Saci AR4DCT User manual

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AR4DCT
DIN-rail Multi-function DC Power Meter
User Manual

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Content
1. SAFETY INSTRUCTIONS.........................................................................................................................................1
2. PRODUCT DESCRIPTION........................................................................................................................................1
2.1 OVERVIEW................................................................................................................................................................1
2.2 FUNCTION.................................................................................................................................................................1
MAIN MODULE (AR4DCT)...........................................................................................................................................1
2.3 TECHNICAL PARAMETER..........................................................................................................................................2
2.4 ENERGY METERING..................................................................................................................................................3
2.5 MAX./MIN.VALUE AND DEMAND...............................................................................................................................3
2.6 DIGITAL INPUT..........................................................................................................................................................3
2.7 RELAY OUTPUT.........................................................................................................................................................3
2.8 COMMUNICATION .....................................................................................................................................................4
3. INSTALLATION AND WIRING..................................................................................................................................4
3.1 DIMENSION...............................................................................................................................................................4
3.2 INSTALLATION ..........................................................................................................................................................4
3.3 WIRING.....................................................................................................................................................................5
TYPICALWIRING..............................................................................................................................................................5
3.3.1AR4DCT +MR4DCT +DIO-02.........................................................................................................................5
4. OPERATION ................................................................................................................................................................8
4.1 PANEL DESCRIPTION................................................................................................................................................8
4.2 INSTRUCTION FOR OPERATION KEYS.......................................................................................................................8
4.3 INSTRUCTION FOR MEASUREMENT INTERFACE .......................................................................................................8
5. SETTING ......................................................................................................................................................................9
5.1 PROGRAMMING MODE..............................................................................................................................................9
6. COMMON PROBLEMS AND TROUBLESHOOTING.........................................................................................14
ABOUT COMMUNICATION ..............................................................................................................................................14
INCORRECT MEASUREMENTS.......................................................................................................................................14
ABOUT INCORRECT POWER RUNNING..........................................................................................................................15
THE METER DOES NOT RESPOND TOANY OPERATION .................................................................................................15
OTHER ABNORMAL PHENOMENA ..................................................................................................................................15

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1. Safety instructions
Thank you for choosing the meter researched and developed by our company. In order to make it convenient for you
to purchase and use the meter safely, correctly and efficiently, please read this manual carefully before using the product,
and pay attention to several points as follows.
CAUTION:
◆Make sure only the qualified technicians perform the installation and maintenance;
◆Before performing wiring operation to the meter, make sure the input signal and the power supply are switched off;
◆The proper voltage detecting device should be used to guarantee no voltage in any part of the meter;
◆The electrical parameters supplied should be within the rated range;
The following situations may result in damages to the meter or cause mistakes in the operation of the meter.
◆The voltage of the auxiliary power supply goes beyond the rated range.
◆The frequency of the power distribution system goes beyond the rated range.
◆The input polarity of the voltage or the current is incorrect.
◆Remove or connect the communication plugs without powering off.
◆Connect the terminal wires against the related instructions.
Please don’t touch the terminals when the meter is in operation!
2. Product description
2.1 Overview
AR4DCT are used to manage multi-circuit DC power supply such as photovoltaic combiner box. They can measure
basic electrical variables such as voltage, current, power and energy of up to 33 DC circuits. AR4DCT can realize current
measurement of 33 circuits at most, 4 digital inputs and 2 relay outputs. They also have over current alarm, over voltage
alarm, under voltage alarm and DI linkage alarm functions. In addition, AR4DCT has one temperature measurement
function. Communication interface on the meter makes it simple to connect it to smart distribution system and energy
management system to share monitoring data and energy quality data.
2.2 Function
Main module (AR4DCT / AR4DC)
Function
Instruction
Channel
Current measurement
External Hall sensor input
9
Voltage measurement
Direct input
1
Energy metering
Bi-directional energy
■
Alarm protection
DI linkage alarm protection
■
Temperature alarm protection
■
Over current alarm protection
■
Over voltage alarm protection
■
Under voltage alarm protection
■
Standard communication
RS485(Modbus-RTU)
■

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Display mode
Segment LCD
Installation method
DIN-rail installation
Extendsion module
Code of input and
output module
Instruction
MR4DCT
12 channels of current measurement
Up to 2 MR4DC can be connected.
DIO-02
4 digital inputs/2 relay outputs
2.3 Technical parameter
Item
Parameter
Accuracy
Electrical variables
0.2%
Energy
1.0S
Signal
input
Temperature 注
2% ，NTC thermistor ，-10 ～110℃, (Only
available in AR4DCT)
Voltage
Range
Direct input
AR4DCT:0-1500V
Consumption
<0.6VA
Impedance
>6MΩ
Current
Range
External Hall sensor input，-4～4V
Consumption
<0.01VA(each circuit)
Impedance
>200kΩ
Power
supply
Working range
AC/DC（80～270）V
Frequency
50/60 Hz
Consumption
≤5VA
Output
Energy pulse
Photoelectric isolation output, pulse width
80ms±20%, frequency <10Hz
Relay output
Capacity AC250V 5A or DC30V 5A
Isolation voltage between contact and coil
2500VAC rms
Input
Digital input
Passive dry optocoupler isolation input, isolation
voltage 2000VAC rms
Communi
cation
module
RS485 port
Modbus-RTU protocol, communication speed
2400～38400bps, no check, odd check and
even check optional
Mechanic
al feature
Weight
About 300g
Dimension
AR4DCT main module 72x90x63.5mm
MR4DC module 72x90x63.5mm
DIO-02 module 36x90x63.5mm
IP protection
Front case IP50

