Heyuan Intelligence DZ81-MSU7C User manual

DZ81-MSU7C
Three Phase Voltmeter
User Manual
Heyuan Intelligence Technology Co., Ltd

IMPORTANT DECLARATIONS
Copyright © 2018 Heyuan Intelligence Technology Co., Ltd All Rights Reserved
This manual may not be reproduced, copied, transmitted or transcribed in whole or in part by any
means without the expressed written permission of Heyuan. Any shall be investigated for legal
responsibility in violation of copyright or other intellectual property rights of the Company. We check
the user manual’s contents regularly and will make necessary amendments in next version. Welcome
to give advice for some unexpected errors. The rights of upgrading without notice are reserved.
Please read this manual carefully before the product is operated. And once you start operating the
meter, you’ll be considered to have read this manual and accept all our terms. Heyuan shall not be
responsible or liable for any damages or injuries caused by improper meter installation and/or
operation.
Attention: the following symbols in this manual refer to meanings as follows
Electric Shock Symbol: Carries information about procedures which must be followed
to reduce the risk of electric shock and danger to personal health
Safety Alert Symbol: Carries information about circumstances which if not considered
may result in injury or death
The meter must be installed and operated by one who has experience with high-voltage devices or
has qualifications. Please connect the meter to correct voltage before operating the meter. Please
install and use the meter according to the user manual. Heyuan shall not be responsible or liable for
any damages or injuries caused without following the instructions in the user manual.

Contents
Chapter 1 Meter Overview ………………………………………………………………………………..1
Chapter 2 Specifications …………………………………………………………………………………1
2.1 Voltage ………………………………………………………………....................................1
2.2 Power Supply …………………………………………………………………………………1
2.3 Communication ……………………………………………………………………………….1
2.4 Digital Input ……………………………………………………………………………………2
2.5 Working Condition ……………………………………………………………………………2
Chapter 3 Dimension & Installation ……………………………………………………….……………2
3.1 Dimension (unit: mm) …………………………………………………………..……………2
3.2 Cut-out Size …………………………………………………………………………..............2
3.3 Installation Method .………………………………………………………………..............3
Chapter 4 Typical Wiring ………………………………………………………………………………….3
4.1 Wiring Instruction ……………………………………………………………………….…….3
Chapter 5 Meter Display and Operation ……………………………………………………………….4
5.1 Parameters Display ……………………………..…………………………………………..4
Chapter 6 Meter Display and Operation ………………………………………………………...........5
6.1 System Parameter Setting …………………………………………………..……………..5
6.2 Process of setting parameters ……………………………………………………………..6
6.3 Parameters Setting Steps ………………………………………………………………….7
Chapter 7 After-sales Service …………………………………………………..………………………9
Chapter 8 Contact Us ……………………………………………………………..……....……………..9

1
Chapter 1 Meter Overview
DZ81-MS3U7C is an advanced, smart networked voltmeter. It measures three phase voltage with
high accuracy. It supports standard Modbus RTU communication protocol and is equipped with 2
digital inputs.
Display: LCD Display
Chapter 2 Specifications
2.1 Voltage
Rated Voltage: 57.7V/100V or 220V/400V Voltage Range: 0~1.2Un
Accuracy: Class 0.2 Resolution: 0.1V
2.2 Power Supply
The power supply for this meter is AC85~265V(45~55HZ)/DC85~300V. Terminals for the power
supply are (L/+, N/-). The typical power supply wiring is as follows
If the quality of power is poor or there is an EMI problem, it’s recommended to equip an EMC filter
in the auxiliary power supply loop to increase resistance to interference. The wiring mode is as
follows
2.3 Communication
RS485/Modbus-RTU Communication Protocol Baud Rate: 1200~9600bps (programmable)
Remark: DZ81-MS3U7C adopts RS485 interfaces and Modbus RTU communication protocol to communicate. The
terminals are 485A and 485B. The RS485 transmission medium is shielded twisted pair. In addition, the RS485 interfaces
can also be used for device maintenance and upgrading. The communication default values are as follows
Communication Default Value
Address
Baud Rate
Data Bits
Stop Bits
Parity
01
9600bps
8
1
No

2
2.4 Digital Input
The meter is equipped with 2 digital inputs. Its wiring mode is as follows
2.5 Working Condition
Operating Temperature: -25℃～+70℃ Storage Temperature: -40℃～+80℃
Relative Humidity: 20%～90%(non-condensing)
Chapter 3 Dimension & Installation
3.1 Dimension (unit: mm)
3.2 Cut-out Size
Cut-out Size (mm)

3
3.3 Installation Method
This meter DZ81-MS3U7C should be installed in a dry and dust free environment, and avoid
exposing to excessive heat, radiation and high electrical noise source. The meters can be installed
into a standard panel of switch cabinet.
A. Remove the 2 clips from the meter and insert the meter into the panel from the front side. Make
sure that the screen is at the front of the panel.
B. Install 2 clips on the back side of the meter and fix tightly to ensure the meter is affixed to the
panel.
Chapter 4 Typical Wiring
4.1 Wiring Instruction
A. Three-phase Four-wire Wiring Mode (3LN)
B. Two-Phase Three-Line Wiring Mode (2Ln)
C. Three-Phase Three-Line Wiring Mode (2LL)

