Specifications - Mitsubishi Electric Q26UD(E)HCPU User Manual

7.2.2

Specifications

(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 turns off or turns on in dim green when
voltage is lowered. (As for the redundant power supply module, the LED turns off or turns on in red.) 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.
(2) Overvoltage protection
The overvoltage protection device shuts off the 5VDC circuit and stops the system if a voltage of 5.5VDC is
applied to the circuit. When this device is activated, the power supply module LED turns 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 (As for the
redundant power supply module, the LED turns on in red).
(3) Allowable momentary power failure time
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.
• Supplying the same amount of AC to both the power supply module and an AC input module (such as the
QX10) can prevent a connected sensor from being turned 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, an AC
down detection in the power supply module may be delayed due to the internal capacitor of the AC input
module.
To avoid this delaying, connect a load of approximately 30mA per AC input module on the AC line.
• During the system operation with two redundant power supply modules, the system does not initially start
operations when the momentary power failure of 20ms or longer occurs in one of the AC input power
supplies.
However, the system may initially start operations when the momentary power failure of 20ms or longer
occurs simultaneously in both AC input power supplies.
For DC input power supply
• If the momentary power failure time is within 10ms
operation processing. However, the system continues operations after the power comes back.
• If the momentary power failure time exceeds 10ms
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 10ms.
*1 This is the time when 24VDC is input. If the input is less than 24VDC, the time will be less than 10ms.
CHAPTER 7 POWER SUPPLY MODULE
*1
, the system detects a 24VDC down and suspends the
*1
, the system either continues or initially starts the
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