Mitsubishi Electric Melsec-Q172DCPU User Manual page 82

2 SYSTEM CONFIGURATION
POINTS
(Note-3): Allowable momentary power failure time
(1) For AC input power supply
• If the momentary power failure time is within 20ms, the system
detects an AC down and suspends the operation processing.
However, the system continues operations after the power comes
back.
• If the momentary power failure time exceeds 20ms, the system
either continues or initially starts the operations depending on the
power supply load. In case that the operation processing is
continued, the system operates the same as when the momentary
power failure time is within 20ms.
• When the AC supply of the AC input module is the same as that of
the power supply module, the connected sensor is prevented from
turning OFF due to the momentary power failure.
However, if only the power supply module and an AC input module
are connected on the AC line, detection of the AC down for the
power supply module may be delayed by the internal capacitor of
the AC input module. To prevent the detection of the AC down from
being delayed, connect a load of approx. 30mA per AC input
module on the AC line.
(2) For DC input power supply
• If the momentary power failure is within 10ms
detects a 24VDC down and suspends the operation processing.
However, the system continues operations after the power comes
back.
• If the momentary power failure time exceeds 20ms, the system
either continues or initially starts the operations depending on the
power supply load. In case that the operation processing is
continued, the system operates the same as when the momentary
power failure time is within 20ms.
(Note): This is for a 24VDC input. If the input is 24VDC or less, the
(Note-4): Inrush current
When power is switched on again immediately (within 5 seconds) after
power-off, an inrush current of more than the specified value (2ms or less)
may flow. Reapply power 5 seconds after power-off.
When selecting a fuse and breaker in the external circuit, take account of
the blow out, detection characteristics and above matters.
(Note-5): During the operation, do not allow the input voltage to change from
200VAC level (170 to 264VAC) to 100VAC level (85 to 132VAC).
If changed, the POWER LED turns OFF and the system operation stops.
(Note-6): Refer to "QCPU User's Manual (Hardware Design, Maintenance and
Inspection)" for details of the Q61P-D display status.
time will be 10ms or less.
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(Note)
, the system