4
DZ81-MS3U7C can be used for measuring three phase voltage in low-voltage and high-voltage
systems. According to different wiring modes, corresponding wiring mode should be set on the
“Voltage Wiring Mode Setting Interface”.
Chapter 5 Meter Display and Operation
There are four buttons on the front panel, labeled button “ ”, button “ ”, button “ ” and
button “ ” from left to right. It can be used for reading real-time data and setting parameters
though the four buttons.
5.1 Parameters Display
5.1.1 Press button “ ”, it will cyclically display the real-time values of phase voltage and line
voltage. The sign in the bottom-left corner refers to the communication. The “computer” sign at left
signifies data reception. While the “computer” sign at right signifies data transmission.
Phase Voltage Line Voltage

5
The digital inputs (DI) are also displayed on the interface. As the figures below show, “ ” refers to
the disconnection of the DI while “ ” refers to the connection of the DI.
5.1.2 On real-time data display interface, press button “ ”, it will display the interface of
frequency. And then press button “ ” to return to the real-time data display interface.
Frequency
Chapter 6 Meter Display and Operation
6.1 System Parameter Setting
On real-time data display interface, press “ ” and “ ” simultaneously, it will enter the system
parameter setting interface.

6
At the setting mode:
The button “ ” is used for digital shift. Press button “ ” each time to shift one digit, which will
flash at the same time.
The button “ ” is used to plus 1. Press button “ ” each time and the flashing digit will plus 1. If
the flashing digit is 9, press button “ ” and the digit will become 0.
The button “ ” is used to minus 1. Press button “ ” each time and the flashing digit will minus 1.
If the flashing digit is 0, press button “ ” and the digit will become 9.
The button “ ” is used to confirm the setting and switch to the next setting interface. When
switching to last interface, press button “ ” again, it will exit the system parameter setting mode
and switch back to the real-time data display interface.
At any setting interface, press button “ ” and “ ” simultaneously, it will exit the setting interface
and switch back to the real-time data display interface.
6.2 Process of Setting Parameters
Password Inquiry Meter Address

7
Baud Rate Voltage Wiring Mode
PT Ratio
6.3 Parameters Setting Steps
labeled button “ ”, button “ ”, button “ ” and button “ ”
6.3.1 “PS” Interface, i.e. Password Inquiry Interface
Press buttons “ ” and “ ” simultaneously, it will enter password setting interface. The default
password is “0000”. Press button “ ” to confirm and enter “ID” interface. If the password is not
correct, it won’t enter “ID” interface
6.3.2 “ID” Interface, i.e. Meter Address Interface
This interface displays the present meter address, whose value ranges from 1 to 247. After setting,

8
press button “ ” to confirm and enter “F2” interface.
6.3.3 “BT” Interface, i.e. RS485 Communication Baud Rate Setting Interface
The default communication baud rate is “9600”. The baud rate can be set as 9600, 4800, 2400, 1200.
After setting, press button “ ” to confirm and enter “F3” interface.
6.3.4 “UL” Interface, i.e. Voltage Wiring Mode Setting Interface
There are 3 options for the voltage wiring modes, i.e. “3Ln” referring to 3-phase 4-wire wiring mode;
“2Ln” referring to 2-phase 3-wire wiring mode and “2LL” referring to 3-phase 3-wire wiring mode.
After setting, press button “ ” to confirm and enter “PT” interface.
6.3.5 “PT” Interface, i.e. PT Ratio Setting Interface
This interface displays the present PT ratio, whose value ranges from 1 to 9999. After setting, press
button “ ” to confirm and switch back to voltage display interface.
For example, if the PT ratio is 10KV/400V, the PT ratio will be 25, that is to divide 10,000 by 400.
6.3.6 “PS” Interface, i.e. Password Setting Interface
On real-time data display interface, press button “ ”, button “ ” and button “ ”
simultaneously to enter the other “PS” interface, which is password setting interface. Enter meter
password, whose default is “0000”. After setting, press button “ ” to confirm and exit password
setting interface and then switch back to the real-time data display interface.
Password Inquiry Interface Password Setting Interface

9
Chapter 7 After-sales Service
Product Warranty
1. The product warranty period is one year.
2. The company is responsible for free maintenance or exchange within one-year warranty period.
3. The cost of the components and freight shall be charged for improper meter installation and/or
operation.
4. Over the warranty period, part of the maintenance cost according to actual situation will be
charged.
Service Guarantee
1. Product technical consulting and quality complaints will be replied within 12 hours.
2. Solutions for quality complaints will be provided within 24 hours.
3. Except statutory holidays and force majeure.
Chapter 8 Contact Us
Headquarter Add.: 7F No.1 Aosheng Building, 1166 Xinluo Street, High-tech Development Zone,
Jinan, P.R. China 250101
Factory Add.: 2F Innovation Factory, Feiyue Road, High-tech Development Zone, Jinan, P.R. China
250101
Tel: [phone] 863
E-mail: [e-mail]
Website: www.heyuanintel.com