ISOMETER® isoLR275 with AGH-LR
- Ground-fault 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
- Ground-fault 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
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
- AMPPlus 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
ISOMETER® isoLR275 with AGH-LR Variant(s)
| Type | Nominal system voltage Un | Supply voltage US | Art. No. |
|---|---|---|---|
| isoLR275-327 + AGH-LR-3 consisting of: isoLR275-327 AGH-LR | 3(N) AC 0…793 V / DC 0…1100 V | AC 19,2…55 V / DC 19,2…72 V | B91065702W B91065700W B98039022W |
| isoLR275-335 + AGH-LR consisting of: isoLR275-335 AGH-LR-3 | 3(N)AC 0…793 V / DC 0…1100 V | AC 88…264 V / DC 77…286 V | B91065703W B91065701W B98039022W |