 3-Line direct connection mode (3LN)

In a 3-Phase 3-Line system, power line A, B and C are connected to V1, V2

and V3 directly. Vn is oated. The voltage input mode of the DPMS XPQ should

be set to 3LN.

Fig 2.11 3LN 3-Phase 3-Line direct connection

Acuvim-X

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DPMS XPQ User Manual

3-Phase 4-Line 2PT mode (2LN)

In some 3-Phase 4-Line Wye systems, 2PT Wye mode is often used as in

g 2.12. It is supposed that the 3 phases of the power system are balanced. The

voltage of V2 is calculated according to V1 and V3. The voltage input mode of

the DPMS XPQ should be set to 2LN for 2PT voltage input wiring mode.

Fig 2.12 2LN with 2PTs

3-Phase 3-Line open Delta Mode (2LL)

Open delta wiring mode is often used in high voltage systems. V2 and

Vn connect together in this mode. The voltage input mode of the DPMS XPQ

should be set to 2LL for voltage input wiring mode.

Fig 2.13 2LL with 2PTs

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POWER INSTRUMENTS

Current Input Wiring

3CT

All current input of a three phase system can be viewed as 3CT, whether

there are 2 CTs or 3 CTs on the input side. The current input mode of the DPMS

XPQ should be set to 3CT for this current input wiring mode.

Fig 2.14 3CT-a

Fig 2.15 3CT-b

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DPMS XPQ User Manual

2CT

The difference in g. 2.16 and g. 2.15 is that there is not current input in

the I21 and I22 terminals. The I2 value is calculated from formula i1+i2+i3=0.

The current input mode of the DPMS XPQ should be set to 2CT for this current

input wiring mode.

Fig 2.16 2CT

1CT

If it is a three phase balanced system, a 1 CT connection method can be

used. The other two currents are calculated according to the balance supposing.

Fig 2.17 1CT

25

POWER INSTRUMENTS

Frequently used wiring method

The voltage and current wiring method are put together in one drawing.

The DPMS XPQ meter will display normally only if the setting of the meter is

associated with the wiring of the voltage and current input.

1. 3LN, 3CT with 3 CTs

Fig 2.18 3LN, 3CT with 3CTs

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DPMS XPQ User Manual

2. 3LN, 3CT with 2 CTs

Fig 2.19 3LN, 3CT with 2 CTs

3. 2LN, 2CT

Fig 2.20 2LN, 2CT

27

POWER INSTRUMENTS

4. 2LN, 1CT

Fig 2.21 2LN, 1CT

5. 2LL, 3CT

Fig 2.22 2LN, 3CT

Acuvim-X

Fig 2.21 2LN, 1CT

28

DPMS XPQ User Manual

6. 2LL, 2CT

Fig 2.23 2LL, 2CT

7. 2LL, 1CT

Fig 2.24 2LL, 1CT

29

POWER INSTRUMENTS

8. Single Phase 2 Line (Wiring mode setting 3LN, 3CT)

Fig 2.25 Single Phase 2 Lines

9. Single Phase 3 Line (Wiring mode setting 3LN, 3CT)

Fig 2.26 Single Phase 3 Line

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DPMS XPQ User Manual

Wiring of Digital Inputs

There are two digital inputs of wet contact in the standard DPMS XPQ. The

terminals of the two digital inputs are DI1+, DI1- (15, 16) and DI2+, DI2- (17,

18). Additional two digital inputs are optional. The terminals of the two additional

digital inputs are DI3+, DI3-(25, 26) and DI4+, DI4-(27, 28). The circuit drawing

of the digital input is simplied in g 2.27.

g 2.27 Digital Input Circult of the DPMS XPQ

The auxiliary power supply for the digital input is 12~24Vdc. If the

connection wire is too long, a relative higher voltage should be adopted. The

current in the loop line should be 10mA~15mA, and the Max current is 30mA.

A DI auxiliary power supply (optional) is provided for the convenience of

eld use. The voltage of the DI auxiliary power supply is 15Vdc (1W). The wiring

terminals are V+ and V- (29, 30). This power supply can not be used for any

other purpose.

The 4 DIs with the auxiliary power supply is in g 2.28. The wire for digital

input should be between AWG22 (0.5mm2)~ AWG16 (1.3mm2).

Acuvim-X

Optical
Isolator

31

POWER INSTRUMENTS

Fig 2.28 Digital Input with Auxiliary Power

Relay Output (RO)

There are two additional relay output options for the DPMS XPQ. The

terminals are R11, R12 (31, 32) and R21, R22 (33, 34). These two relay outputs

are used for remote control electric switches in the power system.

The relay type is mechanical Form A contact with 3A/250Vac or 3A/30Vdc.

A mediate relay is recommended in the output circuit shown in g 2.29.

Fig 2.29 Relay output

Acuvim-X

Mediate Rel ay

Contr ol

output

Power

Supply

Acuvim-X

32

DPMS XPQ User Manual

There are two mode selections for relay output, one is latching, and the

other is momentary. For the latching mode, the relay can be used to output two

states, on or off. For the momentary mode, the output of the relay changes from

off to on for a period of time Ton and then goes off. Ton can be set from 50-

3000ms.

The wire for relay output should be between AWG22 (0.5mm2)~AWG16

(1.3mm2).

Digital Output (DO)

There are two digital outputs as an option. The terminals of the digital

output are DO1+, DO1-(35, 36) and DO2+, DO2-(37, 38). These two digital

outputs can be used as an energy pulse output or over limit alarming output.

The digital output circuit form is Photo-MOS. The simplied circuit is in g 2.30.

Fig 2.30 Digital output Circuit

The Max output voltage and current are 100V and 50mA.

When the digital output is used as pulse output, DO1 and DO2 can be

Power

Supply

Acuvim-X

Photo -Mos

33

POWER INSTRUMENTS

programmed as energy pulse output. For example, DO1 is used as energy

pulse output and DO2 is used as reactive energy pulse output. The pulse width

and pulse constant can be set.

When the digital output is used as an over limit alarm output, the upper and

lower limit of the parameter, time interval and output port can be set. A drawing

of the alarming output with beeper is in g 2.31.

g 2.31 Do Alarming Circult

The wire for digital output should be between AWG22 (0.5mm2) ~AWG16

(1.3mm2).

Communication

The communication port and protocol of the DPMS XPQ are RS485 and

Modbus-RTU. The communication terminals are A, B, and S (11, 12, 13). A is

differential signal +, B is differential signal - and S is connected to the shield of

the twisted pair cable. Up to 32 devices can be connected on an RS485 bus.

Use good quality shielded twisted pair cable, AWG22 (0.5mm2) or larger. The

Power

Supply

Photo -Mos

Acuvim -X

Beeper

34

DPMS XPQ User Manual

overall length of the RS485 cable connecting all devices can not exceed 1200m

(4000ft). The DPMS XPQ is used as a slave device of a master like a PC, PLC,

data collector or RTU.

If the master does not have an RS485 communication port, a converter has

to be used. Normally a RS232/RS485 or USB/RS485 is adopted. The topology

of RS485 net can be line, circle and star.

1. Line

The connection from master to meter is one by one in the RS485 net as in

g 2.32.

g 2.31 Line Mode

In g 2.32 the Rt is an anti-signal reecting resistor 120-300 ohm/0.25W.

Normally, it is added to the end of the circuit beside the last meter, if the

communication quality is not good.

2. Circle

Meters are connected in a closed circle for the purpose of high reliability.

There is no need for anti-signal reecting resistors.

