9
2. Function
2.1 Common characteristics (IR1570 and IR1575)
A-ISOMETER® for IT AC systems
(IT = unearthed systems)
DC measuring principle (IR1570 only)
Two separately adjustable ranges of the response value 2 kΩ…1 MΩ
(Alarm 1, Alarm 2)
Two-line LC display
Connection monitoring of the measuring leads to the IT system and to earth
Automatic device self-test
Option „W“:
This option provides: improved shock and vibration resistance for use in
ships, on rolling stock and in seismic environment
2.2 Additional characteristics IR1575
A-ISOMETER® for IT AC systems with galvanically connected rectifiers and for
IT DC systems and for IT DC systems
U
n
up to 480 V
Automatic adaptation to the existing system leakage capacitance
C
e
up to 60
µ
F
AMP measuring principle (European Patent: EP 0 654 673 B1)
2.3 Product description
The A-ISOMETER® type IR157x monitors the insulation resistance of IT systems.
IR1570 is suitable for use in 3(N)AC and AC systems, IR1575 is suitable
additionally also in DC systems. In AC systems, which are monitored by
IR1575, may include extensive DC supplied loads, such as rectifiers. The device
automatically adapts itself to the existing system leakage capacitance.
Summary of Contents for A-ISOMETER IR1570 Series
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