Mitsubishi A1SJH(S8) User Manual page 84

5. POWER SUPPLY MODULE
POINT
*1 Overcurrent protection
The overcurrent proctection device shuts off the 5VDC and/or 24VDC
circuit(s) and stops the system if the current exceeding the specified value
flows in the circuit(s).
As this results in voltage drop, the power supply module LED turns OFF or
is dimly ON.
After that, eliminate the causes of overcurrent, e.g., insufficient current
capacity and short-circuit, and then start the system.
When the current value has reached the normal value, the initial start up of
the system will be performed.
*2 Overvoltage protection
The overvoltage protection shuts off the 5VDC circuit and stops the system
if the overvoltage of 5.5 to 6.5V is applied to the circuit.
The power supply module LED turns OFF.
When restarting the system, power OFF and ON the input power supply,
and the initial start up of the system will be performed.If the system is not
booted and the LED remains off, this means that the power supply module
has to be replaced.
*3 Allowable momentary power failure period
The programmable controller CPU allowable momentary power failure
period varies with the power supply module used.
In case of the A1S63P power supply module, the allowable momentary
power failure period is defined as the time from when the primary side of
the stabilized power supply for supplying 24VDC to the A1S63P is turned
OFF until when the voltage (secondary side) has dropped from 24VDC to
the specified voltage (15.6VDC) or less.
*4 Inrush current
If power is reapplied immediately after power OFF (within 5 seconds), an
inrush current exceeding the specified value may flow (for 2ms or less).
Therefore, make sure to re-power ON the module 5seconds after power off.
When selecting a fuse or breaker for an external circuit, consider the above
as well as meltdown and detection characteristics.
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