ACREL DJSF1352-RN DC energy meters Application in UPS metering system

Abstract: This article introduces the application of “Acrel” DJSF1352-RN DC meter in the UPS metering system. It is mainly used for the measurement of the output energy in the UPS system, and the measurement, communication and control of the circuit system through the Hall sensor.

1. Project Overview

The company is a battery production company, mainly engaged in the production and supply of industrial batteries and UPS. The customer needs to use a DC meter for monitoring and measuring the electrical energy at the output of the UPS.

2. DJSF1352-RN DC Energy Meters

DJSF1352-RN rail-mounted DC power meter designed for telecommunications base stations, DC charging piles, solar photovoltaic and other applications, this series of meters can measure the voltage, current, power and forward and reverse energy and so on in the DC system.The actual use of the site, you can measure the total power, but also measure the energy within a specified period of time. The test results can be used for local display, but also with industrial control equipment, computers to form a measurement and control system.

The meter can have infrared communication interface and RS-485 communication interface, and supports Modbus-RTU protocol and DLT645-97 (07) protocol at the same time.The meter can have relay alarm output and digital input function;You can set the ratio, alarm, and communication through the meter panel keys according to different requirements.The meter can have event recording of switch (Modbus protocol), programming and event setting records (645 protocol), instantaneous and timing freeze function of data (645 protocol), maximum and minimum value recording function of voltage and current power.

3. Type and Function Description

Note：when dual DC input（D）function is selected，if Hall current sensor input is used in current channel, a power supply module shall be provided to supply power to the second Hall sensor; if D function is not provided, the built-in power supply of electric meter can be used.

Technical parameters			Index
Input	Nominal value		Voltage input range	Current input
			DC 0-1000V	Hall sensor：0-20mA、4-20mA、0-5V，0-10V and so on.
	Overload		1.2 times rated (continuous); 2 times rated/1 second;
	Power consumption		Voltage: ≤0.2VA, current ≤0.1VA
Accuracy class			Class 1
Function	Display		8-bit segment LCD screen (LCD)
	Communication Interface		RS485（two options）
	Communication protocol		Modbus-RTU，DL/T 645-2007
	Switch		Switch output		2 Relay outputs, 2A/30VDC or 2A/250VAC
			Switch input		2 dry contact inputs
	Pulse output		A second pulse output, a energy pulse output
			See the SYS->PLUS display in the meter menu settings. For example: The meter displays 100, which is 100imp/kWh
Power Supply	Voltage range		AC/DC 85-265V or DC24V(±10%) or DC48V(±10%)
	Power consumption		≤ 3W
Power frequency withstand voltage			Power supply // Voltage input // Current input // Relay output and switch input // Communication interface / / Pulse output 3kV/1min Power supply // Relay output // Voltage input // Current input 3kV/1min Pulse output // Communication interface // Switch input 2kV/1min
Impulse withstand voltage			±6KV
Insulation resistance			≥ 40M Ω
Average barrier-free working hours			≥50000h
Environment		Temperature	Normal operating temperature: -25 °C ~ +65 °C; Limit working temperature: -40 °C ~ +70 °C; Storage temperature: -40℃～+80℃
		Humidity	≤93%RH, no condensation, no corrosive gas
		Altitude	≤2500m

4. Customer Requirements

The customer wants to measure the actual output power of the UPS to calculate the conversion ratio of UPS energy storage to energy consumption. The UPS input end uses our ADL series electric meter, the output end uses DJSF1352-RN DC meter, and the electrical signal is taken through the shunt in order to achieve the purpose of output measurement.

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