ISOMETER® isoLR275 with AGH-LR

Insulation monitoring device for AC and DC IT systems
Application main circuits with low-resistance insulation level
Separately adjustable response values 200 Ω…100 kΩ
Isometer disconnecting relay for the operation of several ISOMETER® in interconnected IT systems
History memory with real-time clock for storing alarm messages with date and time

The isoLR275 ISOMETER® in conjunction with the AGH-LR coupling device monitors the insulation resistance of IT systems. It is suitable for universal use in 3(N) AC, AC/DC and DC systems. AC systems may include extensive DC-supplied loads, such as converters or thyristor-controlled DC drives. The adaptation to the existing system leakage capacitances takes place automatically.

Only use the AGH-LR coupling device supplied with the device for adaptation of the nominal voltage range.

isoLR275 can share the BMS bus with other bus devices

Questions? Contact us!

Insulation monitoring device for AC and DC IT systems
Application main circuits with low-resistance insulation level
Separately adjustable response values 200 Ω…100 kΩ
Isometer disconnecting relay for the operation of several ISOMETER® in interconnected IT systems
History memory with real-time clock for storing alarm messages with date and time

The isoLR275 ISOMETER® in conjunction with the AGH-LR coupling device monitors the insulation resistance of IT systems. It is suitable for universal use in 3(N) AC, AC/DC and DC systems. AC systems may include extensive DC-supplied loads, such as converters or thyristor-controlled DC drives. The adaptation to the existing system leakage capacitances takes place automatically.

Only use the AGH-LR coupling device supplied with the device for adaptation of the nominal voltage range.

isoLR275 can share the BMS bus with other bus devices

Questions? Contact us!

Features

isoLR275

ISOMETER® for IT AC systems with galvanically connected rectifiers or converters and for IT DC systems (IT = unearthed systems)
Particularly suited for monitoring electrical installations with a low level of resistance
isoLR275 is always operated in conjunction with AGH-LR
Automatic adaptation to the existing system leakage capacitance
AMP^Plus measurement method (European Patent: EP 0 654 673 B1)
Choice of measurement methods to meet different requirements
Two separately adjustable response ranges of 0.2 kΩ…100 kΩ each (Alarm 1, Alarm 2)
Two-line LC display
Automatic device self test
Memory with real-time clock to store alarm messages with date and time stamp
BMS interface (Bender Measuring Device Interface) for communication with other Bender devices (RS-485 galvanically isolated)
Internal disconnection of the ISOMETER® from the IT system to be monitored (via control signal; terminals F1/F2), e.g. if several ISOMETER®s are interconnected
Current output 0(4…20 mA (electrically isolated) in relation to the insulation value measured in the system

AGH-LR

Coupling device required for ISOMETER® isoLR275
Nominal voltage range AC 0…793 V and DC 0…1100 V
DIN rail mounting

Applications

AC, DC or AC/DC main circuits
IT systems with directly connected inverters
IT systems with high system leakage capacitances of up to 500 μF
IT systems with high but slow voltage fluctuations
Systems including switched-mode power supplies
Coupled IT systems