Insulation monitor RN 5897/311

The insulation monitor RN 5897/ 311 of the VARIMETER IMD family is a solution for optimal insulation monitoring of modern IT systems. The device can be used in the most flexible way for AC, DC and AC/DC systems even with large leakage capacity to earth (PE). The setting of the parameters and the switching values is done via Modbus. All measured values, device statuses and parameters can also be read out via Modbus. All functions of the device can also be operated via Modbus. The operating status is indicated user friendly via a multicolour LED. With a sealable transparent cover the device is protected against manipulation.

Advantages and Features:​

• Insulation monitoring according to IEC/EN 61557-8​
• Detection of symmetric and asymmetric insulation faults​
• Quick fault localisation through selective earth fault detection to L+ and L-​
• Universal application in non-earthed AC, DC, AC/DC networks up to AC max. 250 V or DC max. 300 V​
• With connection facility of an external coupling device:​
  • RL 5898 for voltages up to AC 400 V / DC 500 V​
  • RP 5898 for voltages up to AC 690 V / DC 1000 V​
  • RR 5898 for voltages up to AC 1000 V / DC 1500 V​
• Easy adjustment of response values and setting parameter via Modbus RTU-interface​
• Suitable for large leakage capacitances up to 1000 μF​
• Optimised reaction time for large leakage capacitances​
• Extended operating temperature range: -40 … +70 °C​
• Monitoring also with voltage-free mains​
• Measuring circuit L(+)/L(-) with broken wire detection (can be switched off)​
• Protective conductor PE1/PE2 with broken wire detection (can’t be switched off)​
• 2 changeover contacts each for insulation failures-Pre-alarm and –alarm each galvanically isolated​
• With galvanic separated Modbus RTU interface​
• Trigger output for insulation fault locating system​
• 2 separate adjustable response thresholds (using e.g. for pre-Alarm and Alarm)​
• Setting range of 1st response value (Pre-Alarm): 1 kΩ … 2 MΩ​
• Setting range of 2nd response value (Alarm): 1 kΩ … 2 MΩ​
• 2 changeover contacts for insulation failures –Pre-Alarm and –Alarm​
• Energized or de-energized on trip can be selected for indicator relay​
• Setting the maximum leakage capacitance to shorten the response time​
• Automatic and manual device self-test​
• Alarm storage selectable​
• Protection against manipulation by sealable transparent cover​
• External control input for combined Test-/Reset-button​
• 2 wide voltage input for auxiliary voltage​
• Width 52.5 mm