Overview
The AIM-D100-CA DC insulation monitor is specifically designed for unearthed DC systems (IT systems) in electric vehicle charging infrastructures. It continuously monitors the insulation resistance of both positive and negative poles to earth, ensuring operational safety. When insulation resistance falls below preset thresholds, the device issues pre-alarm or alarm signals via LED indication. Optimized for DC 100-1000V systems, it is widely used in EV charging stations, energy storage systems, substation DC panels, UPS systems, and photovoltaic DC networks. The product features a metal enclosure with wall or DIN rail mounting options and plug-in terminals for easy installation.
Highlight
Optimized for EV Charging
- DC 100-1000V, 0.5% accuracy
- Compliant with GB/T 18487.1
- Perfect for charging piles
High Precision Insulation
- 1kΩ-10MΩ, accuracy ≤3%
- Response: 500ms or 1000ms
- System leakage ≤5μF
Flexible Communication
- RS485 Modbus-RTU
- Baud rate: 4800-38400bps
- DIP switch configurable
Compact & Robust Design
- Metal case, wall or rail mount
- Low power: ≤3W
- Plug-in terminals for easy wiring
Function
| Insulation Monitoring | Continuously measures insulation resistance of positive and negative poles to earth. Range: 1kΩ～10MΩ. Pre-alarm and alarm thresholds can be set independently. |
| Voltage Monitoring | Real-time measurement of system voltage (pole-to-pole) and pole-to-earth voltages. Range: DC 100～1000V |
| LED Indication | Panel LEDs indicate running, communication, and fault status (pre-alarm flashing, alarm steady). |
| Communication | One RS485 interface with Modbus-RTU protocol for SCADA integration. Baud rate and address configurable via DIP switches |
| Flexible Mounting | Metal enclosure supports wall mounting or DIN rail mounting (with supplied plastic bracket). |
| Plug–in Terminals | Plug-in terminal blocks simplify wiring and maintenance |
| Communication Trigger Mode | Default communication trigger mode: reading any measurement register initiates an insulation measurement cycle, ideal for on-demand checking in EV charging applications. |
Specification
| Parameter | Value |
| Auxiliary Power | DC 12～36V |
| Max. Power Consumption | ≤3 W |
| Voltage Measurement Range | DC 100～1000V |
| Voltage Accuracy | Class 0.5 |
| Insulation Resistance Range | 1 kΩ ～ 10 MΩ |
| Pre-alarm / Alarm Setting Range | 10 kΩ ～ 10 MΩ |
| 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) |
| Alarm Indication | LED (pre-alarm flashing, alarm steady) |
| 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 (default) or periodic trigger |
| Insulation Capacitance Time | 0～60000 ms adjustable (for systems >5μF) |
| Mounting | Wall mounting or DIN rail (with supplied bracket) |
| 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 is specifically designed for electric vehicle charging stations (DC charging piles) to perform insulation checks before charging, complying with GB/T 18487.1 requirements.
In default mode, reading any measurement register (e.g., insulation resistance) via Modbus automatically triggers one insulation measurement cycle. This is ideal for on-demand checking in EV charging applications.
No, it uses LED indicators for alarm status (flashing for pre-alarm, steady for alarm). Alarm information is also available via Modbus communication.
Baud rate and address are configured via a 4-position DIP switch on the device. 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-CA allows flexible threshold setting within 10kΩ-10MΩ.
Summary
The AIM-D100-CA DC insulation monitor is a compact, high-precision solution tailored for electric vehicle charging stations. It delivers accurate insulation and voltage measurement, flexible Modbus communication, and on-demand triggering—perfectly aligned with GB/T 18487.1 requirements. Its metal enclosure, dual mounting options, and low power consumption make it a reliable and easy-to-integrate choice for EV charging infrastructure, energy storage, and industrial DC systems.
