Mitsubishi Electric Q172DCPU User Manual page 50

2 SYSTEM CONFIGURATION
POINTS
(Note-1) : Overcurrent protection
The overcurrent protection device shuts off the 5V, 24VDC circuit and
stops the system if the current flowing in the circuit exceeds the specified
value.
The LED of the power supply module is turned off or lights up in dim
green when voltage is lowered. If this device is activated, switch the
input power supply off and eliminate the cause such as insufficient
current capacity or short. Then, a few minutes later, switch it on to restart
the system.
The initial start for the system takes place when the current value
becomes normal.
(Note-2) : Overvoltage protection
The overvoltage protection device shuts off the 5VDC circuit and stops
the system if a voltage of 5.5VDC or more is applied to the circuit.
When this device is activated, the power supply module LED is switched
OFF.
If this happens, switch the input power OFF, then a few minutes later
ON. This causes the initial start for the system to take place. The power
supply module must be changed if the system is not booted and the LED
remains OFF.
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