Bender ISOEV425-D4-4 Digital Controller

1. Product Description

The Bender ISOEV425-D4-4 is a highly sensitive earth fault monitor designed for the continuous monitoring of the insulation condition in AC power systems. It is part of Bender’s ISOEV series and is specifically configured to monitor systems with a nominal voltage of 425 V AC. The “-D4” designation typically indicates a specific sensitivity range and output configuration (e.g., a high sensitivity range often suitable for TT or TN systems with high earth impedance), and the “-4” often relates to the output signal type or other specific features. Its primary function is to detect incipient earth faults (leakage currents) at a very early stage, long before they develop into dangerous faults or cause damage. This allows for timely maintenance intervention, enhancing operational safety and preventing costly downtime.

It operates by measuring the earth leakage current via a sensor (often a Zero Sequence Current Transformer - ZSCT) installed around the power conductors. When the measured leakage current exceeds the set threshold, the monitor triggers an alarm or output signal.

2. Product Parameters (Typical for this type, refer to datasheet for exact values)

• Nominal Voltage (UL): 425 V AC

• System Type: Suitable for TT, TN, and IT systems (configuration depends on sensor type and application)

• Measuring Principle: Capacitive earth current measurement (for IT systems) or active earth current measurement (for TT/TN systems via ZSCT)

• Sensitivity Range (Typical for “-D4”): Often around 300 µA to 3 mA (adjustable, check datasheet for exact range)

• Response Time: Typically very fast, often in the range of milliseconds to a few seconds after exceeding the threshold

• Outputs:

• Alarm Relay: Normally open (NO) and/or normally closed (NC) contacts (e.g., 2 Form C relays)

• Current Output: Often 0/4…20 mA for connection to PLCs or SCADA systems

• Digital Communication: Some variants may include Modbus RTU or other protocols via an optional communication module

• Power Supply: Typically 85…264 V AC or 110…300 V AC (check specific model)

• Display: LED indicators for status (e.g., Power On, Alarm) and sometimes a digital display for measured value or settings

• Enclosure: Usually IEC Ex certified for hazardous areas (e.g., Ex d IIC T6) and IP65 rated for panel mounting

• Dimensions: Typically compact, DIN rail mountable (check datasheet for exact size)

• Temperature Range: Operates over a wide industrial temperature range (e.g., -25 °C to +60 °C)

3. Product Advantages

• High Sensitivity: Detects very small earth leakage currents (often in the µA range), enabling early fault detection before they escalate.

• Enhanced Safety: Provides critical protection against electric shock hazards by identifying insulation degradation.

• Preventive Maintenance: Allows for proactive maintenance scheduling based on detected leakage, preventing unexpected equipment failures and costly repairs.

• System Availability: Minimizes downtime by identifying and isolating potential faults early.

• Reliability: Known for robust construction and reliable operation in demanding industrial environments.

• Flexibility: Available in various configurations (sensitivity ranges, outputs) to suit different system requirements (TT, TN, IT).

• Compliance: Helps meet stringent international safety standards and regulations for electrical installations.

• Integration: Outputs can easily interface with control systems (PLCs, SCADA) for centralized monitoring and alarm management.

4. Precautions

• Correct Installation: Must be installed according to the manufacturer’s instructions and relevant electrical codes. Sensor placement (ZSCT) is critical for accurate measurement.

• Sensor Compatibility: Ensure the used Zero Sequence Current Transformer (ZSCT) is compatible with the ISOEV425-D4-4 monitor.

• Electrical Safety: Observe all electrical safety precautions during installation, commissioning, and maintenance. Disconnect power before accessing the device.

• Environmental Conditions: Install the device in an environment within its specified operating temperature and humidity range. Protect from excessive vibration, dust, and corrosive atmospheres.

• Calibration and Testing: Perform regular functional tests and calibration as recommended by the manufacturer to ensure continued accurate operation.

• Grounding: Ensure proper system grounding as per local regulations and system type (TT, TN, IT).

• Interference: Be aware of potential electromagnetic interference (EMI) and ensure proper shielding of cables if necessary.

• Qualified Personnel: Only qualified electricians or technicians should install, configure, and maintain the device.

5. Product Applications

The Bender ISOEV425-D4-4 is widely used in various industrial and commercial applications where reliable earth fault detection is crucial:

• Industrial Plants: Monitoring motors, pumps, conveyors, and other machinery.

• Commercial Buildings: Protecting electrical distribution systems in offices, shopping malls, hospitals, and hotels.

• Data Centers: Ensuring high reliability and safety of critical IT infrastructure power supplies.

• Water and Wastewater Treatment Plants: Monitoring pumps, valves, and control systems in potentially humid or corrosive environments.

• Oil and Gas Industry: Used in process control systems and hazardous area applications where safety is paramount.

• Chemical Plants: Protecting electrical installations in potentially explosive atmospheres.

• Marine and Offshore Installations: Reliable monitoring in challenging environments.

• Agriculture: Protecting farm machinery and building electrical systems.

• Renewable Energy: Monitoring power generation and distribution systems.

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