Converter

Acuvim-X Acuvim-X Acuvim -X

Master

PC

35

POWER INSTRUMENTS

g 2.31 Circle Mode

3. Star

The connection for RS485 net is in Wye mode. An anti-signal reflecting

resistor may be needed in each line.

g 2.31 Star Mode

Master

PC

232 /485

Converter

Acuvim-X Acuvim-X Acuvim-X

Acuvim-X

Acuvim-X Acuvim-X

Master

PC

232 /485

Converter

Acuvim-X Acuvim-X Acuvim-X

Acuvim-X

Acuvim-X Acuvim-X

36

DPMS XPQ User Manual

Recommendations for high quality communication:

 

Good quality shielded twisted pair of AWG22 (0.6mm2) or larger is very

important.

 

The shield of each segment of the RS485 cable must be connected to

the ground at one end only.

 

Keep communication cables as far away as possible from sources of

electrical noise.

 

Use an RS232/RS485 or USB/RS485 converter with optical isolated

output and surge protection.

Chapter 3 Meter Operation and

Parameter Setting

Display Panel and Keys

Metering Data Reading

Statistics Display

Meter Parameter Setting

Energy Parameter Setting

Voltage Eligibility Parameter Setting

37

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DPMS XPQ User Manual

Detailed human-machine interface of the meter will be described in this

chapter. It includes how to get the metering data and how to do the parameter

setting. This chapter is based on the DPMS XPQ-G, but other patterns can be

operated the same way.

Display Panel and Key

There is one display panel and four keys in the front of meter. All the

display segments are illustrated in g 3.1.

g 3.1 All display segments

4 5 6 7 81 2 3

1

13

7

2

12

1110

9

8

6

5

4

3

Fig 3.1 All Display Segments

39

POWER INSTRUMENTS

Table 3.1 Display Panel description

SN Display Description
1

Four lines of letter in
the
metering area

Display metering data: Voltage, Current, Power, Power
factor, Frequency, THD, Demand, Unbalance factor,
Max/Min Value etc.

2

One line of letter in
the energy display area

Energy data display or real time clock

3

Load rate Display load current to rating current percentage

4

Item label letter,
MAX, MIN, Demand,
PF and F

Item label:
U: voltage, I: current, P: power, q: reactive power, S:
apparent power, PF: power factor, F: frequency, MAX:
Maximum value, MIN: Minimum Value, Demand:Demand
value, Avg: average value, I with N: neutral current, PF, F,
Avg and N indicate the data in the fourth line.

5

Three phase
unbalance label

With letter U: Voltage unbalance factor
With letter I: Current unbalance factor

6

Load characteristic Capacitor label: capacitive load; Inductor: inductive load

7

TOU indicator 1, 2, 3, 4 stands for sharp, peak, normal and valley

8

Energy label imp: consumption energy; exp: generating energy;

total: absolute sum of imp and exp energy;
net: algebraic sum

9

Communication indicator No label: no communication; One label: inquiry

Two labels: inquiry and answer

10

Energy pulse
output indicator

No label: no pulse output;
With label: pulse output

11

Digital input indicator Switch 1 to 4 indicate DI1 to DI4

12

Time label Time display in energy area

13

Unit Indicate data unit

Voltage: V, kV, Current: A, Power: kW and MW, Reactive
Power: kVar and MVar, Apparent Power: kVA and MVA,
Frequency: Hz, Energy: kWh, Reactive Power: kVARh,
Percentage: %

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DPMS XPQ User Manual

There are four keys on the front panel, labeled as H, P, E and V/A from left

to right. Use these four keys to read metering data and set the parameters.

Metering Data Reading

Normally, it displays the metering data, such as voltage, current, power etc.

There are several key patterns: press H, P, E, V/A and press key P and key V/A

simultaneously.

Press V/A to read voltage and current in the

metering area. The screen will roll to the next

display as you press V/A each time. It will go

back to the first screen if you press V/A at the

last screen.

Table on the left shows you how it scrolls:

Note: When the meter is set to “2LL”, there

is no phase voltage and neutral current display.

So only the third, fourth and fth screens will be

displayed.

Line

Voltage & avg

Curr ent & avg

Three phase C ur rent

demand

Three phase

Voltage & avg

Three phase

Curr ent & avg

V/A

V/A

V/A

V/A

V/A

41

POWER INSTRUMENTS

Press P, to display power related data. The

screen will scroll to the next display as you press

P each time. It will go back to the rst screen if you

press P at the last screen.

Table on the left shows you how it scrolls:

Note: When the meter is set to “2LL”, the rst

to the fourth screens will not be displayed.

Three phase

apparent pow er

Three phase PF

Syster m power &

power factor

Three phase

power

Three phase

r eac tive pow er

P

P

P

P

P

Syster m power &

fr equency

Syster m power demand

Syster m power

Pr edi c ting dem and

P

P

P

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DPMS XPQ User Manual

Press H, to display power quality data,

including THD, unbalance factor and voltage

eligibility. The screen will scroll to the next display

as you press H each time. It will go back to the

rst screen if you press H at the last screen.

The following table shows you how it scrolls:

Note 1: Some patterns do not have these

functions so the key function and display are

invalid.

Note 2: When the meter is set to “2LL”, THD,

unbalance factor and voltage eligibility are based

on the line-to-line voltage; otherwise they are

based on the phase voltage.

Press E to display energy and the real time clock. The screen will scroll to

the next display as you press E each time. It will go back to the rst screen if

you press E at the last screen.

The unit of power is kWh and kVARh for reactive power. The running

time begins to record at the time when the meter is turned on, with the

accuracy of 0.01H and is stored in the nonvolatile memory. It can be reset via

communication port.

The following table shows you how it scrolls:

Note: Patterns without TOU functions will not display the 9th~16th screens.

Unbalance factor

Voltage Eligibility

THD of phase or

li ne power

THD of l i ne cur rent

H

H

H

H

43

POWER INSTRUMENTS

Total ener gy

Net ener gy

The absor ption
reac tiv e ener gy

Consum ption ener gy

Generati on ener gy

E

E

E

E

E

The gener ation
reac tiv e ener gy

Total r eac tiv e ener gy

Net r eacti ve ener gy

E

E

E

Date .For mat:

mm:dd :yyyy

Absor ption reac tiv e

ener gy of valley ti m e

Absor ption reac tiv e

ener gy of peak t i me

Meter r unni ng ti me

Time. For mat :

hh: mm:ss.

E

E

E

E

Consum ption ener gy of

nor mal ti me

Consum ption ener gy of

valley time

E

E

Absor ption reac tiv e

ener gy of shar p ti me

E

Consum ption ener gy of

shar p ti m e

Consum ption ener gy of

peak ti me

E

E

Absor ption reac tiv e

ener gy of nor mal ti me

E

E

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DPMS XPQ User Manual

Statistics Display

Press the P and V/A keys simultaneously, the Max and Min value of

metering data will be displayed on the screen. The time stamp can be accessed

through the communication port. P is used to change the display between

MAX and MIN, V/A is used to scroll the screen. The screen will scroll to the

next display as you press V/A each time. It will go back to the rst screen if you

press V/A at the last screen. It will exit whenever you press P and V/A Keys

simultaneously.

The following shows you how it scrolls:

Note: Set to "2LL", there is no display of "Max value of phase voltage"

.

Max val ue of the line to

line v ol tage

Max val ue of cur rent

Max val ue of power

Max val ue of phase

vol tage

V/A

V/A

V/A

V/A

Max val ue of vol tage

harm oni cs

Max val ue of unbalance

factor

Max val ue of cur rent

demand

Max val ue of cur rent

harm oni cs

V/A

V/A

V/A

V/A

P

+

V/A

45

POWER INSTRUMENTS

Meter Parameter Setting

Under the metering data display mode, press the

H and V/A key simultaneously, to get into the meter

parameter setting mode. Most of the settings can be

done through the keys on the panel.

In the meter parameter setting mode, press H to move the cursor. Right

moves one digit each time. Press P for increasing and press E for decreasing.

