VARIMETER IMD Insulation monitor RN 5897 Insulation monitoring for modern IT systems The demand for the availability of machines and apparatus in the region of factory machinery and process technology is constantly increasing. The requirement for this is a functioning and reliable power supply. Unexpected insulation faults in the system can lead to unwanted power supply failures, and even cause personal injury or property damage. This is why insulation monitoring equipment is typically used in IT systems. The insulation monitor RN 5897 from the VARIMETER IMD series by DOLD was developed especially for use with modern power supplies. These are often comprised of converters, thyristor regulators, and direct current components.Through EMV interference suppression measures, high leakage capacitance onto the ground is present. The RN 5897 is suited for system leakage capacitances of up to 1000 μF, and for voltages up to AC/DC 300 V. Using the additional ballast unit RP 5898, it is possible to install the unit in systems with voltages of up to AC 760 V and DC 1000 V. Besides an adjustable alarm threshold, the insulation monitor also has an adjustable pre-alarm threshold. A multicoloured LCD screen constantly updates stating the current insulation value.The insulation monitors guarantee additional surveillance over current-free networks. A selective earth fault detection of L+ and L- enables quick fault localisation. Advantages and customer benefit Recognition of symmetrical and asymmetrical insulation faults Quick error localization through selective earth fault detection based on L+ und LPreventive fire and plant protection Multi-color display to show the insulation value Universal use in ungrounded AC-, DC- and AC/DC networks Suitable for system leakage capacitance of up to 1000 μF Easy to adjust parameters with a rotary dial and menu organization

Insulation monitor RN 5897 Technical features Order information Insulation monitoring in accordance with IEC/EN 61557-8 Standard type RN 5897/010 with option to connect an external ballast unit RP 5898 for voltages up to AC 760 V, DC 1000 V 2 separated, adjustable response thresholds (e.g. can be used for pre-alarm and alarm) Adjustment range 1. Response value (pre-alarm): 20 kΩ … 2 MΩ 2. Response value (alarm): 1 kΩ … 250 kΩ 1 changeover each for insulation fault pre-alarm and insulation fault alarm Load or closed current principle adjustable for signaling relay Multi-colored display to show...