BENDER IRDH265 Insulation Monitoring and Debugging

4. Display TEST ALARM

System malfunction. Cut off the power supply briefly before powering it on. If it still displays after the response time, it may indicate a device malfunction and the manufacturer needs to be contacted.

5. Unable to reset after alarm

Short press the TEST/RESET button (<1s) to reset. If the LT terminal is bridged, the fault indication is stored and needs to be reset. If the fault persists, the device will sound an alarm again. Check the wiring of the external reset button.

6. Communication abnormality

RS-485 interface connected to A/B terminals, maximum cable length 1200m, protocol 9600 Baud, 1 start bit, 1 stop bit, 8 data bits. Check the terminal resistance, shielding, and polarity. Data is sent continuously and cannot be interrupted by other bus members.

7. Slow response to insulation faults in DC systems

Select UG/AMP or AMP/UG measurement principles and set Ian to the appropriate value. Pay attention to the direct connection of the DC circuit to the AC system, and the load current of the rectifier needs to be greater than 5... 10mA to be monitored correctly.

8. Fluctuations or inaccuracies in measurement values

Check if the system leakage capacitance exceeds the set CE MAX and adjust it if necessary. Confirm that the measurement principle matches the system type. Check for strong interference sources and ensure that wiring is kept away from power cables.

Maintenance and selection suggestions

Regular maintenance includes: functional testing every 6 months, using real ground faults or testing buttons; Check terminal fastening and wire insulation; Clean the surface of the equipment to avoid dust and moisture; Confirm the storage temperature of -40...+75 ° C and the operating temperature of -25...+70 ° C. Before resuming operation after a long-term shutdown, the basic settings and measurement principles should be checked.

When selecting, choose the model based on system voltage, frequency, leakage capacitance, and load type. The standard IRDH265-4 is powered by AC 230V and is panel mounted. If higher voltage is required, AGH coupling equipment can be selected. If external display is required, the 7204 or 9604 series k Ω measuring instruments can be selected. If a process control interface is required, an RK170 measurement converter can be equipped. For systems with a risk of DC faults, priority should be given to version -4, which supports a wider response range and CE MAX settings.