Press V/A for acknowledgment and going to the next setting item page. Press H

and V/A page keys simultaneously to exit in any setting item page.

An access code is needed to access the parameter setting mode. Only the

person who knows the access code can do the parameter setting. The access

code is 4 digits decimal. It is from 0000 - 9999. The factory default is 0000. After

you key in the right access code, press V/A to go to the rst parameter setting

page, otherwise go back to the metering data display page.

The following table shows you how to set it:

Note

The secondary of the
PT can not be shorted,
otherwise it may cause
severe damage to the
instrument.

46

DPMS XPQ User Manual

01: It is any digit from 1 - 247.

02: 1200, 2400, 4800, 9600, 19200, 38400bps are

available.

03: Voltage input could be one of three modes, 3LN,

2LN and 2LL. (Refer to chapter 2)

04: could be one of the three modes, 3CT, 2CT and 1CT.

(Refer to chapter 2)

05: PT1 value is an integer from 50.0 - 500000.0, the

unit is volt.

06: PT2 value is an integer from 100 - 400. The unit is

volt. If there is no PT on the voltage input side of meter,

the PT1 and PT2 should be the same and equal to the

input rated voltage.

07: CT1 value is an integer from 5 - 50000 for a 5 Amp

rated current meter, and 1 - 50000 for a 1 Amp rated

current meter.

08: Output mode of DO can be set as alarm (AL) and

pulse (PLS).

09: It is an integer from 0 - 4 and stands for no output,

consumption energy, generation energy, absorption

03 : Voltage input wi r ing

04 : C urrent input wir ing

05 : PT primary

01 : Address setting

02 : Baud r ate setting

V/A

V/A

V/A

V/A

V/A

Access code page

V/A

P

+

06 : PT secondary

07 : CT primary

V/A

V/A

47

POWER INSTRUMENTS

reactive energy and generation of reactive energy

respectively.

10: The same as DO1 for setting, and they don’t affect

each other.

11: The DO pulse width is an integer from 1 - 50. One

digit is 20ms.

12: Pulse rate means the energy value per pulse. It

can be an integer of 1 - 6000. One digit is 0.1kWh or

0.1kVarh.

13: For the latching mode, the relay can be used to

output two states: on or off. For the momentary mode,

the output of the relay changes from off to on for a

period of time, Ton and than goes off. Ton can be set

from 50-300ms. (0: latching; 1: momentary).

14: When the relay mode is set to momentary, the

closing time, Ton is an integer from 50 - 3000ms.

15: The same as Relay1.

16: The same as Relay1 and they don’t affect each

other.

17: The “on” time can be set from 0 - 120 minutes. The

back light will always be “on” if the setting value is 0. If

it is another value, it means after a long time it goes off

if no key has been pressed. It will be “on” whenever you

10 : 09 : DO2 output item

11:The D O pul se w idth

12 : Energy pul se r ate

08: D O mode setting

09 : DO1 output i tem

V/A

V/A

V/A

V/A

V/A

13 : R elay 1 mode

14 : R elay 1 closing time

V/A

V/A

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DPMS XPQ User Manual

press any key if it is “off”.

18: 0 and 1 stands for current month and current day

respectively.

19: To clear the Max and Min value does not mean write

0 to all the registers, it will copy the metering value to the

statistic registers and start a new statistic period.

20: 1,2,3,4 stands for sliding window, fixed window,

rolling window and thermal respectively.

21: 1 - 60 minutes are available.

22: 1 - 60 minutes are available, but the demand period

must be divided exactly by the demand subinterval.

23: To clear demand memory means set “0” to all the

registers used in the demand calculation.

24: To clear the peak demand means just set “0” to the

peak demand registers and will not affect others.

25: “0” stands for no synchronous triggering, “1” for DI1

as the trigger, “2” for DI2 as the trigger, “3” for DI3 as the

trigger and “4” for DI4 as the trigger.

26: “1” stands for from OFF to ON; “2” stands for from

17 : Display back l i ght

“ on ” time

18 : M AX Statistic tim e

mode

19 : Clear ance of the

Max and M in value

15 : R elay 2 m ode

16 : R elay 2 closing tim e

V/A

V/A

V/A

V/A

V/A

20 : Dem and cal culation

mode

21 : Dem and period

V/A

V/A

22 : D emand subinter val

V/A

49

POWER INSTRUMENTS

ON to OFF; “3” stands for trigger at any change.

27, 28, and 29: To adjust polarity of the current, the three

currents direction can be set as “Negative” which means

reversing 180 degrees and “Positive” which means

normal.

30: “yes” means alarming is available and “no” means

not.

31: “yes” means the backlight ashes during alarming.

32: “yes” means the relay works in alarming mode and

“no” for remote controlling mode.

33: Th ere are 16 records in a ll an d each one is

corresponding to one bit of a 16-bit register. For each

record, it works or not depends on the enable setting.

If some bits of the register are “1”, it means their

corresponding records take effect. While “0” means they

don’t work. On the panel, it is set as decimal but in the

register it is binary, so it needs conversion.

34: When DO1 works in alarming mode, it is controlled

by a 16-bit register which determines which record will

output to DO1. On the panel, it is set as decimal but in

the register it is binary, so it needs conversion.

35: When DO2 works in alarming mode, it is controlled

by a 16-bit register which determines which record will

25 : D I synchr onization

tr i ggering dem and

26 : D I synchr onization

tr i ggering m ode

27: C urrent I 1 direction

23 : C lear ance of peak

demand

24 : C lear ance of peak

demand m emory

V/A

V/A

V/A

V/A

V/A

28: C urrent I 2 direction

29: C urrent I 3 direction

V/A

V/A

50

DPMS XPQ User Manual

output to DO2. On the panel, it is set as decimal but in

the register it is binary, so it needs conversion.

36, 37: The same as DO1 and DO2.

38: Two alarm rules can be logically “and” by controlling

the logic switch. When two alarm rules are logical and

the alarming works, only both of them are true. This

function is controlled by the low 8 bits of a 16-bit register;

each bit is corresponding to a group. “1” means this

function is turned on and “0” means off.

39: Any change on DI can trigger waveform capturing.

It is controlled by a 16-bit register. Bit1, bit0 controls

DI1, bit3, bit2 controls DI2, bit4, bit5 controls DI3 and

bit7, bit6 controls DI4. “00” stands for no capturing, “01”

capture from off to on, “10” from on to off and “11” for any

changes.

Note: You should convert the hex number to a binary

number rst.

40: Under the condition of a blank record, setting “yes”

can initialize one record of the waveform capture.

41: After every interval, it records the value of frequency,

UA (UAB), IA, UB (UBC), IB, UC (UCA), IC. The values

are called trending records. The interval can be set from

1min - 60min with a default of 60min.

42: Display format is MM: DD: YYYY.

43: display format is hh:mm:ss.

32 : R elay for alarm ing

33 : Alar ming r ecor ds

enable

34 : Al armi ng output to

DO1

30 : Al armi ng enable

31 : Backlight flashing

V/A

V/A

V/A

V/A

V/A

35 : Al armi ng output to

DO2

36 : Al armi ng output to

RO1

V/A

V/A

37 : Al armi ng output to

RO2

V/A

51

POWER INSTRUMENTS

44: This is the last screen of the setting page. The

access code can be changed on this page. It is important

to remember the new access code.

40 : M anual tr igger ing

waveform capture

41 : Intervals of tr ending

record

42 : system date setting

38 : Logi cal and

between al ar m r ules

39 : D I tr iggering
waveform mode

V/A

V/A

V/A

V/A

V/A

43 : system time setting

44 : Access code

V/A

V/A

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DPMS XPQ User Manual

Energy Parameter setting

Pressing H and E simultaneously under the metering data display mode will

enter the energy settings page. The key operation is the same as in other

setting pages. You need to press H and E simultaneously to exit this mode.

