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BENDER GmbH & Co KG
ISOMETER® IR155-4203/IR155-4204

ISOMETER® IR155-4203/IR155-4204

Product catalog summary

Device Overview
The ISOMETER® IR155-4203/IR155-4204 is an insulation monitoring device (IMD) designed for unearthed DC drive systems (IT systems) in electric vehicles. It is suitable for 12 V and 24 V systems and features automatic self-testing, continuous insulation resistance measurement, and earth fault detection.

Specifications
- Insulation resistance measurement range: 0 to 10 MΩ
- Response time: < 2 s for initial system state measurement, < 20 s for insulation resistance measurement
- System leakage capacitance adaptation: ≤ 1 μF
- Voltage range: AC 0 to 1000 V, DC 0 to 1000 V
- Undervoltage detection: Adjustable below 500 V
- Short-circuit proof outputs for fault detection and measured value/status

Functionality
The device uses a pulsed measuring voltage to monitor insulation conditions on both DC and AC sides of the drive system. It provides fault messages through a galvanically isolated interface, distinguishing between different fault types using frequency encoding.

Standards and Compliance
The device complies with several standards, including IEC 61557-8, IEC 61010-1, and ISO 6469-3, among others. It has undergone automotive test procedures to meet ISO16750-x requirements.

Technical Data
- Supply voltage: DC 10 to 36 V
- Max operating current: 150 mA
- Power consumption: < 2 W
- Measuring voltage: ±40 V
- Measuring current: ±33 µA
- Impedance at 50 Hz: ≥ 1.2 MΩ

Output and Interface
The device provides measurement and status outputs with PWM signals indicating various conditions such as normal operation, undervoltage, device error, and earth connection faults.

Installation and Mounting
The device should be mounted using M4 metal screws with specific torque requirements. It requires sufficient insulation from the vehicle or mounting points.

Ordering Information
Available configurations include different response values and undervoltage detection settings. Accessories such as fastening and connector sets are available.

Catalog excerpts

ISOMETER® IR155-4203/IR155-4204 Insulation monitoring device (IMD) for unearthed DC drive systems (IT systems) in electric vehicles Version V004

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ISOMETER® IR155-4203/IR155-4204 Insulation monitoring device (IMD) for unearthed DC drive systems (IT systems) in electric vehicles Device features • Automatic device self test • Continuous measurement of the insulation resistance 0...10 MO - Response time for the first measurement of the system state (SST) is < 2 s after switching the supply voltage on - Response time < 20 s for insulation resistance measurement (DCP) • Automatic adaptation to the existing system leakage capacitance (< 1 pF) • Detection of earth faults and interruption of the earth connection • Insulation monitoring of AC and...

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Wiring diagrams

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Technical data Insulation coordination acc. to IEC 60664-1 Protective separation (reinforced insulation) between (L+/L-) – (Kl. 31, Kl. 15, E, KE, MHS, MLS, OKHS) Voltage test AC 3500 V/1 min Supply/IT system being monitored Supply voltage US Max. operating current IS Max. current Ik Power consumption DC 10…36 V 150 mA 2A 6 A/2 ms inrush current AC 0…1000 V (peak value) 0…660 V r.m.s. (10 Hz…1 kHz) DC 0…1000 V <2W Response values Response value hysteresis (DCP) Response value Ran Undervoltage detection Measuring range Measuring range 0…10 MΩ Undervoltage detection 0…500 V default setting: 0 V...

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(external pull-down resistor to Kl. 31 necessary 2.2 kQ) (external pull-up resistor to Kl. 15 reqired 2.2 kQ 10 Hz ► Normal condition Insulation measurement DCP; starts two seconds after power on; First successful insulation measurement at < 17.5 s PWM active 5...95 % Operating principle PWM driver Condition “SST” (30 Hz) Duty cycle ► 5.10 % (“good” 90.95 % (“bad” 20 Hz ► undervoltage condition Insulation measurement DCP (continuous measurement); starts two seconds after power on; PWM active 5.95 % First successful insulation measurement at < 17.5 s Undervoltage detection 0.500 V (Bender configurable)...

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General data Necessary crimping tool (Molex) Necessary crimping tool 20 - 30 AWG (Samtec) Operating mode/mounting continuous operation/any position Dimension diagram Dimensions in mm Temperature range Voltage failure Mounting M4 metal screws with locking washers between screw head and PCB. Torx, T20 with a maximum tightening torque of 4 Nm for the screws. Furthermore, a maximum of 10 Nm tightening torque to the PCB at the mounting points. Mounting and connector kits are not included in delivery, but are available as accessories. The maximum diameter of the mounting points is 10 mm. Before mounting...

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