Measurements are carried out under the most severe conditions. Because power is supplied separate to the system, it is possible to monitor de-energised systems. Using a multi-voltage power supply unit, the devices can be operated with AC 110/230 Volt or DC 24 Volt voltages present in control cabinets. Two individually adjustable response alarm relays allow early warning long before the installation reaches a critical state.
If the insulation resistance exceeds the release value the alarm relays return to their initial position. Both the latest measured values and the alarm messages can be indicated on the LC display. Device parameters are assigned via the LC display, the control buttons on the front of the device or the RS-485 interface.
This compact device from the Bender-series is used in Photovoltaic IsoPV425. The Isometer only functional as a package with the related coupling device AGH420. Because the power supply is separate to the system being monitored, it is possible to monitor systems up to DC 1000 Volt and AC 690 Volt. IsoPV425 is specially designed for small and medium photovoltaic systems up to 500 Kilowatts.
The device is used in solar systems with directly connected inverters or with high system leakage capacitances as well as in photovoltaic systems with high but slow voltage variations. The two-module version with 36 millimetres plus coupling is extremely space-saving. The two devices which are connected using four wires can be mounted in different positions in the control cabinet or in different control cabinets.