The following table shows you how to set it:

01: TOU can be forbidden in application.

02: TOU time setting is complex, the meter has a default

when it leaves the factory. You can use the default or set it

yourself.

03: Energy can be reset by writing registers one by one

or writing “0” to them all at one time. TOU and real time

energy can be reset respectively.

04:“nature” means balance at the end of a month, “assign”

means balance at an assigned time every month. TOU

balance means to end the accumulation of the energy in

the current balance month and begin to accumulate the

energy in a new balance month.

05: When “assign” is selected, the time is to be set here,

format is dd:hh:mm:ss.

06: Copy the real time energy and TOU energy of current

month to the freezing memory. There are two modes.

“Assign” means pointing a time to freeze, “at once” means

freezing right now. If you select the “assign” mode, you

need to set the time on the 8th screen skipping the 7th; if

you select the “at once” mode, you need to nish the 7th

screen in order to execute the order.

03 : Real ti m e energy

reset selection

04 : T OU bal ance m ode

sel ecti on

05 : TOU balance tim e

setti ng

01 : TOU ener gy enable

02 : TOU setting reset to

defaul t

V/A

V/A

V/A

V/A

V/A

Acces s c ode page

E

H

+

06 : Energy fr eezi ng

mode s el ecti on

V/A

53

POWER INSTRUMENTS

07: This screen will display only when you select the “at

once”.

08: Set your time of freezing on this screen when you

select the “assign” mode.

09: There are two modes of clearance: “assign” means

clear at an assigned time, this will skip the 10th screen

to the 11th to set the time. “At once” means clear at once

after you nish the 10th screen.

10: Finish this screen when you select the “at once”

mode.

11: Execute this order every year at this date:MM:DD.

12: Execute this order every year at this time:hh:mm:ss.

13: “0”stands for fundamental based measuring, “1”

stands for all-wave based measuring.

14: “0” stands for mode 0:

“1” stands for mode 1: .

09 : TOU clear ance

mode selecti on

10: TOU clear ing at

once setti ng

11 : TOU clear ance date

setting

07 : Fr eezing at once

setting

08 : Freezing tim e

setting

V/A

V/A

V/A

V/A

V/A

12 : TOU clear ance tim e

setting

V/A

13 : Ener gy measuring

mode selecti on

14 : Apparent power

measuring mode

V/A

54

DPMS XPQ User Manual

Voltage Eligibility Parameter Setting

Pressing H and P simultaneously under the metering data display mode

will enter the voltage eligibility statistics setting page. The operation of keys is

the same as in other setting pages. You need to press H and P simultaneously

to exit this mode.

Whether the voltage is eligible or not is according to whether the measured

voltage is within the limitations set by the user. The limitations of the three

phase voltages can be set respectively and the setting value is the same as the

communication value, which is the secondary value without PT and CT.

The following table shows you how to set it:

01, 02: When the meter is set to “2LL”, it is U12 and

U1 for others.

01: High limit of

U1(U12 )

02 : Low lim it of

U1(U12 )

V/A

V/A

Access code page

P

H

+

55

POWER INSTRUMENTS

03, 04: when the meter is set to “2LL”, it is U23 and

U2 for others.

05, 06: when the meter is set to “2LL”, it is U31 and

U3 for others.

07: There are two modes of clearance: “assign”

means clear at an assigned time, this will skip the 8th

screen to the 9th to set the time. “At once” means

clear at once after you nish the 8th screen. After the

clearance, all time values will be 0 and voltage

eligibility will be 100%.

08: Finish this page when you select the “at once”

mode.

05 : High limit of

U3 (U31 )

06: Low limit of

U3 (U31 )

07 : Voltage Eligibility

cl earance mode

03 : High limit of

U2 (U23 )

04: Low limit of

U2 (U23 )

V/A

V/A

V/A

V/A

V/A

08 : Voltage Eligibility

cl ear at once setti ng

V/A

56

DPMS XPQ User Manual

09, 10: Set the time for the “assign” mode

.

11: It only freezes real time measurement. There are

two modes. “Assign” means pointing a time to freeze,

“at once” means freezing right now. If you select the

“assign” mode, you need to set the time on the 13th

screen skipping the 12th; If you select the “at once’

mode, you need to finish the 12th screen in order to

execute the order.

12: if you select the “At once” mode at the “Voltage

Eligibility freezing mode setting”, you can go into this

page to execute the order at once.

13, 14: The meter will freeze the data at this

moment according to its inner clock.

11 : Voltage Eligibility
fr eezing mode setting

12 : Fr eezing at once

setting

13 : Fr eezing date

setting

09 : Voltage Eligibility

cl earing date setti ng

10 : Voltage Eligibility

cl earing ti me setting

V/A

V/A

V/A

V/A

V/A

14 : Freezing tim e

setting

V/A

Chapter 4 Function and Software

Functionality and Utility Software

57

58

DPMS XPQ User Manual

The DPMS XPQ can measure almost all the parameters in the power

system. Some of its functions may not be demonstrated by simply pressing the

keys, hence, the software to go with it. We’ll introduce functions with the help of

the software interface in this chapter. The version of the software you buy may

be advanced and it may differ somewhere, please refer to the manual that goes

with it.

Basic Analog Measurements

It can measure voltage, current, power, frequency etc with high accuracy,

shown as below:

Fig 4.1 Real-Time Metering

59

POWER INSTRUMENTS

Note1: It should be clear that there is a dened correspondence between

the real value and communication value. For more detail, please refer to chapter

5.

Note 2: Settings related to measurements are in system settings.

Harmonics

It can measure and analyze THD, Harmonics (2nd to 31st), even HD, odd

HD, Crest Factor, THFF, K factor etc. Values excluding harmonic ratios are

shown in the gure below:

Fig 4.2 Total Harmonic Distortion

60

DPMS XPQ User Manual

A chart in the software is shown below:

Fig 4.3 Voltage Spectrum

Phase angle

Phase angle indicates the angle between U1 and other voltage and current

parameters. It ranges from 0 - 360 degrees. This function is to help you nd out

the relationship between all input signals avoiding incorrect wiring. When it is

set to “2LL”, it gives the phase angle of u23, i1, i2, i3 corresponding to u12 and

u2, u3, i1, i2, i3 corresponding to u1 for other settings.

The following gure is an example:

61

POWER INSTRUMENTS

Fig 4.4 Phase Angles

Current direction adjustment

The right current direction is from port 1 to port 2. To adjust polarity of

current, the three currents direction can be set as “Negative” which means

reversing 180 degrees and “Positive” which means normal.

Sequence component and unbalance analysis

The DPMS XPQ will do some sequential analysis for the input signal. it

makes out the positive sequence, negative sequence and zero sequence of the

fundamentals and will do the unbalance analysis of voltage and current.

The following gure shows a sequence chart:

62

DPMS XPQ User Manual

Fig 4.5 Sequence Component

Max/Min

The meter can record statistics of the maximum and minimum values of

phase/line voltages, currents, power, reactive power, apparent power, power

factor, frequency, demand, unbalance factor, THD as well as the time they

occur. The statistic period can be set as “month” or “day”. All the data will be

stored in nonvolatile memory so that they will not be lost when the power is off.

All the data can be accessed via communication port and be cleared by panel

keys.

63

POWER INSTRUMENTS

The following gure is an example:

Fig 4.6 Max and Min

Demand

Types of demands calculated are: consumption power demand of phases

A, B, and C, generation power demand of phases A, B, and C, absorption

reactive power demand of phases A, B, and C, generation reactive power

demand of phases A, B, and C, consumption power demand of three phase,

generation power demand of three phase, absorption reactive power demand

of three phase, generation reactive power demand of three phase, apparent

64

DPMS XPQ User Manual

power demand, current demand of I1, current demand of I2, current demand of

I3, current demand of average current, consumption power predictive demand,

generation power predictive demand, absorption reactive power predictive

demand, generation reactive power predictive demand, and apparent power

predictive demand.

