Insulation monitor LK 5896

The insulation monitor LK 5896 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 adjustment of the setting values is simple and user friendly done on 2 rotary switches on the front of the device. Via LEDs the measured value, device parameters and device status are indicated easy to read. The unit has 3 relay contacts to signal Insulation and device failures. The analogue output provides a voltage and current signal proportional to the actual insulation resistance, which can be connected to a superior control (plc), another system or external display unit. In addition the LK 5896 provides a second measuring circuit that can be used to monitor an inverter on the AC side also when the inverter is disconnected.

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 1000 V nominal voltage​
• Easy adjustment of response values and setting parameter via rotational switches​
• Suitable for large leakage capacitances up to 3000 μF​
• Optimised measuring times – normally shorter than with known methods​
• For monitoring photovoltaic system, also with thin-film technology​
• Monitoring also with voltage-free mains​
• Additional measuring circuit allows AC output monitoring even with the inverter switched off, e.g. with hybrid vehicles​
• Measuring circuit with broken wire detection ​
• No additional coupling device required​
• Trigger output for insulation fault locating system​
• Analogue output for value of the insulation resistance: 0 … 10 V / 0 … 20 mA (2 … 10 V / 4 … 20 mA)​
• Measuring circuits can be disconnected via control terminals, e.g. for mains couplings​
• 1 changeover contact each for prewarning and alarm​
• 3. output relay for signalling wire break and device faults​
• Prewarning threshold setting range: 20 kΩ … 2 MΩ​
• Alarm threshold setting range: 1 kΩ … 250 kΩ​
• Energized or de-energized on trip can be selected for output relay​
• Setting the maximum leakage capacitance to shorten the response time​
• Simple, clearly arranged adjustment of the device with screwdriver​
• LED chain to indicate the current insulation resistance​
• Display of active measuring circuits​
• Automatic and manual device self-test​
• Alarm storage selectable​
• External test and reset pushbutton can be connected​
• Width: 90 mm