A power fail monitor ( PEM ) is an Electronic Device used to accurate Monitor of input voltage and frequency and sense power failure in advance to cut – off machine Emergency hefore the actual power fails . This helps in limiting the travel distance of all axes especially Vertical axes in high speed Machining Centre during an unexpected Power Failure .

Use of Advance DSP controller helps in accurate measurement of linc Voltage and Frequency and sense Power Failure as fast of within 4ms this will avoid damage to Tool