The values calculated include last period values, current period values,

peak demands and their occurring time. Current period values are the

calculation values of demand in the current period, while last period values refer

to the values achieved for the last completed period. Peak demands are the

maximum demands since cleared last time. Time stamp will be stored when the

update of the calculation occurs.

Peak demand and demand memory can be cleared. To clear is to reset all

the registers to 0, like the initial state of the meter (demand calculation only).

Demand calculating mode can be set as a sliding window, xed window,

rolling window or thermal demand according to the user.

In the sliding window interval, you select an interval from 1 - 60 minutes,

which is the period of the calculation. The demand updates every minute.

In xed window interval, select the period of the calculation as mentioned

above. The meter calculates and updates the demand at the end of each period.

In rolling window interval, you select an interval and a subinterval. The

subinterval should divide exactly by the interval. Demands update at the end of

each subinterval.

Thermal demand method calculates the demand based on a thermal

response which mimics the thermal demand meter. You select the period for the

65

POWER INSTRUMENTS

calculation and the demands update at the end of each period.

Synchronization demand

When it is set as a xed window, rolling window or thermal demand, the

period can be synchronized via communication port or by changes of DI.

DI Synchronization demand

Changes to DI can trigger the synchronization of the demand period. The

set is as follows.

1. Select a method from xed window, rolling window or thermal demand.

2. Select a DI port (address is 1040H) as the trigger, the values are 0~4

corresponding to none and D1~D4.

3. Select the trigger mode of DI (address is 1041H), the values are 1~3

corresponding to from OFF to ON, from ON to OFF, triggering at any

change.

Command Synchronization demand

Using a broadcast command to synchronize the demand, calculation can

be set as follows:

1. Select a method from xed window, rolling window or thermal demand.

2. Broadcast command: the addresses of all the meters are considered 0.

Write ff00H to address 8000H using the 10H command. But the receiver

may not answer.

Note: All operations can only be finished via communication. Using key

functions can only partially nish them.

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Here is an example:

Fig 4.7 Demand

Here is to set demand:

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Fig 4.8 Demand Setting

Energy

Various kinds of energy will be accumulated. The settings are explained in

other chapters, so please refer to chapter 3 and chapter 5 carefully.

Real time energy: the accumulation of energy for the kWh, kVARh and

kVAh since cleared last time.

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Fig 4.9 Real-Time Energy

TOU

You can point some different time block to go with different rates (sharp,

peak, valley and normal). The meter will calculate the fee according to its inner

clock and the settings. So it charges different fees for different rates.

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The following is an example:

Fig 4.10 Current Month TOU

Calculating mode

1. You can select calculating mode from a fundamental base or all-wave

base by pressing a key or via communication. Fundamental based calculating is

to accumulate energy ignoring harmonics while all-wave based calculating is to

accumulate energy including fundamental and harmonics.

2. There are two ways to calculate apparent energy(power):

Mode 0:

Q

P

S

2

2

+=

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Mode 1:

The following gure shows how to set it:

Fig 4.11 Energy Setting

Freezing

This is to backup the accumulated TOU, current TOU, and real time energy

at some time point without affecting the existing data.

You can use the freeze data for the statistic applications, with all the values

recorded at the same time, enhance the accuracy and efciency. Freezing can

be set automatically or manually making the application very exible.

Here is an example:

D

Q

P

S

2

2

2

++=

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Fig 4.12 Cumulative TOU

TOU calendar:

There are four schedules and each schedule has 8 time intervals. Each

interval can charge one of the four rates: sharp, peak, valley and normal.

Time format for each schedule is: enable | start time mm:dd:hh:mm:ss | end

time mm:dd:hh:mm:ss

Time format for each interval is: enable | start time hh:mm:ss | end time hh:

mm:ss | rate kind

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You can adjust the calendar to satisfy different uses. To ensure the validity

of the calendar setting, the meter will check its rationality strictly. If there is no

mistake in the calendar and the TOU function is enabled, TOU accumulation will

begin.

Requirement of the time format:

1. Schedules must be selected in turn. For example, if you use two

schedules, you should enable the rst and then the second.

2. The sum of all schedules must be one year. For example, if you only

use schedules, the rst is from January 1st 03:03:03 to July 6th 02:02:02, the

second period must be from July 6th 02:02:02 to January 1st 03:03:03.

3. Start time of the next schedule must be the end time of the last schedule.

4. Schedules in use must be at least 1 and at most 4.

5. The record in use must be at least 1 and most 8 used in turn. If you use

3 intervals, you should use the 1st, 2nd and 3rd.

6. The sum of all time intervals in a schedule must be one day. For

example, 3 intervals are enabled, if the rst interval is from 03:03:03 to 12:02:02,

the second interval is from 12:02:02 to 02:03:03, then the third interval must be

from 02:03:03 to 03:03:03.

7. The next start time equals the last end time.

8. Many intervals can share the same rate.

Note: You can order special factory settings, the product has default settings.

You can reset the meter to default via communication or by key functions.

Here is an example:

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Fig 4.13 TOU Schedules Setting

Pulse Energy Output

The two digital outputs can be used as energy pulse output and cannot

be used as the alarming outputs at the same time. The output energy can be

selected among all kinds of energy and reactive energy. Pulse constant and

pulse width can be set to meet your requirements. Pulse constant is the kWh

a pulse stands for, pulse width is the pulse duration. When the accumulated

energy reaches the pulse constant, there will be a pulse on DO.

Related parameters: pulse energy output ranges from 0 to 4 corresponding

to none, Ep_imp, Ep_exp, Eq_imp, Eq_exp.

Pulse constant ranges from 1 - 6000 (integer) with a unit of 0.1kWh (kVARh),

apparently that is the resolving power of energy output.

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Pulse width ranges from 1 - 50 (integer) with a unit of 20ms. The narrowest

interval between two pulses is 20ms.

In practice the pulse width and the pulse ratio are selected according to

system power. The relation of the two parameters should be satisfied by the

following expression,

In the expression, the Pmax is the maximum power or reactive power. The

unit is kW or kVAR. Recommend pulse ratio is 3 to 5 times the right side value

of the above expression.

The related settings are:

Fig 4.14 Digital I/O Setting

18000000

Pmax) 1 width pulse (

radio Pulse

×+

>

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POWER INSTRUMENTS

Event alarming

When the metering data is over the pre-setting limit and over pre-setting

time interval, the over limit alarming will be picked up. The over limit value and

time will be recorded and the maximum number of records is 16. The digital

output (DO) and RO1, RO2 can be used as a trigger to light or sound alarming.

Alarming can also trigger waveform capturing.

Application and settings of event alarming:

In order to use the event alarming function, you should finish all the

settings (equation or in equation or enable switches) correctly, or it will fail. All

the settings are to write their corresponding registers via communication.

1. Alarming setting

Table 4-1 indicates a group of settings, there are 16 groups in all with the

same format. Parameter is the main body. There are 247 parameters in all as

shown in table 4-2.

We use the serial number instead of its parameter to nish the settings, the

serial number will be stored in the rst storage unit of every group.

What is most important is parameter, so we can calculate some equations

or in equations to get the goal. For example, if we want one event of frequency

equaling to 50 Hz, we set: serial number: 0; comparison mode: 2; setting value:

5000.

Special attention: “setting value” corresponds to main parameter, the

relationship between its value and real physical value is the same as the main

parameter.

