Current Consumption Monitoring Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

28.5

Current Consumption Monitoring Function

This function monitors the current consumption value of an entire module and sends a notification if the threshold value of
current consumption is exceeded. If the current consumption does not drop below the threshold value for the certain amount
of time after the notification, this function stops the current that is supplied to USB ports in phases. Doing so can prevent the
power supply module from detecting overcurrent and stopping the power supply to the entire system.
Operation of the monitoring function
This function operates according to the following phases if it detects excessive current consumption by monitoring the current
consumption of a module.
Phase
Phase 1 The threshold value of a current
consumption error (warning) is
exceeded.
Phase 2 The threshold value of a current
consumption error (USB port
forced stop) is exceeded.
Phase 3 The threshold value of a current
consumption error (USB port
forced stop) is still exceeded
even after USB3.0 stops.
For details on the error codes, refer to the following:
Page 227 ERROR CODE LIST
If the current consumption value varies, the possibility that the threshold value of a current consumption error
(USB port forced stop) may be exceeded is notified. (In phase 1)
The following figure shows the operation when the threshold value of a current consumption error (USB port forced stop) is
still exceeded even after USB3.0 stops.
Current[A]
Notify that the threshold
value of the allowable
current consumption is
exceeded.
4.35A
4.17A
Current consumption
value
(Module itself + USB
devices)
USB3.0
USB2.0
(1) USB2.0 stops because the threshold value is still exceeded even after USB3.0 stops.
Operation of this product
USB port to be ERROR LED
stopped
N/A ON
USB3.0 ON
(USB connector (P1))
USB2.0 ON
(USB connectors (P2 to
P4))
USB3.0 stopped
Operating
Operating
OVERCURRENT
LED
ON
Slow flashing (at 1 sec
interval)
Flashing (200 ms
interval)
USB2.0 stopped
(1)
Threshold value of a current
consumption error (USB
port forced stop)
Threshold value of a current
consumption error (warning)
Time [sec]
Stopped
Stopped
28 SELF-DIAGNOSTICS FUNCTION
28.5 Current Consumption Monitoring Function
28
Error code to be
registered
1855H
1856H
1857H
211