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
. Preventive fire and system protection
. Quick fault localisation through selective earth fault detection to L+ and L-
. Universal application in non-earthed AC, DC, AC/DC networks with up to 1000 V nominal voltage
. Suitable for large leakage capacitances up to 3000 μF
. Simplest setting via engaging rotary switches
. For monitoring photovoltaic system, also with thin-film technology
. Optimised measuring times - normally shorter than with known methods
. 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)

Features
. Insulation monitoring according to IEC/EN 61557-8
. Detection of symmetric and asymmetric insulation faults
. 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

Technical specifications
Width: 90mm
Approvals: UL
Enclosure design: Switch cabinet
IMD type: AC, DC, AC/DC
Nominal voltage IT system: AC 0 - 1000, DC 0 - 1000V
Response value type: Adjustable
Response value: 1 - 250kΩ
Earth fault indicator: Yes
Auxiliary voltage: DC
Connection for indicator: Yes
Classification: For photovoltaic systems
Type: LK 5896


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: LK5896.13/100/61 DC24V 1k-250k
Art. No.: 0065131