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“Delay time” indicates the time period that the event keeps happening after

the setting equation or in equation is satisfied, which is used to confirm the

event. Its value ranges from 0 - 6000 (integer) with a unit of 10ms. There is no

delay when it is set to be 0, so the event triggers alarming at once. For example,

if it is set to be 20, delay is 20*10=200ms. “Waveform triggering” refers to

whether waveform capture works when the set event occurs.

address parameter range

14F0H First group: serial number 0~246
14F1H First group: comparison mode 1:more,2:equal,3:less
14F2H First group: setting value Related with parameters
14F3H First group: delay time 0~6000(*10ms)
14F4H First group: waveform capture 1:capture; 0:not capture

Table 4-1 rst group of alarming settings

Serial number parameter

0~32 33 basic analog measurements parameters from“Frequency” to

“Loadcharacteristic” discussed in chapter 5.

33~241 209 parameters from “THD_V1” to “K Factor of I3” discussed in chapter 5.

242 Consumption energy predict demand
243 Generation energy predict demand
244 Consumption reactive energy predict demand
245 Generation reactive energy predict demand
246 Apparent energy predict demand

Table 4-2 parameters for alarming

Thus far, the equations or in equations are nished, but the setting are not

nished yet, we have to go through the following steps to nish them.

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POWER INSTRUMENTS

2. Global settings

The addresses of all global variables are 101dH~1024H and 103dH in

system parameters discussed in chapter 5. “Alarming enable” determines

whether the alarming function of this meter works. Only when it is set as “1”,

the alarming function enables. When “Alarming ash enable“ is set to “1”, the

backlight will ash when an alarm happens.

“Alarming records enable setting” determines whether it records. There are

16 records in all and each one corresponds to one bit of a 16-bit register. For

each record, it works or not depending on the enable setting. If some bits of the

register are “1”, it means their corresponding records take effect.

“Relay for alarming setting”: There are two relays. They can be used as

remote controlling output and alarming output. But one can’t work in two modes

at the same time. “1” means the relay works in alarming mode and “0” for

remote controlling mode. This setting is valid for both relays.

“Alarming output to RO1 setting”: when “Relay for alarming setting” is set

to be “1”, the relay is available for alarming, but which record it will be driven by

and whether output to RO1 or RO2 will depend on other settings. This setting

will give an answer. There are 16 records in all and each one corresponds to

one bit of a 16-bit register, when the corresponding bit is set to “1”, the relay

will close if the alarming condition is satised. It opens only when all the alarms

related to RO1 recover. If the corresponding bit is set to “0”, RO1 will not be

disturbed.

Note: When the relay is used in alarming mode, it works in latching mode. There

is no pulse mode. So all setting of the relay's working mode will be ignored.

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“Alarming output to RO2” decides which alarm will be output to RO2. It is

set the same as RO1.

“Alarming output to DO1 setting”: When “Digital output mode” is set to “1”,

DO1 can be used as an alarming output. Which alarm will be output to RO2 is

set here. You need to do the same as what you do in setting RO1.

“Alarming output to DO2 setting”: The same as “Alarming output to DO1

setting”.

“Logical and between alarming setting”: The 16 alarming records are

divided into 8 groups. Each group has two records. The two alarms can be

logically “and” by controlling the logic switch. When two alarms are logically “and”,

the alarming works only when both are satisfied. If the switch is off, the two

alarms work independently.

The 8 groups are arranged as follows: according to their serial number, the

1st & 2nd make the 1st group as group A; the 3rd & 4th make the 2nd group as

group B; The 5th & 6th make the 3rd group as group C; 7th & 8th make the 4th

group as group D; 9rd &10th make the 5th group as group E; 11th & 12th make

the 6th group as group F; 13th & 14th make the 7th group as group G; 15th &

16th make the 8th group as group H.

This function is controlled by the low 8 bits of a 16 bits register, each bit

corresponds to a group. “1” means this function is turned on and “0” means off.

After finishing the previous settings, the alarming function is turned on.

We’ll show you an example of how to use the logical “and” in a group.

We set an event as follow: I1 greater than 180A, delay 5s for the 1st record;

U1 less than 9980V, delay 10s for the 2nd record. No waveform triggering,

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POWER INSTRUMENTS

no output. The CT primary value of I1 is 200A. The primary voltage of U1 is

10000V, PT2 is 100V. Then let’s look how all the related registers are set.

The rst record:

According to the table, the serial number of I1 is 9 ((14d8H)= 9); Conditions

in equation 1 determine the high limit. So “comparison mode” (14d9H) = 1(>).

CT1 is 200A, according to the relationship between the communication value

and numerical value. I=Rx X(CT1/5)/1000, so I1 is 180A. Then the limit is (14daH)

= 4500; Delay 5s, as the unit of Limit_t register is 10ms, so the delay time is

(14dbH) = 500; Alarming but no waveform triggering, “waveform capture” (14dcH)

= 0.

The second record:

According to the table, the serial number of U1 is 1 ((14ddH) = 1);

Conditions in equation 1 determine the low limit. So “comparison mode” (14d9H)

= 3(<); PT1 is 10000V, according to the relationship between the communication

value and numerical value, U=Rx X (PT1 / PT2) /10, so the register value should

be 998; Delay 10s, as the unit of Limit_t register is 10ms, so the delay time is

(14e0H) = 1000; Alarming but no waveform triggering, so “waveform capture”

(14e1H) = 0.

Settings between the two records:

“Alarming output” of the 1st, 2nd(101fH) = 0x0003; No hardware output,

(1020H)=0; (1021H)=0;(1022H)=0; (1023H)=0; logical and(1024H)=0x0001; At

last, the” alarming enable”, (101dH) =1.

Here is a gture showing the alarming settings:

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Fig 4.15 Alarm Setting

Event alarming setting

There are 16 of records to be stored. But they are not corresponding to

setting records, they record in cycle. The latest event will cover the oldest one.

It begins from the 1st record when the power is turned on. When over range

parameters resume to normal, the time and value will be recorded as an event

as well. So you can work out the continuous time of over range by checking the

changing time.

Here is the 1st record. Other records have the same format.

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address parameter range

1540H First group: alarming status 0~65536
1541H First group: parameter number 0~246
1542H First group: over range or reset value Related with parameters
1543H~1549H First group: occur time: yyyy mm:dd:hh:

mm:ss:ms

time

Table 4-3 alarming status of the 1st record

“alarming status” indicates information of the current status. It is a 16-bit

unsigned integer. Serial number is stored in the high 8 bits. Bit1 indicates logical

and.

Bit1=1,yes; Bit1=0,no. Bit0 indicates alarming is to setup or to recover.

Bit0=1, setup; Bit0=0, recover. Undened bits are 0.

“Serial number” indicates which parameter is recorded.

“Value” indicates alarming limit value.

“Time” indicates the time with accuracy of ms.

Alarming event will set bit2 of “system status” to 1. At the same time,

corresponding ags will be set to 1 to indicate new data. It should be cleared

after the controller has read the data, then bit2 of the system parameter will be

set to 0.

Note: alarming records will not be lost during power off. The pointer will

point to the 1st record after it is powered on again.

Here is an example:

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Fig 4.16 Alarm Log

SOE Function

There are 4 DI inputs, it can record changing information of DIs. The time

resolution is 1ms. It can also determine whether to enable waveform capture

and which kind of triggering by setting “DI triggering waveform capture mode” in

system parameters. Its register forms a 16-bit unsigned integer. Bit1,bit0=DI1;

Bit3,bit2=DI2;Bit5,bit4=DI3; Bit7,bit6=DI4. “00” stands for none, “01” stands for

from OFF to ON, “10” stands for from ON to OFF ,“11” stands for trigger at any

change.

