Yaskawa YASNAC PC NC Connecting Manual - Manual (Page 45)

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YASNAC PCNC Connecting Manual Chapter 2: Power Supply
2.3.0 LED for PCNC Power input
The status of +24V power supply to the CNC unit can be confirmed by the LED.
The LED is lit when +24V power is supplied properly.
When +24V power is not supplied or when the fuse inside the PCNC unit is blown out due to a
fault of PCNC unit, the LED will be unlit.