UB1K-ARH DC Ground Insulation Monitoring Relay

1. Introducció

The GYDCG-UB1K series, including the UB1K-ARH model, is a DC-to-ground insulation monitoring module designed for real-time monitoring and protection of DC floating systems. Utilizing an unbalanced bridge principle, it accurately monitors the positive and negative pole-to-ground insulation resistance within a range of 0Ω to 10MΩ. Additionally, it can detect DC voltage from 0V to 1000V. The module features RS485 communication for data acquisition and alarm threshold configuration. An integrated fault relay activates, and the L2 indicator illuminates when insulation resistance falls below the set threshold. Users can select passive or automatic reset modes via DIP switches, and the module supports manual or remote reset.

Característiques principals:

• Real-time online monitoring with high reliability.
• High accuracy in DC voltage and insulation resistance measurements.
• Supports manual or remote initiation and reset.
• Equipped with RS485 communication function (Standard MODBUS protocol).
• Compact size, lightweight design, facilitating ease of operation, installation, and replacement.

2. Especificacions

Àrees d'aplicació:

• Electric vehicle chargers and charging piles
• Sistemes fotovoltaics
• Energy storage systems
• Fonts d'alimentació ininterrompuda (UPS)
• DC screens and other DC floating systems

3. Configuració i instal·lació

The UB1K-ARH module is designed for DIN rail mounting. Ensure the module is securely fastened in a suitable enclosure, away from excessive heat, moisture, and vibration.

3.1 Terminal Connections Overview

Refer to the diagram below for terminal identification. All wiring should be performed by qualified personnel, adhering to local electrical codes and safety standards.

• Top Terminal Block:
  • D+, B, A, D-: RS485 communication interface. Connect to your RS485 network for data acquisition and remote configuration. Typically, A and B are the primary data lines.
• Bottom Terminal Block:
  • +, -: Power Supply Input (19-36 VDC). Connect to a stable DC power source.
  • R, S, G, X, C, Y: These terminals are for connecting the DC floating system to be monitored and for relay outputs.
    • G: Typically used as the ground reference for the monitoring circuit.
    • X, C, Y: Relay output contacts (Common, Normally Open, Normally Closed). These are used for alarm signaling.
    • R, S: These terminals are likely for connecting the positive and negative poles of the DC system under monitoring.

    Nota: For precise wiring of the DC system and relay outputs, always consult the detailed wiring diagram provided in the complete product documentation.

3.2 Configuració del commutador DIP

The module features a set of DIP switches (labeled 1-6) for configuring operational parameters such as alarm resistance threshold and reset mode. The labels "R(KΩ)" and "X10 LAT" near the switches indicate their functions.

• Alarm Resistance Threshold: Use the DIP switches to set the desired insulation resistance threshold (e.g., 1kΩ to 10MΩ). Specific switch combinations correspond to different resistance values or multipliers (e.g., x1, x10, x100).
• Mode de restabliment: Configure the DIP switches to select between passive reset, automatic reset, or other available reset options. The "LAT" (Latching) setting likely controls whether the alarm latches until manually reset or automatically clears when the fault is resolved.

Refer to the detailed configuration table in the complete product documentation for precise DIP switch settings for each parameter.

4. Funcionament

4.1 Llums indicadors

• PWR: Power indicator. Illuminates when the module is receiving adequate supply voltage (19-36 VDC).
• L1: General status indicator (specific function may vary, refer to full documentation).
• L2: Alarm indicator. Illuminates when the monitored insulation resistance falls below the configured alarm threshold.

4.2 Funcionalitat d'alarma

When the insulation resistance of the DC floating system drops below the set threshold, the L2 indicator will light up, and the internal fault relay will activate. The relay output contacts (X, C, Y) will change state, which can be used to trigger external alarms or control systems.

4.3 Reinicialització d'alarmes

The module supports several reset methods:

• Restabliment manual: A physical button or switch (if present, not explicitly shown) can be used to clear the alarm.
• Remote Short Reset: A momentary short circuit across designated terminals (refer to wiring diagram) can reset the alarm.
• Communication Reset: The alarm can be cleared via RS485 communication commands.
• Restabliment automàtic: If configured via DIP switches, the alarm will automatically clear once the insulation resistance returns above the threshold.

4.4 Comunicació RS485

The UB1K-ARH module communicates via RS485 using the standard MODBUS protocol. This allows for:

• Reading real-time insulation resistance values.
• Reading real-time DC voltage valors.
• Setting alarm resistance thresholds remotely.
• Performing remote resets.

Refer to the MODBUS communication protocol documentation for register addresses and command structures.

5. Manteniment

The UB1K-ARH is designed for reliable, long-term operation with minimal maintenance. However, periodic checks are recommended:

• Inspecció visual: Inspeccioneu periòdicament el mòdul per detectar qualsevol signe de danys físics, connexions soltes o corrosió.
• Neteja: Si cal, netegeu suaument l'exterior del mòdul amb un drap suau i sec. No utilitzeu productes de neteja abrasius ni dissolvents.
• Comprovació de la funcionalitat: Regularly verify the alarm functionality by simulating a low insulation resistance condition (if safely possible and recommended by advanced documentation) or by monitoring its readings via RS485.
• Actualitzacions de firmware: Check with the manufacturer for any available firmware updates that may enhance performance or add features.

Desconnecteu sempre l'alimentació abans de realitzar qualsevol manteniment o inspecció.

6. Solució De Problemes

If the problem persists after attempting these solutions, contact technical support.

7. Consells d'usuari

• For critical applications, consider setting the alarm threshold slightly higher than the absolute minimum required to allow for early detection of insulation degradation.
• Regularly log insulation resistance values via RS485 to establish a baseline and identify trends, which can help predict potential faults before they become critical.
• When configuring DIP switches, always power off the module first to ensure settings are applied correctly upon restart.

8. Garantia i Suport

For warranty information, technical support, or service inquiries, please contact the manufacturer or your authorized distributor. Ensure you have your product model number (UB1K-ARH) and purchase details available when seeking support.