Overview
The AIM-T500L is an advanced insulation monitoring device with integrated fault location capability for industrial IT power distribution systems (unearthed systems). It continuously monitors insulation resistance to earth in real time. When insulation drops below preset thresholds, it issues alarms and locates the faulty branch, enabling rapid fault clearance and minimizing downtime. Ideal for mines, glassworks, chemical plants, explosion-hazard areas, computer centres, and emergency power supplies.
Highlight
Fault Location Function
- Supports fault location
- Up to 8 branches
Dual Communication
- RS485 Modbus-RTU
- CAN custom protoco
Insulation Monitoring
- 1kΩ-10MΩ range
- Response <5s (Ce=1μF)
Wide Auxiliary Power
- AC85-265V & DC120-370V
- Power <8W
Function
| Insulation Monitoring | Continuously measures insulation resistance of unearthed AC/DC systems up to AC 690V / DC 800V. Range 1kΩ-10MΩ, response time <5s (with 1μF leakage capacitance). Supports higher voltages via external AK terminal |
| Fault Location | Integrated fault location function identifies the specific branch with insulation failure. Works with external locating devices to pinpoint ground faults in complex distribution networks. |
| Dual Communication | Built-in RS485 interface with Modbus-RTU protocol for SCADA integration, plus CAN interface with custom protocol dedicated for fault location data exchange. |
| Three–Stage Alarm Output | Three independent relay outputs (error, pre-alarm, main alarm) with adjustable thresholds (10kΩ-10MΩ). Dry contacts for external alarm devices. |
Specification
| Parameter | Value |
| Model | AIM-T500L |
| Auxiliary Power | AC85～265V 或 DC120～370V |
| Power Consumption | < 8 VA |
| Monitored System Voltage | AC 0～690V, DC 0～800V |
| Rated Frequency | 40～60 Hz |
| Insulation Measuring Range | 1 kΩ ～ 10 MΩ |
| Pre-alarm / Alarm Setpoint Range | 10 kΩ ～ 10 MΩ |
| Response Time (with Ce = 1 μF) | < 5 s |
| Permissible System Leakage Capacitance | < 500 μF |
| Internal Measuring Voltage | < 48 V |
| Internal Measuring Current | < 270 μA |
| Internal DC Resistance | ≥ 180 kΩ |
| Relay Outputs | 3 × change-over (error, pre-alarm, alarm) |
| Communication Interface | RS485 (Modbus-RTU), CAN (自定义协议) |
| Fault Location Function | 支持 |
| Operating Temperature | –20 °C ～ +60 °C |
| Storage Temperature | –20 °C ～ +70 °C |
| Relative Humidity | 5 % ～ 95 % (non-condensing) |
| Altitude | ≤ 2500 m |
| Cut-out Dimensions | 126 × 74 mm |
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FAQ
The AIM-T500L works with external locating devices (sensors) installed on each branch. When an insulation fault occurs, the monitor sends a locating signal, and the sensor on the faulty branch responds, identifying the exact fault location.
H and L are the CAN communication interface terminals. Connect them to the CAN bus for fault location data exchange with external locating devices or upper systems.
The system can support up to 8 branches for fault location, depending on the configuration of external locating sensors.
Yes. The RS485 interface (Modbus-RTU) is used for SCADA integration, while the CAN interface (custom protocol) is dedicated to fault location communication. They operate independently and simultaneously.
Yes, it shares the same form factor, auxiliary power, and basic monitoring functions. For fault location, additional sensors and CAN bus wiring are required.
Summary
The AIM-T500L is the most comprehensive insulation monitor in the AIM-T series, combining high-precision insulation monitoring with integrated fault location capability. It offers extended measuring range, fast response, support for higher system voltages, and dual communication interfaces for both SCADA integration and dedicated fault location data exchange. With three-stage alarm outputs and self-test features, it provides complete protection for complex industrial IT systems where rapid fault identification is critical.
