DC Insulation Monitoring Device for EV Charger

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Highlight

What’s the Highlight of Acrel AIM Series DC Insulation Monitoring Device for EV Charger?

Voltage

100-1000V DC
Over-voltage: 110%
Under-voltage: 90%

Insulation Resistance

Measurement:1kΩ~10MΩ
Warning:10kΩ~10MΩ
Leakage: ≤5μF
Cycle: 5~500s

Auxiliary Power

DC 9-36V
Consumption ≤6W

Communication

RS485
MODBUS-RTU

Application

What’s the Application of Acrel AIM Series DC Insulation Monitoring Device?

Parameter

What’s the Parameter of Acrel AIM Series DC Insulation Monitoring Device for EV Charger?

Project		Qualification
Accessory Power Supply		DC 9~36V
Maximum Power Dissipation		≤6W
Voltage Monitoring	Voltage range	AIM -D 100-TH：DC 100~1000V ； AIM -D 100-TL：DC 0~100V
	Certainty of measurement	Level 0.5
	Overvoltage threshold	110% of the rated voltage
	Underpressure threshold	90%, and the rated voltage
Insulation Monitoring	Insulation resistance range	1kΩ~10M Ω
	Warning scope	10kΩ~10MΩ
	Certainty of measurement	1~10kΩ：±1k；10k~500k：≤3%
	System leakage capacitance	≤5μF
	Insulation monitoring mode	Cycle monitoring: 5~500s can be set; Communication trigger: read as demand
	Insulation monitoring time	5,00 ms / time; 1,000 ms / time
	Internal DC impedance	＜1MΩ
The alarm way		LCD, LED indicator lamp, relay output
Alarm output		3 sets of relay output, often open or often closed can be set
Contact capacity		5A 250V AC； 5A 30V DC
Failure logging		20 fault records
Communication mode		RS485 communication, and the Modbus-RTU protocol
Installation		Guide rail installation
Levels of protection		IP30
Enviromental parameter	working temperature	-40~+75℃
	Storage temperature	-40~+125℃
	relative humidity	<95%, without condensation
	above sea level	<2000m

Function

What’s the Function of Acrel AIM Series DC Insulation Monitoring Device for EV Charger?

Application

Monitoring of DC charging stations for electric and hybrid vehicles

Nominal Voltages

Nominal voltages up to DC 1000 V

Mode

Switchable between CCS (Combined Charging System) and CHAdeMO

Measurement of the system voltage (true RMS)

with undervoltage and overvoltage detection

Measurement of DC system voltages to earth

L+/PE and L-/PE

Monitoring the Insulation Resistance

Monitor the insulation resistance of the positive and negative poles of the DC system to the ground. When the insulation resistance is lower than the set pre-warning and alarm values, pre-warning and alarm signals can be issued.

Relay Output

2 relay outputs, you can choose normally open or normally closed mode

Communication

1 RS485 interface, using Modbus-RTU protocol, can carry out data exchange.

Alarm

Monitor the voltage fluctuations of the DC system. When overvoltage or undervoltage occurs, an alarm signal can be issued in time.
Normal Voltage: DC 100~1000V; Overvoltage threshold: ≥110%; Undervoltage threshold: ≤90%

Pre-warning

2 sets of independently adjustable setting values, pre-warning values and alarm values can be set.

SOE

Record the time when the alarm occurs and the fault type to facilitate staff troubleshooting.

LED Indicator

operation, communication and fault, overvoltage, undervoltage

LCD Display

128*32 dot matrix LCD display parameter information

Terminal

Plug-in terminals for easy wiring and installation

Din-rail Installation

35mm Dinrail

Size

How to wire the Acrel AIM Series DC Insulation Monitoring Device for EV Charger?

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Wiring

AIM-D 100-T series DC insulation monitor has terminals on top and bottom, with top terminals as shown in the figure below:

Positive electrode is ground to the negative electrode

The top of the instrument is divided into two rows of wiring terminals. The TOP line terminal is instrument auxiliary power supply, requiring DC24V power supply, 1st access to power supply positive electrode and 2nd access to power supply negative electrode. The BOT line terminal is the access system wiring, no. No.11 is the positive of the DC system, No.14 is the negative of the DC system, and No.3 is the PE grounding row of the access site.

The lower terminals are shown below:

RS 485 Communication insulation early warning, insulation alarm, voltage alarm

Instrument lower terminal terminal 21,22 is RS 485 communication terminal, 21 to A, 22 to B, not back. Terminal 40 to 45 are relay output terminals, 40 and 41 are DO 1 output, indicating early warning, 42 and 43 are DO 2 output, indicating alarm, 44 and 45 are DO 3 output, indicating underpressure alarm. The relay output can be set in normally open or normally closed mode, and can be connected to external buzzer or sound and optical alarm. The relay is passive output and needs external power supply.

Wiring specification description:

Auxiliary power supply, functional grounding, DC system positive and negative electrode wiring, relay output wiring, 1.5mm can be selected²Multi-core copper wire. The RS485 communication wiring can be selected as 0.75~1.5mm²The shielded twisted pair wire.