Device overview

The device is a digital insulation monitoring device (IMD) for low-voltage and medium-voltage ungrounded power systems. The device monitors the insulation of a power system and notifies any insulation faults as soon as they occur.

IMD applies low-frequency AC voltage between the power system and the ground to provide accurate insulation monitoring in complex applications. The insulation is then assessed on the basis of the current value returned. This method is used for all power system types - AC, DC, combined, rectified, with a variable speed drive, etc.

The device offers the following features:

Insulation resistance display (R)
Detection of insulation faults in accordance with a configurable threshold
Leakage capacitance display (C) with associated impedance (Zc) Applicable for IM400N*
Communication via the Modbus RS-485 protocol
Injection inhibition via logic input
Insulation fault log
Trending of the insulation resistance (R) from last hour to last year
Quick setup of the monitoring parameters according to the applications
Compatibility with voltage adaptor (Umax = 1,700 Vac Ph-Ph or Umax = 1,200 Vdc)
Compatibility with P1N ground adaptor and voltage transformer (Umax = 33 kVac) Applicable for IM400THRN*