Overview
The AIM-D100-CAD dual-channel DC insulation monitor is specifically engineered for unearthed DC systems (IT systems) in dual-gun electric vehicle charging stations. It continuously monitors the insulation resistance of both positive and negative poles to earth for two independent DC circuits. When insulation resistance falls below preset thresholds, the device issues pre-alarm or alarm signals via RGB LED indicators. Designed for DC 100-1000V systems, it is ideal for dual-gun charging piles, energy storage systems, substation DC panels, UPS systems, and photovoltaic DC networks. The monitor features a communication-triggered measurement mode, ensuring minimal impact on system insulation, and offers flexible rail or wall mounting with plug-in terminals.
Highlight
Dual Independent Channels
- Monitors two DC circuits separately
- Independent pre-alarm/alarm thresholds
- Ideal for dual-gun charging piles
High Precision Insulation
- Range 1kΩ-10MΩ, accuracy ≤3%
- Response time 500ms or 1000ms
- System leakage ≤5μF
Flexible Communication
- RS485 Modbus-RTU
- Baud rate 4800-38400bps (DIP switch)
- Communication-triggered measurement
Compact & Versatile Design
- Rail or wall mounting
- Low power ≤6W, plug-in terminals
- RGB LED for dual-channel status
Function
| Dual Independent Insulation Monitoring | Independently monitors insulation resistance of positive and negative poles to earth for two DC circuits. Range: 1kΩ～10MΩ. Pre-alarm and alarm thresholds can be set separately for each channel. |
| Voltage Monitoring | Real-time measurement of system voltage (pole-to-pole) and pole-to-earth voltages for each channel. Range: DC 100～1000V. |
| Dual Independent Alarm Indication | Two RGB LEDs indicate status: green (running), yellow (pre-alarm flashing), red (alarm flashing) for each channel independently |
| Communication–Triggered Measurement | Reading any measurement register via Modbus automatically triggers one insulation measurement cycle for the corresponding channel, minimizing system impact. |
| DIP Switch Configuration | 8-position DIP switch allows easy setting of baud rate and communication address (1-63) without software |
| Flexible Mounting | Plastic enclosure supports both 35mm DIN rail mounting and wall mounting with pull-out mounting clips |
| Plug–in Terminals | Plug-in terminal blocks simplify wiring and maintenance. |
| Low Power Consumption | Maximum power ≤6W, suitable for energy-sensitive applications. |
Specification
| Parameter | Value |
| Auxiliary Power | DC 12～36V |
| Max. Power Consumption | ≤6 W |
| Voltage Measurement Range | DC 100～1000V (per channel) |
| Voltage Accuracy | Class 0.5 |
| Insulation Resistance Range | 1 kΩ ～ 10 MΩ (per channel) |
| Pre-alarm / Alarm Setting Range | 10 kΩ ～ 10 MΩ (independent per channel) |
| Insulation Accuracy | 1～10 kΩ: ±1 kΩ 10～500 kΩ: ≤3% |
| Permissible System Leakage Capacitance | ≤5 μF |
| Insulation Monitoring Time | 500 ms / 1000 ms per cycle (selectable per channel) |
| Alarm Indication | RGB LEDs (green: run, yellow: pre-alarm, red: alarm) |
| Communication Interface | RS485, Modbus-RTU protocol |
| Baud Rate | 4800, 9600, 19200, 38400 bps (DIP switch selectable) |
| Communication Address | 1～63 (DIP switch selectable, default 1) |
| Insulation Monitoring Method | Communication trigger (reading any measurement register) |
| Insulation Capacitance Time | 0～60000 ms adjustable (per channel, for systems >5μF) |
| Mounting | 35mm DIN rail or wall mounting (with clips) |
| Protection Degree | IP30 |
| Operating Temperature | –20 °C ～ +60 °C |
| Storage Temperature | –25 °C ～ +75 °C |
| Relative Humidity | <95% (non-condensing) |
| Altitude | <2000 m |
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FAQ
It has two completely independent measurement channels with separate terminals Each channel has its own set of registers for insulation resistance, voltage, and alarm thresholds. The RGB LEDs indicate status for each channel separately.
The monitor stays in standby mode most of the time, only connecting to the DC system when a measurement is triggered by a Modbus read command. This minimizes the impact on system insulation and is ideal for on-demand checking in EV charging applications.
Yes, pre-alarm and alarm thresholds can be independently configured for each channel (positive and negative poles) via Modbus registers. The default pre-alarm is 100kΩ, alarm is 50kΩ for both channels.
An 8-position DIP switch on the device sets the baud rate (using BAUD1 and BAUD2) and the Modbus address (using ADD1-ADD6, binary coded). No software configuration is needed.
For a 200-750V DC system: R > 100-375kΩ is safe; R ≤ 20-75kΩ is considered a fault and charging should stop. The AIM-D100-CAD allows flexible threshold setting within 10kΩ-10MΩ to meet this standard.
Summary
The AIM-D100-CAD dual-channel DC insulation monitor is a specialized solution for dual-gun electric vehicle charging stations, offering independent monitoring of two DC circuits in a single device. With high-precision insulation measurement, communication-triggered operation, and flexible DIP switch configuration, it ensures safe and reliable charging while minimizing system impact. Its compact design, dual mounting options, and RGB status indication make it easy to integrate into EV charging infrastructure, energy storage systems, and industrial DC networks.