Format: DI status | occur time yyyy |mm | dd | hh | mm | ss | ms

There are 20 groups of records, it will begin with the rst one after power

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POWER INSTRUMENTS

on and it works in a cycle. The data won’t lose during power off SOE will set bit0

of “system status” to be 1. At the same time, corresponding ags will be set to 1

to indicate new data. The meter sets ag of SOE but does not clear it. It should

be cleared after controller has read the data, then bit0 of system parameters will

be set to 0.

Here is an example:

Fig 4.17 SOE Log

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Waveform record

The DPMS XPQ can record 5 cycles of waveforms both before and after

the trigger point of the entire 6 input channels (U1, U2, U3, I1, I2 and I3). There

are 16 points for each cycle and a maximum of 5 waveform records.

There are three reasons for waveform triggering: DI changes, alarming and

manual triggering. Please refer to related chapters for more details.

Format: w1~w7 recording time (w1:yyyy; w2:mm; w3:dd; w4:hh; w5:mm;

w6:ss; w7:ms).

w8-w10 indicates the trigger: (w8: DI triggering, Bit1,bit0 indicates DI1;

Bit3,bit2 indicates DI2; Bit5,bit4 indicates DI3 and Bit7,bit6 indicates DI4. “00”

indicates not trigger by DI, “01” indicates trigger by DI from off to on, “10”

indicates trigger by DI from on to off and “11” indicates a trigger by DI for any

changes. w9: alarming trigger, bit0~bit15 are corresponding to the 1st - 16th of

the 16 alarming groups. 1: alarming trigger capture; 0: alarming does not trigger

capture. w10: manual triggering.1:yes; 0:no.)

Then there are 10 cycle waveform of UA, 10 cycle waveform of IA, 10 cycle

waveform of UB, 10 cycle waveform of IB, 10 cycle waveform of UC, 10 cycle

waveform of IC. Please refer to the address table for more details.

The waveform record will set bit1 of “system status” to 1. At the same time,

corresponding flags will be set to 1 to indicate new data. The meter sets the

ag of the waveform record but does not clear it. It should be cleared after the

controller has read the data, then bit0 of system parameters will be set to 0.

Update rule: It checks out empty records from the rst one, if there is no

blank record, it won’t take a new record. All records won’t be lost during power

off.

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POWER INSTRUMENTS

Here is an example:

Fig 4.18 Waveform Log

Trending records

The DPMS XPQ-G takes records of frequency, UA (or UAB), IA, UB (or

UBC), IB, UC(or UCA), IC at a xed interval. So the controller can draw trending

charts easily.

The time interval can be 1~60 minutes, with the default of 60.

It can take 336 records in all and recurs after it is full. It takes the occurring

time of the latest record and there are no time stamps for other records. “Trending

record pointer” indicates the serial number of the next record. This pointer can

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not be changed. “Trending record backup pointer” is used by the controller,

it stores the serial number that the controller will read, it can not be changed

by the meter either. It is used to compare “trending record pointer” with input

data from the controller, when the two are equal, bit4 of “system status” will be

cleared ensuring all data has been read by the controller.

Bit4 of “system status” will be set to 1 when there is a new record.

Trending records will not be lost during power off. “Trending record pointer”,

“trending record backup pointer” and Bit4 of “system status” will be set to 0 after

power on.

Here is an example:

Fig 4.19 Trending Log

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POWER INSTRUMENTS

Voltage Eligibility

The DPMS XPQ-G can take the statistics of voltage eligibility, then give out

a great amount of data.

Eligibility = (1-overlimit time/Measuring time)*100%

The upper and lower limits of voltage can be set according to the user.

When voltage is out of range, it is not eligible. Three limitations of voltages of

the phase or line can be set respectively. The format of the setting value and

communication value is the same. They are all set according to input voltages.

For example, if the PT used is a 10000/100 PT, the high limit of voltage is set as

10300V, then the setting value is 10300÷(10000/100)=103V. Then according to

the relationship between the communication value and numerical value , U=Rx

X (PT1 / PT2) /10, so the value to be written, Rx is 103*10=1030. Setting by

pressing keys should use the same value.

Voltage eligibility consists of running time, channel eligibility and eligible

time. In order to find and analyze, it is divided into real time, statistics, and

freezing zone. Please refer to the address table for more details. The format of

eligibility is 99.9999999%.

Voltage eligibility can be frozen and cleared.

Here is an example:

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Fig 4.20 Voltage Eligibility Ratio

Chapter 5 Communication

Introducing Modbus Protocol

Format of Communication

Data Address Table

Application Details

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This ch apter m ain ly disc uss es how to h andle t he mete r vi a the

communication port using software. To master this chapter, you should be

familiar with Modbus and have read the other chapters in this manual. Once you

have completed these steps you will have mastered the function and application

of this product.

This chapter includes: Modbus protocol, the format of communication and

data address tables and application details.

Introducing Modbus Protocol

The Modbus RTU protocol is used for communication in the DPMS XPQ.

The data format and error check methods are dened in the Modbus protocol.

The half duplex query and respond mode is adopted in the Modbus protocol.

There is only one master device in the communication net. The others are slave

devices, waiting for the query of the master.

Transmission mode

The mode of transmission defines the data structure within a frame and

the rules used to transmit data. The mode is dened in the following which is

compatible with Modbus RTU Mode*.

Coding System 8-bit binary
Start bit 1
Data bits 8
Parity no parity
Stop bit 1
Error checking CRC check

* Modbus is trademark of Modicon, Inc.

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POWER INSTRUMENTS

Framing

Address Function Data Check
8-Bits 8-Bits N×8-Bits 16-Bits

Table5.1 Data Frame Format

Address Field

The address field of a message frame contains eight bits. Valid slave

device addresses are 0~247 decimal. A master addresses a slave by placing

the slave address in the address eld of the message. When the slave sends

its response, it places its own address in this address eld of the response to let

the master know which slave is responding.

Function Field

The function code eld of a message frame contains eight bits. Valid codes

are 1~255 decimal. When a message is sent from a master to a slave device

the function code eld tells the slave what kind of action to perform.

Code Meaning Action

01 Read Relay Output Status Obtain current status of Relay Output
02 Read Digital Input(DI) Status Obtain current status of Digital Input
03 Read Data Obtain current binary value in one or more registers
05 Control Relay Output Force Relay to a state of on or off
16 Press Multiple-Register Place specic binary values into a series

of consecutive Multiple-Registers

Table5.2 Function Code

Data Field

The data field is constructed using sets of two hexadecimal digits, from

00 to FF hexadecimal. The data eld of messages sent from a master to slave

devices contains additional information which the slave must use to take the

action defined by the function code. This can include items like discrete and

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DPMS XPQ User Manual

register addresses, the quantity of items to be handled, and the count of actual

data bytes in the eld. For example, if the master requests a slave to read a

group of holding registers (function code 03), the data eld species the starting

register and how many registers are to be read. If the master writes to a group

of registers in the slave (function code 10 hexadecimal), the data eld species

the starting register, how many registers to write, the count of data bytes to

follow in the data eld, and the data to be written into the registers.

If no error occurs, the data field of a response from a slave to a master

contains the data requested. If an error occurs, the eld contains an exception

code that the master application can use to determine the next action to be

taken. The data field can be nonexistent (of zero length) in certain kinds of

messages.

Error Check Field

Messages include an error checking field that is based on a Cyclical

Redundancy Check (CRC) method. The CRC eld checks the contents of the

entire message. It is applied regardless of any parity check method used for the

individual characters of the message. The CRC field is two bytes, containing

a 16 bit binary value. The CRC value is calculated by the transmitting device,

which appends the CRC to the message.

