BENDER ISOMETER® iso685(W)-D/-S Insulation Monitoring Device

BENDER ISOMETER® iso685(W)-D/-S Insulation Monitoring Device

Product Overview

ISOMETER ®  Iso685 (W) - D/- S is a professional insulation monitoring equipment developed by Bender, a German company, specifically designed for IT systems (ungrounded AC/DC systems). Its core mission is to detect insulation faults in a timely manner by monitoring key parameters such as insulation resistance and DC offset voltage, avoiding risks such as electric shock and equipment damage. The product is divided into two variants: D-type (integrated graphic LC display and operation buttons) and S-type (no display/buttons, required to be used with FP200 (W) front-end panel), both supporting AC/DC/3 (N) AC system monitoring. With coupling equipment, the rated voltage monitoring range can be extended to 12 kV, meeting the needs of industrial scenarios with different voltage levels.

The product complies with international standards such as IEC 61557-8 and DIN EN 61557-8, and has high reliability and anti-interference ability. It is suitable for various scenarios such as industrial production lines, emergency power supply systems, and ship power, and is one of the core equipment to ensure the safe operation of the power system.

Core functions and features

（1） Monitoring and measurement functions

Insulation resistance monitoring

Measurement range: 0.1 k Ω~20 M Ω, alarm response value can be independently set within 1 k Ω~10 M Ω (ALARM1/ALARM2).

Preset response values: Factory default ALARM1=40 k Ω, ALARM2=10 k Ω, supports custom adjustment.

Measurement accuracy: ± 15% (minimum ± 1 k Ω), in accordance with the requirements of IEC 61557-8 standard.

Dual alarm mechanism: When the insulation resistance is lower than the corresponding response value, the relay action and LED indication are triggered, supporting fault memory (maintaining the alarm state until manual reset).

Multi parameter collaborative monitoring

DC offset voltage monitoring: A DC alarm threshold of 20 V~1 kV can be set to avoid the impact of DC components on the system.

System leakage capacitance monitoring: measurement range 0~1000 μ F, accuracy ± 10% (minimum ± 10 μ F), equipment automatically adapts to capacitance changes.

Connection monitoring: Real time monitoring of the connection status of the measurement line to avoid monitoring failure caused by line disconnection.

The multi measurement profile adaptation device provides 7 measurement profiles, which can be flexibly selected according to the system type to optimize measurement speed and accuracy:

Profile type applicable scenario key parameters

Power circuits - Conventional constant frequency systems with voltages ranging from 0 to 690 V (AC)/0 to 1000 V (DC) and capacitors ranging from 0 to 150 μ F

Control circuits: Low voltage sensitive control system measures voltage ± 10 V, voltage 0-230 V (AC/DC)

Generator monitoring rapid measurement, frequency 50-60 Hz, capacitance 0-5 μ F

High capacitance systems such as ships have a capacitance of 0~1000 μ F and a voltage of 0~690 V (AC)/0~1000 V (DC)

Variable frequency converter>10 Hz (inverter>10 Hz) 10~460 Hz Variable frequency system capacitance 0~20 μ F, voltage 0~690 V (AC)/0~1000 V (DC)

Frequency converter<10 Hz (inverter<10 Hz) 0.1~10 Hz Low frequency system capacitance 0~20 μ F, voltage 0~690 V (AC)/0~1000 V (DC)

Customer specific special needs scenarios are defaulted to be consistent with the power circuit profile and support Bender customization

（2） Display and storage functions

Graphic display: equipped with a 127 × 127 pixel graphic LC display screen, real-time display of insulation resistance, alarm status, signal quality and other information, supporting multilingual switching (including English, German, etc.).

Historical memory: It can store 1023 alarm/fault information, each record containing date, time, fault type, and measurement value, and data will not be lost after power failure (continuous fault memory mode).

Trend analysis: The isoGraph function can graphically display the insulation resistance change trends for 1 hour, 1 day, 1 week, 1 month, and 1 year, facilitating fault tracing and system status prediction.

（3） Communication and Control Interface

The device supports multiple communication methods to achieve local and remote control:

Interface type communication protocol/functional key parameters

Ethernet (ETH) Modbus TCP, BCOM, Web Server 10/100 Mbit/s, supports DHCP/static IP, up to 5 TCP connections

RS-485 (X1 interface) BS bus, Modbus RTU, isoData baud rate 9.6 kBd~115 kBd, transmission distance ≤ 1200 m

X1 multifunctional I/O digital input (3 channels), digital output (2 channels), analog output (1 channel), analog output supports signals such as 0~20 mA/4~20 mA/0~10 V, etc

Relay output 2 conversion contacts (K1/K2) support N/C/N/O mode, AC-13 class 230 V/5 A, electrical life 10000 times

（4） Safety and operational assurance

Safety protection: Terminal protection level IP20 (external)/IP30 (internal components), shell flame retardant level UL94 V-0, with overvoltage and overcurrent protection.

Operation protection: Supports 4-digit password protection (0000~9999) to prevent unauthorized parameter modification; Continuous self-test function, automatically detects internal circuits, measurement circuits, and connection status after startup.