Insulation monitor
RN 5897/021

The insulation monitor RN 5897/021 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. Mains areas of applications are non-earthed DC charging stations for electric vehicles with mains voltages up to DC 1000 V. The adjustment of the setting values is simple and user friendly done on 2 rotary switches on the front of the device. Via display and LEDs the measured value, device parameters and device status are indicated easy to read. With a sealable transparent cover the device is protectet against manipulation. The RN 5987/021 has an additonal Modbus RTU-interface. All measured values, device states and parameters can be read out, set and parameterized. All functions available on the device can also be operated via Modbus.

Advantages
. Suitable for DC charging stations for electric vehicles acc. to IEC/EN 61851-23:2014/AC:2016-06
. Preventive fire and system protection
. 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 or RP 5898 for voltages up to AC 690 V / DC 1000 V
. Very fast reaction time ≤ 1 s
. Optimised insulation resistance monitoring also during mains voltage variation
. Self-test every full operating hours
. Easy adjustment of response values and setting parameter via rotational switch and menu display or via Modbus RTU-interface
. Suitable for large leakage capacitances up to 5 μF
. 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

Features
. Insulation monitoring according to IEC/EN 61557-8
. 2 separate adjustable response thresholds (using e.g. for pre-alarm and Alarm)
. Setting range of 1st response value (Pre-alarm): 1 kΩ … 500 kΩ
. Setting range of 2nd response value (alarm): 1 kΩ … 500 kΩ
. Energized or de-energized on trip can be selected for indicator relay
. Display for indication of measured value, device parameters and device status
. Automatic and manual device self-test
. Alarm storage selectable
. Protection against manipulation by sealable transparent cover
. External control input for combined test- / reset-button with additional Stop of the measuring function
. 2 wide voltage input for auxiliary voltage
. Width 52.5 mm

Technical specifications
Width: 52,5mm
Approvals: UL
Enclosure design: Distribution board
IMD type: AC, DC, AC/DC
Nominal voltage IT system: AC 0 - 690 (Coupling device), DC 0 - 1000 (Coupling device), AC 0 - 230, DC 0 - 230V
Response value type: Adjustable
Response value: 1 - 500kΩ
Earth fault indicator: Yes
Bus interface: Modbus RTU
Auxiliary voltage: AC/DC
Classification: For DC charging stations
Type: RN 5897/021


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: RN5897.12/021/61 AC/DC24-60V
Art. No.: 0069252