Catalog excerpts
VARIMETER IMD Insulation Monitor LK 5895 / LK 5896 With the new Insulation Monitors LK 5895 and LK 5896 from the VARIMETER IMD family, DOLD offers a convincing solution for insulation monitoring of non-earthed AC, AC/ DC, and DC power supplies (IT systems). The devices increase the availability of plants and are used for preventive maintenance and repair. Faults are detected even during operation and costly plant standstills are prevented. The insulation monitors were specially designed for use in modern power supplies that often include rectifiers, converters, thyristor controllers or directly connected DC components. EMC interference suppression with its leakage capacitances against earth plays an important role in this matter. The two insulation monitors meet these requirements. Besides a faster fault localisation by selective earth fault detection and optimised measuring times, the insulation monitors can deal with system leakage capacitances of up to 3000 µF. They are also universally applicable in non-earthed DC/AC and mixed networks from 0 V to 1000 V nominal voltage. The maximum voltage is up to DC 1500 V and AC 1100 V without additional adaption device. An additional measurement circuit allows simultaneous monitoring of an AC network which is galvanically isolated from the main measurement circuit. Universal analogue outputs for the insulation resistance output complete the device's functionality. Advantages and customer benefit Preventive fire and plant protection Early insulation fault detection during operation No additional adaption device needed Fast error localisation via selective earth fault detection to L+ and L Suitable for universal application in non-earthed DC/AC and mixed networks Suitable for large-scale system leakage capacitances up to 3000 μF Simple adjustment via latching rotary switches Reliable monitoring, also in voltage-free network LK 5896 with additional measurement circuit
Open the catalog to page 1Insulation Monitor LK 5895 / LK 5896 Technical features Order information Insulation monitoring in accordance with IEC/EN 61557-8 Detection of symmetrical and asymmetrical insulation faults Measurement circuits can be switched off via control terminals, e.g. in case of network connection 1 changeover contact each for prewarning and alarm 3. Output relay to indicate broken wire and device faults Max. voltage up to DC 1500 V and AC 1100 V Adjustment range prewarning threshold: 20 kΩ ... 2 MΩ Adjustment range alarm threshold: 1 kΩ ... 250 kΩ Open circuit or closed circuit principle selectable...
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