BENDER VMD420-D-1 Insulation monitoring device

BENDER VMD420-D-1 Overview

The BENDER VMD420-D-1 is an insulation monitoring device (IMD) for monitoring the insulation resistance of unearthed AC and DC systems (IT systems). It is designed for the early detection of insulation faults, thereby increasing the safety, reliability, and availability of electrical systems.

Product Detailed Description

• Function:

• Continuously monitors the insulation resistance of unearthed AC and DC systems.

• Issues an alarm signal when the insulation resistance falls below the adjustable alarm thresholds.

• Provides two separate alarm thresholds for pre-warning and alarm.

• Features a self-test function to periodically check its own functionality.

• Configurable fault memory function.

• Communication via Modbus RTU interface for easy integration into monitoring systems.

• Suitable for main and standby power supply systems.

• Features:

• Suitable for AC and DC IT systems.

• Adjustable alarm thresholds (Ralarm1, Ralarm2).

• Two separate alarm relay outputs.

• Configurable alarm response behavior.

• Test current generator for fault location (connectable to Bender EDS systems for fault location).

• Communication via Modbus RTU.

• DIN rail mounting.

• Compact design.

Product Parameters

• System Voltage (Un):

• AC/DC 0...500 V

• Response Range (Rn):

• 1 kΩ...10 MΩ

• Alarm Threshold (Ralarm1):

• Adjustable, 1 kΩ...1 MΩ

• Alarm Threshold (Ralarm2):

• Adjustable, 1 kΩ...1 MΩ

• Measuring Voltage (Um):

• DC ≤ 9 V

• Measuring Current (Im):

• ≤ 1 mA

• Alarm Relays:

• 2 changeover contacts (CO), AC 250 V / 3 A, DC 30 V / 3 A

• Communication Interface:

• Modbus RTU

• Degree of Protection:

• IP20

• Ambient Temperature:

• -25 °C ... +70 °C

• Connection Type:

• Screw terminals

• Mounting Method:

• DIN rail

• Dimensions (H x W x D):

• 96 x 90 x 71 mm

• Standards Compliance:

• IEC 61557-8

Product Advantages

• Early Fault Detection:

• Provides timely warnings before insulation faults lead to system downtime or safety issues.

• Increased System Availability:

• Reduces unexpected downtime through preventative maintenance.

• Enhanced Safety:

• Lowers the risk of electric shock and fire hazards.

• Easy Integration:

• Easily integrated into monitoring and management systems via the Modbus RTU interface.

• Flexible Configuration:

• Adjustable alarm thresholds and response behavior to suit different application requirements.

• High Reliability:

• Bender is an expert in insulation monitoring, ensuring reliable product quality.

• Fault Location Capability:

• Can be used with Bender EDS systems for fast and accurate fault location, reducing repair times.

Precautions

• Correct Selection:

• Choose the appropriate model based on the system voltage and insulation requirements.

• Correct Installation:

• Follow Bender's installation manual to ensure correct and secure connections.

• Parameter Setting:

• Set appropriate alarm thresholds and other parameters according to the specific requirements of the system.

• Regular Testing:

• Periodically test the functionality of the device to ensure its reliable operation.

• Compliance with Standards:

• Installation and use should comply with relevant electrical safety standards and regulations.

• Operation by Qualified Personnel:

• Installation, commissioning, and maintenance of the device should be performed by qualified professionals.

Product Applications

The BENDER VMD420-D-1 insulation monitoring device is widely used in various unearthed AC and DC systems, including:

• Industrial Control Systems:

• Automation equipment, production lines.

• Medical Equipment:

• Power supply systems in operating rooms and intensive care units.

• Transportation Systems:

• Electrical systems in railway vehicles, ships, and aircraft.

• Uninterruptible Power Supply (UPS) Systems.

• Photovoltaic (PV) Systems.

• Mobile Power Supply Systems.

• Special Application Areas such as Mining and Chemical Industries.

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