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Bender AGH420 User Manual

Bender AGH420
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Manual
EN
isoEV425_D00126_09_M_XXEN/03.2019
ISOMETER® isoEV425/
isoEV425HC
with AGH420 coupling device
Insulation monitoring device for unearthed
DC circuits (IT systems)
for the charging of electric vehicles
Software version: D0430 V2.xx/D0640 V2.xx (isoEV425)
D0586 V2.xx (isoEV425HC)

Table of Contents

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Bender AGH420 Specifications

General IconGeneral
BrandBender
ModelAGH420
CategoryMeasuring Instruments
LanguageEnglish

Summary

Important information

Danger symbols

Explanation of danger symbols (DANGER, WARNING, CAUTION) and their meanings.

First level support

Details for contacting first-level technical support via phone or email.

Safety instructions

Intended use

Description of the device's intended application and operational limits.

Work activities on electrical installations

Rules for skilled persons performing work on electrical installations.

Risk of electrocution due to electric shock

Warning about the risk of electric shock and necessary precautions.

Function

Device characteristics

Key features and technical specifications of the device.

Functional description

Detailed explanation of how the device functions and its monitoring capabilities.

Monitoring the insulation resistance

Explanation of how insulation resistance is monitored and alarm conditions.

Self test/error codes

Information about the device's self-test feature and error code meanings.

Signalling assignment of the alarm relays K1/K2

How alarms are assigned to relays and LED indicators.

Undervoltage/overvoltage monitoring

Description of the voltage monitoring functions and alarm triggers.

Installation, connection and commissioning

Wiring diagram

Visual representation of the device's electrical connections.

Commissioning

Steps to follow for commissioning the device after installation.

Danger from touching hot surfaces!

Warning about hot surfaces and precautions when the device is energized.

Data access using the Modbus RTU protocol

Reading out the Modbus register from the ISOMETER®

How to read data from the device using Modbus registers.

Writing to Modbus registers (parameter setting)

How to write parameters to the device using Modbus registers.

ISOMETER® answers the Master

Example of a Modbus response after a write command.

Master sends a command to the ISOMETER®

Example of a Modbus write request from master to device.

Modbus register assignment of the ISOMETER®

ISOMETER® device-specific data type

Details on the specific data types and formats used by the device.

IsoData data string

Data string format and content

Description of the IsoData string structure and the meaning of its components.

Operation of the device

Display elements

Description of the device's front panel display and indicators.

Menu structure

Overview of the device's menu system and navigation.

Menu "AL"

Menu for querying and setting response values like resistance and voltage limits.

Menu "out"

Menu for configuring fault memory, alarm relays, and interfaces.

Response value setting

Detailed configuration of response values for alarms and pre-alarms.

Relay alarm assignment "r1" and "r2" and LED assignment

Assigning alarms to relays and configuring LED indicators.

Interface configuration

Settings for communication interfaces like BMS, Modbus, and IsoData.

Time configuration

Setting up start-up delay, response delay, and delay on release.

Function configuration

Configuring password, system connection test, and device test.

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