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Rear case IP20
Environm
ent
condition
Working environment
-25～70℃
Storage environment
-40～85℃
Rated humidity
5～93%（no condensation at 50℃）
Pollution degree
2
Measurement type
III
Insulation
Between signal, power supply, output terminal
and case resistance > 100MΩ
Power supply and input > AC 3kV
Power supply and output > AC 3kV
Input and output> AC 2kV
EMC
III
2.4 Energy metering
Detailed energy metering function is as follows,
- Total bi-directional energy
- Bi-directional energy of each circuit
Min. resolution is 0.01kWh. Energy display range is 99999999000 kWh (99.9 billion kWh). User can clear energy data
by manual according to practical requirements after inputting correct password.
2.5 Max./min. value and demand
Meter can record max./min. value of voltage, current and power, and save these data of present month, last month
and the month before last month. Please refer to communication list for detailed recording parameters.
Meter can measure the demand of current and power in each circuit. Max./min. value and demand only can be read
through communication, but not can be shown on the panel of meter.
2.6 Digital input
This meter supports 4 digital inputs. The digital input uses the method of dry contact input. DC 15V operation power
supply is provided inside the meter without the need for external power supply. It can be used to monitor closing/opening
status, handcart position, operation status of capacitance compensation cabinet, etc. The status information can be
transmitted remotely to monitoring system through communication interface so as to realize automatic opening and
closing with the remote/alarm relay function.
2.7 Relay output
The meter supports two relay outputs.
The relay output has four different work modes: off, remote control and off-limit alarm.
Off: relay output function is off, and the status relay returns to defaulted status.
Remote control: to receive PC and PLC command, and to control the closing and opening of relay.
Off-limit alarm: set corresponding relay as “Off-limit alarm” mode, set alarm electrical variable in “Mode” item, set
alarm delay time in “Delay” item, set alarm limit percentage of electrical variable in “Value” item, set hysteresis value
percentage in “Recover” item.

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2.8 Communication
Meter has one RS485 communication interface adopting standard Modbus-RTU protocol. RS485 interface should be
connected with STP. One piece of bus can be connected with 32 meters at most. The start and end terminals of bus can
be connected with terminal resistance.
3. Installation and wiring
3.1 Dimension
3.1.1 AR4DCT main module dimension
72
90
63.5
35.5
3.1.2 MR4DCT module dimension
72
90
63.5
35.5
3.1.3 DIO-02 module dimension
36
90
63.5
35.5
3.2 Installation
Fixed on 35mm standard rail

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3.3 Wiring
Typical wiring
3.3.1 AR4DCT + MR4DCT + DIO-02
Other typical wiring

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Note:
1. Auxiliary power supply：AC/DC (80～270)V
2. Rated current of fuse：0.5A
3. AR4DCT :Voltage input: input voltage should not be higher than 1500V;
4. Current input: input current should be connected via Hall sensor;
5. Please make sure the directions of voltage an current are same;
6. Wiring mode setting inside the meter must be the same as external wiring method.

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Instruction for No. of wiring terminals are as follows,
Power supply
1,2
AC/DC
Current signal
30-57
Current input
Voltage signal
11,14
Voltage input
Energy pulse
output
47,48
Active energy pulse output
RS485
communication
58,59
Corresponding to A and B
Relay output
15—17
2 relay outputs, 16 is common end
Digital input
70—74
4 digital inputs, 70 is common end
Temperature
sensor input
61 ,62
Only available in MR4DCT

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4. Operation
4.1 Panel description
Display
screen
Indication
light
Keys
Front panel includes three parts which are data display screen, LED power supply indication light and operation
keys.
4.2 Instruction for operation keys
Keys
Measurement interface
Programming interface
自检
Switch main interfaces
Select a bit or modify an item
消音
Check more information at
present interface in cycle
Modify data at the selected bit or
select an item
Menu
翻页
Keep pressing it for 3
seconds to enter
programming mode
Cancel or return to upper level menu
通道
Confirm or enter next level menu
4.3 Instruction for measurement interface
Measurement interface
Instruction
Voltage value
U = 201V
Show current value of first circuit: I-01 = 258A,
Press
消音
to check current value of other circuits (21
circuits at most).
Show total power P = 99.00MW
Press
消音
to check power value of other circuits (21
circuits at most).
Press
消音
to check export energy and import/export
energy of other circuits (21 circuits at most).
Show the status of digital input
Show the status of relay