BENDER ISOMETER ® IRDH265/365 series Insulation Monitoring Equipment

BENDER ISOMETER ®  IRDH265/365 series Insulation Monitoring Equipment

Core positioning and adaptation scope of the product

Core application: Real time monitoring of insulation resistance in IT systems (ungrounded systems), triggering graded alarms when insulation resistance is below the set response value, ensuring electrical system safety, suitable for complex power supply scenarios containing rectifiers, converters, thyristor controlled DC drivers, and other components.

Adaptation system type:

Basic adaptation: IT communication system (3AC, 3 (N) AC, single-phase AC), IT DC system

Special adaptation: IT AC systems with direct connection to DC circuits (such as AC systems with DC loads)

Voltage parameters:

Rated monitoring voltage: AC 0... 793V (frequency 50... 400Hz), DC 0... 650V (slightly different models, such as -7 series DC maximum 750V)

Extended monitoring voltage: Through coupling devices, AGH204S-4 supports AC 0... 1650V, AGH520S supports AC 0... 7200V, AGH150W-4 supports DC 0... 1760V

Power supply voltage: Multiple specifications are available, as shown in the table below:

Power type, voltage range, applicable model examples

AC power supply 230V IRDH265-4, IRDH365-4

AC power supply 90... 132V IRDH265-413, IRDH365-413

AC power supply 400V IRDH265-415, IRDH365-415

AC power supply 500V IRDH265-416, IRDH365-416

DC power supply 19.2... 84V IRDH265-422, IRDH365-422

DC power supply 77... 286V IRDH265-423, IRDH365-423

Model differentiation and mechanical specifications

Model installation method, shell type, panel opening size (mm), weight, protection level

IRDH265 DIN rail installation (DIN EN 50022) or screw installation (accessory 990056 required) XM112- approximately 825g enclosure IP30, terminal IP20

IRDH365 Embedded Installation X300 138 × 66 Approximately 1075g Shell IP30, Terminal IP20

Core technology and functional characteristics

Measurement principle (Level 4 optional):

AMP measurement principle (default): superimposed pulsating AC measurement voltage (peak value 27V), suitable for AC/DC hybrid systems, measuring a maximum current of 230 μ A

DC measurement principle: Overlay 27V DC measurement voltage, only applicable to pure AC systems

UG/AMP measurement principle: Passive asymmetric measurement, only applicable to DC systems, supports DC fast response

AMP/UG measurement principle: AMP measurement+asymmetric measurement superposition, dual alarm channels respectively feedback different types of faults

Core functions:

Insulation monitoring: dual stage adjustable response value, hysteresis of about 25%, supports AC/DC fault differentiation alarm (can be set to only AC, only DC, only DC+/- and other modes)

Automatic adaptation: The system automatically adapts to leakage capacitance, with a maximum adaptation of 500 μ F for the -3/-4 series and 2 μ F for the -7/-8 series

Self testing and monitoring:

Automatic self-test: Automatically executed every 24 hours (-3/-4 series), requiring the alarm relay to be set to system fault alarm mode

Manual self-test: Press and hold the TEST button (>2s) to start, displaying "TEST OK" or "TEST ALARM"

Connection monitoring: Continuously monitor the connection status between the system and PE, and display "ALARM E-KE" or "ALARM L1-L3" (-3/-4 series) when disconnected

Alarm function:

Output: 2 conversion contact relays, supporting N/O (default) or N/C operation modes, rated contact voltage AC 250V/DC 300V, maximum switching current 5A

Indication: 2 alarm LEDs (ALARM1/ALARM2), supporting flashing function (1Hz), K1/K2 can be set to flash separately or simultaneously

Fault storage: When short circuiting the LT terminal, store the fault and press the RESET button (<1s) to clear it

Configuration function:

Third level menu: Setup 1 (basic functions: response value, relay mode), Setup 2 (extended functions: alarm type, coupling device, password protection, etc.), Setup 3 (measurement principle selection)

Password protection: Can activate password (2 letters) to prevent unauthorized modification of parameters

Time delay: Supports 1... 10s alarm delay (only -3/-4 series)

Interface function:

RS-485 interface: no electrical isolation, transmission protocol 9600 Baud (1 start bit+8 data bits+1 stop bit), maximum transmission distance 1200m

External indication: The M+/M - terminals support external k Ω measuring instruments (0... 400 μ A output) and require galvanic isolation

Key performance parameters

Specific parameters of performance category

Response time CE=1 μ F is about 8 seconds; under asymmetric measurement principle, the response time for direct grounding faults is less than 1 second

Measurement accuracy response range: 10k Ω... 990k Ω (-3/-4 series), 0.2M Ω... 20M Ω (-7 series), 0.5M Ω... 30M Ω (-8 series)

Environmental adaptability working temperature: -10...+55 ℃ (when the temperature is>40 ℃, a 10mm ventilation gap needs to be reserved); Storage temperature: -40...+70 ℃ (T option model storage temperature -45...+85 ℃)

Anti interference and mechanical performance impact resistance: 15g/11ms (standard), 30g/11ms (T option); Vibration resistance: 10... 150Hz/0.15mm-2g (standard); Electromagnetic compatibility complies with EN 50082-2 and EN 50081

Model classification and ordering information

Standard Model (Core Series): | Series | Model | Example Model | Order Number Example|

|-4 Series (Mainstream) | IRDH265 | IRDH265-4 | B91068001|

|-4 Series | IRDH365 | IRDH365-4 | B91068006|

|-3 Series (Special Response Range) | IRDH265 | IRDH265-3 | B91068008|

|-7 series (high impedance response) | IRDH265 | IRDH265-7 | B91068034|

|-8 series (ultra-high impedance response) | IRDH265 | IRDH265-8 | B91069003|

Special options and accompanying components:

T option: Enhance shock and vibration resistance performance, with a "T" at the end of the model (such as IRDH265T-4921)

Coupling device:

Model adaptation voltage range Order number

AGH204S-4 AC 0…1650V B914013

AGH520S AC 0…7200V B913033

AGH150W-4 DC 0…1760V B98018006

External measuring instrument:

Model Size (mm) Compatible Series Order Number

7204-1421 72 × 72-4 series B986763

9604-1311 96 × 96-3 series B986753

7204S-1421 72 × 72-4 series (anti impact vibration) B986804

Compliance Standards and Certification

International standards: IEC 61557-8 (1997-02), ASTM F25.10.11

Certification: UL certification (IND.CONT.EQ., 12PA), CE certification

Electromagnetic compatibility: EN 50082-2 (anti-interference), EN 55011/CISPR11 (emission, Class A）