DOLD VARIMETER IMD Series Manual

Monitoring Technique
VARIMETER IMD
Insulation monitor
RN 5897/021
RN 5897/021
Product Description
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.
Function Diagram
U H
R
E
Earth fault
R
pA
R
A
Hysteresis function
21-24
Open circuit operation
21-22
21-24
De-energized on trip
21-22
11-14
Open circuit operation
11-12
11-14
De-energized on trip
11-12
Manual reset
Reset
21-24
Open circuit operation
21-22
21-24
De-energized on trip
21-22
11-14
Open circuit operation
11-12
11-14
De-energized on trip
11-12
All Technical Data in this list relate to the state at the moment of edition. We reserve the right
for technical improvements and changes at any time.
Coupling devices
RL 5898 RP 5898
M11593
of the original instructions
Your 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
t
• Width 52.5 mm
Approvals and Markings
t
Canada / USA
Applications
Insulation monitoring of:
• Non-earthed AC, DC, AC/DC networks
• UPS systems
• Networks with frequency inverters
• Battery networks
• Networks with direct current drives
• Hybrid and battery-powered vehicles
• Mobile generator sets
• DC charging stations for electric vehicles
1
Translation
AC/DC
24.01.24 en / 841A