The receiving device recalculates a CRC during receipt of the message,

and compares the calculated value to the actual value it received in the CRC

field. If the two values are not equal, an error will result. The CRC is started

by 66 first preloading a 16-bit register to all 1’s. Then a process begins of

applying successive 8-bit bytes of the message to the current contents of the

register. Only the eight bits of data in each character are used for generating

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POWER INSTRUMENTS

the CRC. Start and stop bits, and the parity bit, do not apply to the CRC. During

generation of the CRC, each 8-bit character is exclusive ORed with the register

contents. Then the result is shifted in the direction of the least significant bit

(LSB), with a zero lled into the most signicant bit (MSB) position. The LSB is

extracted and examined. If the LSB was a 1, the register is then exclusive ORed

with a preset, xed value. If the LSB was a 0, no exclusive OR takes place. This

process is repeated until eight shifts have been performed. After the last (eighth)

shift, the next 8-bit byte is exclusive ORed with the register current value, and

the process repeats for eight more shifts as described above. The nal contents

of the register, after all the bytes of the message have been applied, is the

CRC value. When the CRC is appended to the message, the low-order byte is

appended rst, followed by the high-order byte.

Format of communication

Explanation of frame

Addr Fun Data start

reg hi

Data start
reg lo

Data #of
regs hi

Data #of
regs lo

CRC 16HiCRC 16

Lo

06H 03H 00H 00H 00H 21H 84H 65H

Table 5.3 Explanation of frame

In table 5.3, the meaning of each abbreviated word is,

Addr: address of slave device

Fun: function code

Data start reg hi: start register address high byte

Data start reg lo: start register address low byte

Data #of reg hi: number of register high byte

Data #of reg lo: number of register low byte

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DPMS XPQ User Manual

CRC16 Hi: CRC high byte

CRC16 Lo: CRC low byte

1. Read Status of Relay (Function Code 01)

This function code is used to read status.

1=On, 0=Off;

There are 2 Relays. The Address of each Relay is Relay1=0000H and

Relay2=0001H.

The following query is to read Relay Status of meter number 17.

Query

Addr Fun relay start

reg hi

relay start
reg lo

relay #of
regs hi

relay #of
regs lo

CRC 16HiCRC 16

Lo

11H 01H 00H 00H 00H 02H BFH 5BH

Table 5.4 Read the status of Relay1 and Relay2 Query Message

Response

The DPMS XPQ response includes the meter's address, function code,

quantity of data byte, the data, and error checking. An example response to read

the status of Relay1 and Relay2 is shown in Table 4.5. The status of Relay1 and

Relay2 is responding to the last 2 bits of the data.

Relay1: bit0; Relay2: bit1

Address Function code Byte count Data CRC high CRC low

11H 01H 01H 02H D4H 89H

Table 5.5 Relay status responds

The content of the data is:

7 6 5 4 3 2 1 0
0 0 0 0 0 0 1 0

MSB LSB

Relay1 = OFF (LSB ), Relay2=ON (Left to LSB )

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POWER INSTRUMENTS

2. Read the Status of DI (Function Code 02)

1=On, 0=Off.

There are 4 DIs. The Address of each DI is DI1=0000H, DI2=0001H,

DI3=0002H and DI4=0003H.

The following query is to read the 4 DI Status of Number 17 DPMS XPQ.

Query

Addr Fun DI start

addr hi

DI start
addr lo

DI num
hi

DI num
lo

CRC 16
Hi

CRC 16
Lo

11H 02H 00H 00H 00H 04H 7BH 59H

Table 5.6 Read 4 DIs Query Message

Response

The meter response includes its address, function code, quantity of data

characters, the data characters, and error checking. An example response to

read the status of 4 DIs is shown as Table 5.7. The status of each is responding

to the last 4 bit of the data.

DI1: bit0 DI2: bit1 DI3: bit2 DI4: bit3

Address Function code Byte count Data CRC high CRC low
11H 02H 01H 03H E5H 49H

Table 5.7 Read Status of DI

The content of the data is,

7 6 5 4 3 2 1 0
0 0 0 0 0 0 1 1

MSB LSB

DI1=On, DI2=On, DI3=Off, DI4=Off

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3. Read Data (Function Code 03)

Query

This function allows the master to obtain the measurement results of the

meter.Table 5.8 is an example to read the 3 measured data (F, V1 and V2) from

slave device number 17, the data address of F is 0130H, V1 is 0131H and V2 is

0132H.

Addr Fun Data start

addr hi

Data start
addr lo

Data #of
regs hi

Data #of
regs lo

CRC 16
regs Hi

CRC 16
regs Lo

11H 03H 01H 30H 00H 03H 06H A8H

Table 5.8 Read F, V1, V2 Query Message

Response

The meter's response includes its address, function code, quantity of data

byte, data, and error checking. An example response to read F, V1 and V2

(F=1388H (50.00Hz), V1=03E7H (99.9V), V2=03E9H (100.1V) is shown in Table

4.9.

Addr Fun Byte

count

Data1hiData1LoData2hiData2LoData3hiData3LoCRC16hiCRC16

lo

11H 03H 06H 13H 88H 03H E7H 03H E9H 7FH 04H

Table 5.9 Read F, V1 and V2 Message

4. Control Relay (Function Code 05)

Query

This message forces a single Relay either on or off. Any Relay that exists

within the meter can be forced to be either status (on or off). The address of

Relays starts at 0000H (Relay1=0000H, Relay2=0001H). The data value FF00H

will set the relay on and the value 0000H will turn it off; all other values are

illegal and will not affect that relay.

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POWER INSTRUMENTS

The example below is a request to meter number 17 to turn on Relay1.

Addr Fun DO addr

hi

DO addr
lo

Value
hi

Value
lo

CRC 16
Hi

CRC 16
Lo

11H 05H 00H 00H FFH 00H 8EH AAH

Table5.10 Control Relay Query Message

Response

The normal response to the command request is to retransmit the message

as received after the relay status has been altered.

Addr Fun Relay addr

hi

Relay addr
lo

Value
hi

Value
lo

CRC
Hi

CRC
Lo

11H 05H 00H 00H FFH 00H 8EH AAH

Table5.11 Control Relay Response Message

5. Preset / Reset Multi-Register (Function Code 16)

Query

Function 16 allows the user to modify the contents of a Multi-Register.

Any Register that exists within the meter can have its contents changed by

this message. The example below is a request to number 17 to Preset Ep_

imp=(17807783.3KWH), while its Hex Value 0A9D4089H. Ep_imp data address

is 0156H and 0157H.

Addr Fun Data start

register hi

Data start
register lo

Data
register hi

Data
register lo

Byte
count

Value
high

Value loValue hiValue loCRC hiCRC

lo

11H 10H 01H 56H 00H 02H 04H 0AH 9DH 40H 89H 4DH B9H

Table5.12 Preset KWH Query Message

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DPMS XPQ User Manual

Response

The normal response to a preset Multi-Register request includes the

meter's address, function code, data start register, the number of registers, and

error checking.

Addr fun Data start

addr hi

Data start

addr lo

Data

register hi

Data

register lo

CRC

high

CRC

low

11H 10H 01H 56H 00H 02H A2H B4H

Table5.13 Preset Multi-Registers Response Message

Data Address Table and Application Details

There are several rules to follow in using the meter:

1. Data type:

“bit” refers to binary

“word” refers to 16-bit unsigned integer using one data address and 2 bytes

of memory, it varies from 0 - 65535.

“int” refers to 16-bit integer using one data address and 2 bytes of memory,

it varies from -32768 - 32767.

“dword” refers to 32-bit unsigned integer using two data addresses and 4

bytes of memory with high word at the front and low word at the end, it varies

from 0 - 4294967295.Rx=high word *65536+low word.

“oat” refers to 32-bit single value using two data addresses and 4 bytes of

memory, it varies from -1.175494E-38 - 3.402823E+38.

2. Relationship between communication value and numerical value.

The numerical value may not be the communication value, it is important to

notice this. The following table shows how they correspond to each other.