Omron K7GE-MG User Manual page 35

 Megger Voltage
Generates a voltage of 50 VDC.
 Apply Megger Voltage
Turns ON the internal contact and applies Megger voltage to the load.
 Measurement
Measures the current flowing through the insulation resistance. Since Megger voltage is a known
value, the insulation resistance value can be calculated from the Megger voltage and the current
value.
 Current Limiter
If the load is turned ON when applying a Megger voltage, it is detected by the voltage monitoring
circuit and the measurement operation stops. However, due to a slight time lag, excessive current
flows between the charged sections of the load and the PE at the moment the load is turned ON.
The same thing happens when the insulation resistance value is extremely low even if the load is
properly turned OFF. To protect the load and the peripheral equipment, as well as the internal circuit
of the K7GE-MG from such an overcurrent, the K7GE-MG is equipped with a current limiter circuit
which limits the overcurrent.
Insulation Resistance Monitoring Device User's Manual (N224)
1 Overview
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